Photography fans, one quick question - Democratic Underground

Deja Q

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Fri May-14-04 01:43 PM
Original message

Photography fans, one quick question

I've been trying out my new 600-1000mm zoom lens.

I haven't taken any snaps yet, but I'm wondering: At 1000mm, as one looks away from the center of the lens, the image becomes distinctively darker as it approaches the viewfinder's corners.

Will this effect show up on the film? Or is this a typical problem with larger zoom lenses in regards to the viewfinder mechanism?

Thx!

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TrogL

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Fri May-14-04 01:53 PM
Response to Original message

1. Known bug in long lenses

Presumably you're using an SLR. What you see is what you get.

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Doctor Smith

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Fri May-14-04 01:59 PM
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2. Yes, at larger apertures, but not so much at smaller ones.

Edited on Fri May-14-04 02:13 PM by Doctor Smith

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Westegg

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Fri May-14-04 02:15 PM
Response to Reply #2

3. Yo, Doc, sounds like you know your stuff. So, a question:

What's the longest lens that DOESN'T involve this problem? I'm thinking of buying a telephoto myself. Also, is this problem worse with zooms? And is it more pronounced with, say, a more generic lens compared to a top-of-the line (ultra-expensive) Nikon lens?

Sorry. That's 3 questions!

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Deja Q

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Fri May-14-04 02:31 PM
Response to Reply #3

4. Light falloff

I discovered it's a natural tradeoff, particularly with longer lenses. :-(

It shows up worse in pics that would otherwise have an even brightness.

I've noticed that anything beyond 700mm starts this problem, but becomes rather pronounced at 900mm and rather annoying at 1000mm.

There are filters made that can compensate this, but they cost $300 or more.

A lens made to circumvent this problem would be very big and costly too. :-( Not really meant for 35mm photography I suppose...

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Doctor Smith

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Fri May-14-04 03:25 PM
Response to Reply #3

5. It depends on the lens

All lenses have some falloff. Generally, a bigger, more expensive lens, with more glass will have less falloff, and will also be heavier. Zooms will generally be worse.

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