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Spatial Resolution and its correlation to Dynamic Range - is there an apex?
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Apr 20, 2019 16:58:49   #
RichardTaylor Loc: Sydney, Australia
 
Chris T wrote:
I have, Richard … one at 12MP, two at 16MP, two at 18MP, one at 20MP, and the other half-dozen at 24MP.

But, my eyes are not so good, anymore … so, shots taken 8 years ago, with a 12MP camera - look pretty damned good to me, now … but, if I were to take some, now, with that camera - I doubt they'd be similar.

And, until I get my vision corrected - there's not much which can be gained, in doing tests, currently.
I have, Richard … one at 12MP, two at 16MP, two at... (show quote)


Get your eyes fixed, it will make a huge difference to your life, not to mention still allowing you to drive.
This is from very recent personal experience.

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Apr 20, 2019 17:01:02   #
BebuLamar
 
RichardTaylor wrote:
Get your eyes fixed, it will make a huge difference to your life, not to mention still allowing you to drive.
This is from very recent personal experience.


Don't worry Richard! Chris has the self driving car.

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Apr 20, 2019 17:46:38   #
Chris T Loc: from England across the pond to New England
 
R.G. wrote:
12.2MP. The A7S series have been notable for their exceptional low light capabilities, which I'm sure are due to the large photo sites combined with the latest sensor design. The new A7Siii promises to take that even further. My guess is that it won't depend on in-camera processing, so the benefits will be more substantial, and the high ISO performance claims will be more realistic.


Okay, then, RG - so, that's the one I'm interested in … it seems to be a very capable camera - achieving good Dynamic Range, plus superb low light capabilities - coupled with low res - which, presumably - means higher SPATIAL resolution, since there are LESS pixels, and those pixels are larger - which all will contribute to better performance, overall … when will the a7sIII be released, RG? … Do you know?

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Apr 20, 2019 17:51:17   #
Chris T Loc: from England across the pond to New England
 
RichardTaylor wrote:
Get your eyes fixed, it will make a huge difference to your life, not to mention still allowing you to drive.
This is from very recent personal experience.


Cataract surgery on my right eye - has already been scheduled, Richard … thanks … pre-check on Tuesday.

Will pick up some temp reading glasses, then, too - to replace the ones I bought in the Dollar Store ….

I have 20-40 right now … so, my left eye is pretty good … prescription glasses, at the moment - would provide 1.25x for the left eye, and 1.75x for the right eye - but I will hold off on that till AFTER surgery.

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Apr 20, 2019 17:55:37   #
Chris T Loc: from England across the pond to New England
 
BebuLamar wrote:
Don't worry Richard! Chris has the self driving car.


Not so, Bebu … I have to drive it - and hold the wheel with two hands, too - most of the time …

I don't really understand it, since most of the cars I've had before - held the wheel with one hand, easy.

But, maybe it's better this way - as I tend to concentrate more on my driving ….

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Apr 20, 2019 18:04:33   #
RichardTaylor Loc: Sydney, Australia
 
Chris T wrote:
Cataract surgery on my right eye - has already been scheduled, Richard … thanks … pre-check on Tuesday.

Will pick up some temp reading glasses, then, too - to replace the ones I bought in the Dollar Store ….

I have 20-40 right now … so, my left eye is pretty good … prescription glasses, at the moment - would provide 1.25x for the left eye, and 1.75x for the right eye - but I will hold off on that till AFTER surgery.


I've gone from driving glasses, reading glasses, and glasses when I use a computer - to no glasses at all after cateract surgery on both eyes.
The dioptre adjustment on my camera viewfinders need reseting back to zero (or there abouts.)

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Apr 20, 2019 18:05:12   #
selmslie Loc: Fernandina Beach, FL, USA
 
Chris T wrote:
... coupled with low res - which, presumably - means higher SPATIAL resolution, since there are LESS pixels, and those pixels are larger ...

No wonder you are confused!

Higher spatial resolution means more pixels. They are smaller.

Take some time to look up the terms. Then put your little gray cells to work.

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Apr 20, 2019 18:07:05   #
BebuLamar
 
Chris T wrote:
Not so, Bebu … I have to drive it - and hold the wheel with two hands, too - most of the time …

I don't really understand it, since most of the cars I've had before - held the wheel with one hand, easy.

But, maybe it's better this way - as I tend to concentrate more on my driving ….


While I like to use my camera in manual I would love to have a self driving car. Perhaps because the camera is my toy and the car is my tool.

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Apr 20, 2019 18:23:41   #
Chris T Loc: from England across the pond to New England
 
RichardTaylor wrote:
I've gone from driving glasses, reading glasses, and glasses when I use a computer - to no glasses at all after cateract surgery on both eyes.
The dioptre adjustment on my camera viewfinders need reseting back to zero (or there abouts.)


I've never touched any of those, Richard … they're all at the default setting, as far as I know …

I DO need reading glasses for the PC, and I'm told I should have prescription glasses for driving, and for reading … but the glasses I use on the PC - I can also use for reading … didn't know about needing glasses for driving, though - till a fortnight, ago … but, most of the time - I'm using sunglasses at the wheel - so that means - I'd need prescription sunglasses, and the Insurance Plan I'm on - only allows for one - so I have to decide whether prescription driving glasses are more important - or regular prescription glasses.

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Apr 20, 2019 18:28:17   #
Chris T Loc: from England across the pond to New England
 
BebuLamar wrote:
While I like to use my camera in manual I would love to have a self driving car. Perhaps because the camera is my toy and the car is my tool.


The ones that do that, now, though, Bebu - still need some kind of wheel control …

It'll be a while before cars are introduced which do it all, and I'm sure - there'll have to be special roads …

Kinda like the Bus Lane on the highway … another lane for self-driving cars …


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Apr 20, 2019 18:55:21   #
MrBob Loc: lookout Mtn. NE Alabama
 
Chris T wrote:
Jack … sorry, but you misinterpreted the premise, here - which focuses on SPATIAL resolution. You dropped it out in your initial thought, but then you put it back in - in your final thought - which amounts to a manipulation of the given premise …

However, if you take that - the given premise - out of the equation - then your comment makes sense - but only if the reference to SPATIAL is omitted in both parts of your comment. Incidentally, the Sony 12MP FF MILCs - come a lot closer to satisfying this commitment than do the 42MP ones ….
Jack … sorry, but you misinterpreted the premise, ... (show quote)


Come on Chris, essentially Jack is correct except for the fact he did not use the words " spatial resolution " in his comment to you... For all intent and purposes "Spatial Resolution " by def. is a measure of the SMALLEST object that can be resolved by the sensor; in our little world of digital photography would you not admit that the term that Jack used, resolution, is mostly interchangeable with spatial resolution ? Empirical evidence pretty much shows that higher Spatial resolution equates to higher dynamic range. High MP sensors in the 40 range can give us about 12-14 stops of dynamic range. I really fail to understand what you are trying to say. Here is one for you... peer into your crystal ball and speculate at the current rate of technology How soon will sensors be able to achieve a measure of about 20 stops as that is about what is equiv. to the range of the human eye ? This all sounds like a pretty academic topic to me and is not going to help me getting my ASS ( aggressive slider syndrome ), under control. BTW, do you like my new Acronym ? After shooting Velvia for so long my view of the world is still Super saturated and Vivid ! I am getting better though....

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Apr 21, 2019 04:36:50   #
R.G. Loc: Scotland
 
Chris T wrote:
… when will the a7sIII be released, RG? …


Rumours abound. Some say October, some say before that, some say not until before the Olympics in 2020.

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Apr 22, 2019 06:32:51   #
DavidPine Loc: Fredericksburg, TX
 
Chris T wrote:
David - you seem to have a REAL problem with my Topic Posts - don't you? … If that be the case - why do you even bother answering them? … Just to give me angst? … I told you, the last time you did this - I came up with the title myself - as is the case, with this one. I considered the problem long and hard - before I decided to put it into a title. I came up with this - believing some bright person here (and there are many) would come up with an answer which would mean something. Obviously - you're NOT one of them, David ….

BTW - if you want to see some of my work so badly - why don't you look for it in the Gallery? ...
David - you seem to have a REAL problem with my To... (show quote)


I have looked and no success. In less than 18 months you have in excess of 12,000 postings. If you have posted images that could be found or a web site we could view, and if your skill matches your persona, it might shut me up. I think you are a hack with visions not corresponding with your skill. I do have a problem with you in that respect. It's almost like you have attempted to hijack this site to feed your own ego. Please show us your work!

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Apr 22, 2019 08:55:36   #
BebuLamar
 
selmslie wrote:
Absolutely not! There is absolutely no [inverse] correlation at all.

Look at a comparison between the 2008 12.2 MP D700 and the 2017 46.75 MP D850. The D850 has nearly 4x the MP (2X the linear resolution) and far more dynamic range.

The difference? Nine more years of development.


Not even 9 year. Compare the DR of the D850 and D5 and the D850 has higher spatial resolution and higher dynamic range and it's only 1 and a half year newer and cost less.

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Apr 22, 2019 09:25:17   #
selmslie Loc: Fernandina Beach, FL, USA
 
DavidPine wrote:
I have looked and no success. In less than 18 months you have in excess of 12,000 postings. ...

It's hardly worth the search but I found three dog pictures from October 2017, ten flower pictures from January 2018 - all of them thumbnails, none of them remarkable in any way. There were a few more between those dates but they could have been taken better by a child with a smartphone.

It's more like 20 months of posting but that's still nearly 20 posts per day.

But that't not a record. Another member has managed nearly 80,000 posts in 79 months or 33 per day.

Why would anyone spend so much time posting?

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