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PLEEEASE help me figure out what mm means on lens!
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Nov 13, 2011 22:29:56   #
gessman Loc: Colorado
 
English_Wolf wrote:
I hope I did make too many spelling mistakes or grammar errors this time!!! :oops: :shock:


Well, you did but we're just glad you didn't take any chunks out of us with them teeth you got there. :-)

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Nov 13, 2011 22:49:59   #
English_Wolf Loc: Near Pensacola, FL
 
Ronny wrote:
Sure people in the sciences and engineering use metric but just because Europe does it doesn't mean we have to. The old system works fine and even in Europe they will use a mix of both. E.g. England uses miles instead of kilometers.

Your old fine system is only used in this fine country. The rest of the world use metric SI standard.
Question: How do you teach a kid using his 10 fingers to count to 12 inches in a ft? As one of you already marked up, this country is loosing a lot of engineering projects in the world. And in the old days they were the leaders. I have learned a lot from some American master engineering designers. Big companies like Bechtel, Fluor and Parsons have laid off thousands of good guys.
Sure people in the sciences and engineering use me... (show quote)


Wrong, they use what is called the 'imperial system' that is REALLY nuts. They adopted the metric system about 20 years ago and took their time changing their signalization on their roads (often in both measures)

http://en.wikipedia.org/wiki/Imperial_units :shock: :mrgreen:

Yeah, I am :evil:

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Nov 13, 2011 22:58:15   #
Doublekk Loc: PA
 
I'm newer than you. I knew that mm meant millimeter because I'm a nurse. Thanks for asking that question, I learned a lot from all the answers. :thumbup:

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Nov 14, 2011 02:07:06   #
Danilo Loc: Las Vegas
 
RIGHT ON marcomarks! Great advise!
It's a rare individual who can "buy" their way to better photography.
Years ago, my brother-in-law took a photo of Lake Michigan with a Kodak Instamatic X-15 ($20) on Verichrome Pan B&W film. I took his neg into the darkroom and did some magic and he won the local camera shop's monthly contest. All the Leica, Nikon, Hasselblad, etc. owners entered in the contest were PO'd, but THEY were all the ones who voted on the pictures!

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Nov 14, 2011 11:33:18   #
Ronny Loc: Netherlands
 
English_Wolf wrote:
Ronny wrote:
Sure people in the sciences and engineering use metric but just because Europe does it doesn't mean we have to. The old system works fine and even in Europe they will use a mix of both. E.g. England uses miles instead of kilometers.

Your old fine system is only used in this fine country. The rest of the world use metric SI standard.
Question: How do you teach a kid using his 10 fingers to count to 12 inches in a ft? As one of you already marked up, this country is loosing a lot of engineering projects in the world. And in the old days they were the leaders. I have learned a lot from some American master engineering designers. Big companies like Bechtel, Fluor and Parsons have laid off thousands of good guys.
Sure people in the sciences and engineering use me... (show quote)


Wrong, they use what is called the 'imperial system' that is REALLY nuts. They adopted the metric system about 20 years ago and took their time changing their signalization on their roads (often in both measures)

http://en.wikipedia.org/wiki/Imperial_units :shock: :mrgreen:

Yeah, I am :evil:
quote=Ronny Sure people in the sciences and engin... (show quote)


The first lines were not mine.
Please check!

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Nov 14, 2011 11:38:52   #
English_Wolf Loc: Near Pensacola, FL
 
Ronny wrote:
English_Wolf wrote:
Ronny wrote:
Sure people in the sciences and engineering use metric but just because Europe does it doesn't mean we have to. The old system works fine and even in Europe they will use a mix of both. E.g. England uses miles instead of kilometers.

Your old fine system is only used in this fine country. The rest of the world use metric SI standard.
Question: How do you teach a kid using his 10 fingers to count to 12 inches in a ft? As one of you already marked up, this country is loosing a lot of engineering projects in the world. And in the old days they were the leaders. I have learned a lot from some American master engineering designers. Big companies like Bechtel, Fluor and Parsons have laid off thousands of good guys.
Sure people in the sciences and engineering use me... (show quote)


Wrong, they use what is called the 'imperial system' that is REALLY nuts. They adopted the metric system about 20 years ago and took their time changing their signalization on their roads (often in both measures)

http://en.wikipedia.org/wiki/Imperial_units :shock: :mrgreen:

Yeah, I am :evil:
quote=Ronny Sure people in the sciences and engin... (show quote)


The first lines were not mine.
Please check!
quote=English_Wolf quote=Ronny Sure people in th... (show quote)


Right, I apologize.

Reply
Nov 17, 2011 15:11:26   #
ThePapaJohn Loc: All over the world.. Currently WA
 
And back to the subject of helping....

Great video about "Why are my pictures not sharp" which is, from what I'm guessing your having problems with, would be answered...

http://www.phototips.biz/2011/11/how-to-take-sharp-pictures-top-10.html

Hope this helps some for you..

John

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Nov 17, 2011 16:15:20   #
BanjoBob Loc: Kansas
 
I see the MM question has been thoroughly explained.
The question about the extreme differences between the prices of identical MM lenses is about quality.
A very pricey lens will have a higher quality of lens body materials used, number of aperature blades and better glass. These determine clarity, longevity and the seemingly very important Bokeh.
Bokeh is Japanese for blur.
When tightly focusing on a subject it is considered very good Bokeh for the subject to be very well focused while other things on the image are blurred.
When it comes to blur, some can be distracting and some is a welcome feature which complements the sharp in-focus subject of the picture.
An inexpensive lens will show some dots of light which will have a hexagon shape due to the blades of the aperature in the lens, while a more expensive lens will have a greater number of blades which makes the dots of blurred light appear to be more round.
That's my understanding, but I know very little other than if you can afford the pricier lens, in time you will appreciate it much more than the less expensive lens.
I'm sure there are experts here who will disagree, because I too am a beginner.

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Dec 3, 2011 19:24:38   #
cgchief Loc: Jarrettsville
 
tumbleweedprimitives wrote:
Hello!
I really hope someone can help me with this. I'm new to photography and I have a Canon 1000d. I have the lens that comes with the kit and I bought a lens 55-250mm. its ok but I want to get one that zooms more and takes better pictures at night. this one takes action pictures but MANY are blurry. I have been "trying" to understand the difference between lenses cause I may sell the 55-250 in order to get a better zoom one. But, I have NO IDEA what those numbers mean and every website i go to talks about the focal length between this and that....for a person just starting out...this is chinese! I JUST got the hang of aperture and shutter speed...can anyone help me understand what it means? I see lenses 70-300mm that cost $2000.00 and I'll see another lens also 70-300mm for $600.00 whats the difference? this has been frustrating me for a while and what better place to get help than here. ANY ANY clearing up would be so appreciated! thank you :-)
Hello! br I really hope someone can help me with t... (show quote)

Here is what mm means; 25.4 milimeters=1 inch.
Shoot some pictures with present equipment and read the manual. Do some research before spending the big bucks.

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Dec 3, 2011 19:43:25   #
cgchief Loc: Jarrettsville
 
gessman wrote:
photojim wrote:
JimH wrote:
gessman wrote:
1.) I have long been under the impression that "mm" stands for "millimeter" and it takes 10 to make a centimeter which takes 10 to make a meter, etc.
Well, almost. A Meter is 100 centimeters. (Hint: the centi- kinda gives it away...)

Go Broncos! (beat KC, anyway...lol)


Your corrct of course. Millimeter, a 50 or 55mm lens is standard on a 35mm film amera. 25mm is about an inch and 55 mm about 2 inches. I t always suprised me that a country like United States never adopted metric standard altough IT IS the official standard in the USA. If your an engineer or metal worker, Metric is the world wide standard and I believe is one of the reasons we don't do so good in selling engineering to the rest of the world.

Ian
quote=JimH quote=gessman 1.) I have long been u... (show quote)


I frankly never even considered what was meant by the "mm" as in 50mm lens but obviously others do. So, perhaps you can tell me then, from inside the camera with what we have called the "film plane," marked by that circle with a line through it on a film camera, what exactly is it that is 50mm from there? It wouldn't be the front lens element because that idea would break down when it came to a 70-200mm zoom where the front lens element always stays the same distance from the film plane. It would seem as though it would have to be some internal lens element that moves closer and further from the film plane??? What say you?
quote=photojim quote=JimH quote=gessman 1.) I ... (show quote)

The 'film plane' mark indicates the location of the film and you measure from that point to the subject you plan to photograph if there is need to be more precise than your
viewer or rangefinder markings.

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May 23, 2012 22:36:31   #
susiescue Loc: Seattle Wa
 
That was awesome!!!!

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