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[Official] OCN Camera Thread - Page 942

post #9411 of 29551
Quote:
Originally Posted by mz-n10 View Post
Max sharpness is usually 2-3 stops from wide open. But anything pass f16 starts to get defraction
I've never really understood. How do you determine a full stop? As far as I know, it's double the amount of light/per stop.
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post #9412 of 29551
Quote:
Originally Posted by mz-n10 View Post
Max sharpness is usually 2-3 stops from wide open. But anything pass f16 starts to get defraction
Meh, it really depends on each individual lens/sensor combination. It depends on the diameter of the aperture and the size of each sensor 'pixel' - and f/5.6 is a much larger aperture at 800mm than at 50mm.

Quote:
Originally Posted by Shane1244 View Post
I've never really understood. How do you determine a full stop? As far as I know, it's double the amount of light/per stop.
f/1, f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22, f/32, f/45, f/64.....

Basically, you start with f/1 and f/1.4, and then every multiple of those (sometimes rounded) is a full stop.
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post #9413 of 29551
It's a scale...

f/1, 1.4, 2, 2.8, 4, 5.6, 8, etc.

I can't remember the exact pattern to how the numbers increase...

EDIT: Damn, Manyak beat me to it!
post #9414 of 29551
Quote:
Originally Posted by laboitenoire View Post
It's a scale...

f/1, 1.4, 2, 2.8, 4, 5.6, 8, etc.

I can't remember the exact pattern to how the numbers increase...

EDIT: Damn, Manyak beat me to it!
The exact pattern is on wikipedia

It's sqrt(2)^n, starting from from n=0.
Edited by Manyak - 11/28/10 at 1:39pm
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post #9415 of 29551
I was looking at this lens ( http://www.kenrockwell.com/nikon/18-105mm.htm ).

Look at the chart for Distortion. 35mm to 105mm more correction is needed. If this lens works on my D5000, will the "auto distortion correction" feature on my camera fix high distortion when using 35mm to 105mm?
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post #9416 of 29551
Rep to all thanks! I read a review, and apparently it's best is around f/3.5, I'll try that tomorrow, I'll also use a tripod.

Rep to all.
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post #9417 of 29551
I'm honestly not sure how effective auto distortion correction is on the D5000. However, in my very brief testing with my 18-55 VR and 70-300 VR it appears to work pretty well.
post #9418 of 29551
Quote:
Originally Posted by Unknownm View Post
I was looking at this lens ( http://www.kenrockwell.com/nikon/18-105mm.htm ).

Look at the chart for Distortion. 35mm to 105mm more correction is needed. If this lens works on my D5000, will the "auto distortion correction" feature on my camera fix high distortion when using 35mm to 105mm?
I dunno about in-camera, but lightroom should do it.
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post #9419 of 29551
Quote:
Originally Posted by laboitenoire View Post
I'm honestly not sure how effective auto distortion correction is on the D5000. However, in my very brief testing with my 18-55 VR and 70-300 VR it appears to work pretty well.
Do you think I should get that lens if it fits my camera?

I want good pictures but the fact that it needs to be corrected at high zoom puts me off

Quote:
Originally Posted by Manyak View Post
I dunno about in-camera, but lightroom should do it.
Yeah true. I guess i'll be relaying on lightroom
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post #9420 of 29551
Honestly, don't worry about the distortion. It's easy enough to correct either in camera or in post production. I've mentioned before that I'm not a big fan of the 18-105 (overpriced for what you get, in my opinion). However, if you think the range of focal lengths of the lens is what you're looking for, then go for it. Personally I'd either go for a 3rd party 17/18-50 f/2.8 zoom or the Nikon 16-85 VR before I bought the 18-105, but that's because I'd want my kit lens replacement to have better construction (the 18-105 still has a plastic bayonet mount).
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