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[Official] OCN Camera Thread - Page 1055

post #10541 of 29551
That's more than plenty then, I'll only need 2. Maybe less.
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post #10542 of 29551
Wow, I wouldn't have thought that much!
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post #10543 of 29551
Thread Starter 
Quote:
Originally Posted by ljason8eg View Post
Ok I'm about to pull the trigger on one of these telephoto lenses since I now have the funds, just need to make up my mind if I'd rather get IS, or a bigger aperture.

Amazon.com: Canon EF 70-200mm f/2.8L USM Telephoto Zoom Lens for Canon SLR Cameras: Camera & Photo
Amazon.com: Canon EF 70-200mm f/4 L IS USM Lens for Canon Digital SLR Cameras: Camera & Photo

I think it's been said well enough which would be better, but the f/4 IS does have the Mode 2 stabilization which is specifically for panning (only stablizes one direction, horizontal or vertical depending on which direction you're panning).

The other thing to note, which isn't that big a of deal really, but the the f2.8 it much heavier (twice as heavy) and wider than the f/4.

Note they don't have to be from amazon, and I'm open to a third party lens in the same price range, but I'd like to buy it new unless I can get a really nice deal on a used one.

This will mostly be used for motorsport since I've acquired a media credential and a few teams have expressed interest in me photographing their cars in action. I'm thinking the IS would be rather useless at shutter speeds of 1/640 or above, and I'd get more use out of the larger aperture.

Thoughts?
Quote:
Originally Posted by theCanadian View Post
How many stops can that underexpose in RAW, correct in Lightroom trick be used for? I might need to use it tonight.
Like mz, I can underexpose by quite a bit and get acceptable results. It's so effective that I never need to combine exposures or do HDRs anymore. The only thing to worry about (especially with crop sensors) is that noise can increase dramatically when lifting shadows.
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post #10544 of 29551
yeah, there's no way boosting that much exposure would result in a printable photo.
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post #10545 of 29551
Thread Starter 
Quote:
Originally Posted by Shane1244 View Post
yeah, there's no way boosting that much exposure would result in a printable photo.
Yeah, because there's not only noise, but really bad banding. But you have more headroom with FF. In the photo below, the original was metered off the sky through the opening, and the interior was completely pitch black. However, I was able to somewhat balance the exposure by using dodge/burn brush in LR3:


Old Airdrie Iron Furnace by gonetomorrow00, on Flickr
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post #10546 of 29551
Wow, That's pretty amazing! Any idea on the reasoning behind the FF being able to do it better? Is it just because the initial quality is greater?
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post #10547 of 29551
Thread Starter 
Quote:
Originally Posted by Shane1244 View Post
Wow, That's pretty amazing! Any idea on the reasoning behind the FF being able to do it better? Is it just because the initial quality is greater?
Full-frame sensors have lower pixel density, resulting in larger photosites which are able to gather a larger range of light. How of a range a sensor can capture is called its dynamic range. Full-frame has more DR than APS-C, and medium format sensors have even more, and film trumps them all.

This article explains it better than I can:

http://www.cambridgeincolour.com/tut...ensor-size.htm
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post #10548 of 29551
My experience has been the opposite regarding DR. Digital more apparent or usable DR due to the granular control RAW converters. Pushing film isn't a very accurate process and introduce uncontrollable contrast and grain. In RAW, you can apply whatever tone curve you want as well as exposure, fil light, black level, white level, local and global contrast.

This only applies mostly to negative film. For positive slides, forget it - 1/2 to 1 stop off and you're done.

I agree with larger digital sensors having more DR, however.
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post #10549 of 29551
Hm, I've never really tried underexposing then doing all the good stuff in post. Never really needed to, but now I know I can do it quite well in an emergency.
post #10550 of 29551
Sharp vs Aliased.
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