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Oct 18, 2020 09:00:22   #
GerryER wrote:
If "art" is your goal, then there are techniques to optimize your expression. If the science and accurate reproduction of an object or scene is your goal, there are techniques to optimize that. Neither is "right or wrong;" it depends on your goal. Unfortunately, there is no way to tag a picture as art or accurate reproduction, expect by noting the type of processing, if any, that was done. Many people do not indicate that post processing was done, though on many photos it is quite obvious, so you don't really know if the person is a good artist or good photographer, or both, or neither. It would be interesting to have a photo contest where no post, or in-camera, processing is permitted to see what people really can do with a camera. Just a thought.
If "art" is your goal, then there are te... (show quote)


You wouldn't have much of a photo without some processing, each pixel records light round a particular frequency commonly known as red green or blue. So at the very least each pixel requires interpolation of the data from its neighbouring pixels as each pixel is missing around 2 thirds of the color data. There will be adjustments applied at least some contrast and some stylistic choice. So you are asking the impossible really there is always postprocessing Automatic or automatic with some manual input.
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Oct 15, 2020 23:23:29   #
couch coyote wrote:
Nice photos, and I bet it was an even nicer experience. What a great place for a walk. Thanks for taking us along!


The daft thing is I moved into the village about 3 months ago and have been in to Doneraile park about 2 or 3 times since then. There is a gate less than 5 minutes from my door which also brings you in at the top of the hill by the main house and café.

I guess its true you rarely visit the features near your home unless you have visitors from out of town. The current lockdown measures here are limiting home visitors to 1 or is it none now. So it's a good place to mooch round without getting into crowds.

I'm tempted to do a photo essay on people and their masks maybe it will be a good thing to have a record of these strange times.
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Oct 15, 2020 18:08:53   #
Hi today was bright and sunny so i decided to walk over the road and have a play with my panasonic GX85 a small cheap mirrrorless with an even cheaper 14-42mm lens. Dynamic range was a bit of a problem but I enjoyed my walk.


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Sep 17, 2020 21:23:10   #
Dngallagher wrote:
Just picked up an $80.00 X Touch Mini from Behringer - Midi2lr free software. Configured and works well. I am starting to get slight tremors in my right hand at times working my mouse, and it often makes working with sliders with a mouse difficult for me. No problems with buttons or knobs though.

https://www.uglyhedgehog.com/t-664333-1.html#11564904


you might find some software called 'Touch Portal' useful pretty much makes custom buttons for doing most things using ios or android device on a PC or Mac you can have several commands on a single button. There is a free version but its limited on buttonsbut enough to see if its something you would use.
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Aug 30, 2020 21:33:35   #
It really can do a lot, say you need a calculator you can set a button to start the application lets say you want to convert say pounds to kilos you can create a button with the conversion factor on it. press that and then do the sum. limits really mostly your imagination.
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Aug 30, 2020 03:37:53   #
User ID wrote:
Diopter spec of any lens is the inverse of its FL (FL stated in meters). So a one meter lens is a one diopter lens. A two meter lens is half diopter lens. A half meter lens is a two diopter lens.

Diopter specs are additive. Thaz why diopter spec is more convenient than FL spec when combining lenses. Combine lenses of half diopter and one diopter and you have a 1.50 diopter lens, which acoarst has a FL of 1/1.50 meters which solves to 0.66666 meters.

Your camera lens in question thus has a diopter spec of 1/0.135 diopters which solves to 7.41 diopters. Combine a two diopter lens with that and you have a 9.41 diopter combined lens whose FL is 1/9.41 meters which solves to 0.106 meters.

Now you know why combining a “2 diopter” lens with “135mm” lens creates a “106mm” lens that focuses closer than the “135” did on its own. The lens barrel was built for 135 tele but is now carrying a 106 tele. The barrel puts the 106 tele 19mm beyond its infinity focus distance from the sensor. In effect you have a 106 at its infinity focus connected to a 29mm extension tube. Thaz why it’s focused to a subject distance of one half meter ... the extension tube.

By the same formula, a 3 diopter “CU lens” will produce a 10.41 diopter combined optic which is a FL of 93mm so your excess barrel extension is 42mm. The result will be approximately 1:2 image size. Your defacto “extension tube” is about half of your FL (93mm) which gets you “half life size”. Since 42 is not quite half the FL, just turn the focusing ring away from the infinity mark to get a bit closer.

But if you need 1:1 image size, you need to shorten the original 135 tele to waaaaaay shorter than 106mm. Conveniently, a 1:1 image size occurs when any lens is at “double extension” vs it’s infinity focus position. IOW you’re stuck with a lens barrel that provides an extension of 135mm, so you must alter the optics to a FL of 67.5mm which is better stated as 0.0675 meters, which is 1/0.0675 diopters. Ain’t that peachy ?

1/0.0675 = 14.8 (diopters). The original “135 tele” has a diopter spec of 7.4 so it needs a 7.4 diopter optic combined to it to reach 14.8 diopters. Thaz the whole set of three “CU lenses”, the +1, +2, +4 set which is optical hell. Maybe you can find a +7.4 “CU lens” somewhere ... rotsa ruck widdat. Didja notice that archive 1:1 (at inf’y position) the additional optics have the same FL as the original lens ? That acoarst is scalable.

Scaling away ... where’s your 0.30 meter tele ? You call it “my 300”. We can also call it your 3.33 diopter tele. So if you hang a +3.33 “CU lens” on it you have 150mm combined optic at double extension (300mm from the sensor) and acoarst since at 1:1 everything is symmetrical, the lens is equidistant from both the sensor and the subject. IOW the subject is 600mm from the sensor. If you can’t find a +3.33 “CU lens” just use a +3. You can move the focus ring off its infinity mark to get a bit closer.
Diopter spec of any lens is the inverse of its FL ... (show quote)


beautiful but is it missing the native lens magnification?
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Aug 29, 2020 23:08:22   #
Touch Portal
is some interesting software that works with android and ios devices to control PC's and Macs, by using the tablet or phone as an input device for your computer. The free version limits you to 2 pages with a maximum of 11 by 10 (110 buttons per page) or 220 buttons. The pro version supports plug in modules and unlimited modules. The tablet acts as a Gui for actions which are received by the computer over wifi, they need to be on the same network.

Most programs have keyboard shortcuts and a button can be a keyboard shortcut, some keyboard shortcuts are os level and some application specific. A button can be a series of commands which are executed in order.
When you first install touch portal it has just 4 buttons on the main page and there are a number of pages which you can download and import into touch portal some are free some you pay for at a reasonable cost. Some programs have 100's of keyboard shortcuts and mapping them into a custom page can be a lot of work, which may make paying for a page worth it to you. There are pages for lightroom, photoshop and many others premade. All the functionality is on the host pc the tablet receives the pages from the host and sends back the press to the host.

There is way more functionality than i can put in a single post but i will give you a few basic ideas.
you can launch an application and give it an argument. So you might use a button to open excel with a specific spread sheet. It can also open url's in your web browser. So you might have a button to open a page on uglyhedgehog.com and maybe others to open specific sections.

The application launch is quite interesting for example a button to open lightroom will either launch lightroom or bring it into focus if it is already running. As buttons can contain a stack of commands you can also add a command to switch to a different page. E.g with the lightroom launch button you can switch to a page of lightroom specific buttons with a single button press. So your main page may be application launchers with subpages for individual applications. With lightroom there are different modules Library , develop, print ect so you can have a page for each module and specific buttons for that module. You can create more generic buttons such as cmd W this closes a tab in a web browser but it can also close an application e.g lightroom if it has focus. Buttons can be text only colored or have an image which is a 256x256.png file. if you export a page it creates a zip file with icon images and a text file for the defined functions. This is mostly used for sharing pages with other people but you can use it to import to another computer. You can also cut and paste buttons between pages, the editor is pretty straight forward. Commands are grouped logically into sections and plugins create a new section when they are imported.

A plugin might allow you to run say some applescript to tell an application to do something. It really is quite open ended. The possibilities are mainly limited by the program you are using if you can't use a control other than by using a mouse you can't create a button for it.

So basically it allows you to create shortcuts to make things easier and faster. You don't have to remember the keyboard shortcut to activate a particular action as you can have a button available for the context you are using touch portal.
You can create macro functions in touch portal or trigger a macro within a program.
If you don't want to create your own buttons there are pages created already and if you don't need some of the functions you can customise the pages to just what you want. It's a lot simpler to use than explain to be fair.

The only thing which was confusing when i imported the free page for lightroom was how to make it active. Each page has a name and you need to create a navigation button on main to switch to that page. The mobile app is available in the ios and android stores and the host program can be downloaded on the touch portal website. The pro version is an in app purchase. You can use the mobile apps on macs and pc's, that is you can use an ios device on a PC not just a Mac same with Android devices.

Hope you found this interesting, it's a great tool for simplifying your interactions with the computer.

You can find reviews on touch portal on youtube.
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Aug 29, 2020 08:43:06   #
lamiaceae wrote:
I have actual Macro lenses but the question concerns a special use of diopter rated filters. Say I have a 135mm lens, what diopter filter, say +1, +2, +3, etc. do I need to double the magnification or half it's working distance? I know 1 diopter means a focal length of 1000mm, but how do I use that fact? Since my lens has a 67mm front size I would rather but just one correct filter for my needs than the usual set of three filters, 1, 2, 4 or 1, 2, 3. Or to be able to shoot the 135mm at 1:1?

The explanations I read online mainly define what diopter values are but not how to use them for a use.
I have actual Macro lenses but the question concer... (show quote)


They are kinda like reading glasses a 1 diopter has a maximum focus distance of 1 meter a 2 is 1/2 meter a 3 is 1/3 (33cm) 1/4 25cm a 1/2 diopter would be 2 Meters and rare there is another kind of half diopter which is a half a diopter lenses. giving two planes of focus it can tricky to hide the join.
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Jul 5, 2020 06:50:02   #
graybeard wrote:
I took a long hard look at things today and am determined to get at the bottom of it. First, I have a Mamiya/Sekor 1.4 and a Pentagon 1.8 which both have M/A slider switches and a related pin on the base. Then I have a Sakar 3.5 zoom that does NOT have a slider, but does have a pin. Then I have an Industar 3.5 that doesn't have a slider or a pin! Second, I have M42-EOS adapters that are either flanged and chipped, or flanged and unchipped, or unflanged but chipped! So, lots of combinations. The flange on the adapter pushes in the pin and makes the slider, if present, irrelevant. But if unflanged, the pin is unaffected. The for sure wrong combo is unflanged with slider on A. With that combo the iris does not move when the aperture ring is adjusted. The chips "communicate" to the camera, just what they communicate is not clear to me. But I will learn this, starting with this flange/pin and the lens aperture ring closing down the iris (or not) depending on the various slider/pin/flange combinations.
I took a long hard look at things today and am det... (show quote)


The chipped adapters will report lens details usually it's a 50mm you can see this in the exif information of a photo as well as the f-stop used. On the camera body you should be able to adjust the F-stop readout but it only causes problems unless you calculate the shutter speed yourself. Have a look at the exif and see what the camera thinks is happening.
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Jul 1, 2020 17:13:16   #
User ID wrote:
Some m42 adapters have the Pin Depressor Flange and some do not.

I use both types. Those WITH the flange will handle all m42 lenses in the normally expected manner, whether or not the lens has an A-M switch. It won’t matter which way the switch is set.

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There is only one good reason to prefer m42 adapters LACKING the flange. For those m42 lenses having a sturdy and convenient A-M switch you can enjoy the A-M switch as a Focus-Shoot switch. “A” opens the iris for accurate focus and “M” closes the iris to whatever stop you’ve set on the aperture control ring, to shoot at the desired f/stop.

Seems clear that the gross overexposure experienced by the OP is caused by using an adapter that allows this Focus-Shoot switching convenience. Leaving the switch in Focus mode leaves the iris wide open regardless of the setting on the aperture control ring.
Some m42 adapters have the Pin Depressor Flange an... (show quote)


If you are not stopping down and shooting wide open, the F-stop will be wrong but it shouldnt effect the exposure.

Canon will meter wide open in aperture priority mode if you close up the aperture some , it just sees a darker day. Where you go wrong is telling the camera the f-stop you are actually using. if the lens is saying its F1.4 50mm then if you tell it you are using f2 it expects light to be half what it measured wide open and adjusts the shutter speed to suit. Do not tell the camera its f-stop is anything other than wide open and it will expose for the light it is measuring "wide open". Doesn't matter what the real aperture is. With some lenses you have a fully variable aperture more often than not I will monitor the shutter speed as I stop down and ensure it is fast enough for the lens I am using.
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Jun 30, 2020 13:45:25   #
JimH123 wrote:
Well, I never knew that there were versions that removed the M-A slider switch. I remember the one I once had did have the slider switch which I bought new in 1969.

I guess for adapted lens use, the aperture plunger on the lens needs to be taped down making it a manual lens again.


On the Canon adapters there is usually an internal lip and when you screw down the lens the lip pushes in the pin, alternatively if you careful you can remove the back plate and access the pin a little bit of a biro refill will slip over the pin and when you put it back together it holds the pin in.
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Jun 30, 2020 01:08:58   #
It kinda depends on the adapter, it probably reports a max aperture. Eg f1.4 set the camera in aperture priority mode adjust the focus and then stop down to what you want but don't tell the camera this just let it think that the camera lens is wide open at the e.g f1.4 now it will base the exposure on the available light which depends on where you have the aperture set.

Focus at wide open this minimises the depth of field and helps the camera see the maximum contrast where you are focusing.
Why you set the maximum aperture reported by the adapter is that the camera expects the aperture to close down which it won't so say it reads the exposure and calculates say 1/200th of a second if you are telling it you are using f2.8 it says 1/200 wide open so 1/50 stopped down 2 stops. The result an over exposure by 2 stops.

In manual mode you can just work out the values yourself and set an aperture shutter speed and iso then its all your fault. Even then you can take a test shot look at the histogram if its too far left then you need a longer shutter speed to far right a slower shutter speed. Aperture priority is easiest.
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Mar 30, 2020 11:42:20   #
buckbrush wrote:
Blackest, you bring up a good point and the answer is 'it depends on where you live'. Here in the country with little heavy population density it is very easy to keep at least 2 meters away from others. I find people also keep that far away from me as a matter of basic courtesy.

Unfortunately, when I am forced to use a public restroom, due to having prostrate cancer about 15 years ago and the radiation caused my bladder to lose its flexibility. The need to use the bathroom comes upon me suddenly and in a very painful way.

Something i never thought I'd ever have to explain but it may help you understand why some people still go about their limited activities if it does not affect anyone else.
Blackest, you bring up a good point and the answer... (show quote)


I think it's fair to say , your health isn't the best, so you really shouldn't be risking your life, you could pick up covid 19 on all manner of surfaces even if the hand dryer is not a risk. At the moment here in ireland there are just 5 recovered and about 45 dead from Covid 19 Thats an insane 90% death rate. Two of them were Doctors, it is concerning there are so few recovered patients at this stage.

I think the way things are going you might be able to go back out in the 2nd week in june.
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Mar 29, 2020 15:12:02   #
Gentlemen may I kindly ask you wtf you are doing in a public bathroom?
You are supposed to be at home keeping away from people who are likely infected.

If you are following the rules, hand dryers are not a problem.
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Mar 29, 2020 12:39:48   #
Rongnongno wrote:
Personal understanding:
Is the risk of infection serious? Yes.
Is this hyped too much? Yes. This leads to panic.
Is there a need to panic? No.
Is there a need to stock up? No, mitigated by folks who panic buy and create a situation of apparent penury. So far my wife and I have not felt the impact because we go to stores at the right time and get what we need in time.

Medical:
Short supplies of masks and other consumables are due to panic more than anything.
Respirators are in short supply. This could be mitigated if and only the Gvt orders companies to produce them, so far, nothing. Yes it is a criticism.
Vaccination will come in time, not soon enough for many but it will come. Trust the scientists and researchers instead of bashing them.

Political:
The reaction to the virus depends not on the humanity of a person but on the political leanings. THAT IS SHAMEFUL.
Bail out is the most infuriating senseless step taken by the Gvt. Folks need help, not corporations. Folks include all the small businesses that employ only a few people. These, despite the appearance are not covered or helped at all.

Examples to recognize:
Some individuals took step to help like the billionaire in Detroit that suspended all rents in his buildings until the crisis is over.
A few banks also are taking steps to prevent further deterioration by stopping eviction procedure and interest payments for the duration.

People to recognize and support at all cost:
Healthcare professionals
Emergency services workers
Police in the street
Military deployed to help
I am sure my list is too short.
b Personal understanding: /b br Is the risk of i... (show quote)


I would include the people who help bring us food especially the shop workers, most of us can limit interaction with other people but they get to be exposed to everyone and the ugly side of humanity.

I guess i'm lucky to be an essential worker that can mostly work from home.
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