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05-11-2010, 02:12 PM   #1
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62mm to 55mm affects image?

I want to buy a step down ring (62mm down to 55mm) to use my 55mm filters (UV, CPL and ND4) on my 62mm lens.

Will having a smaller opening/filter by 7mm affect the image in anyway, specifically is there a possibility of vignetting on a 70-300mm lens opened to 300, or on a 28-105mm opened to 105?

I'm thinking that with a smaller opening there might be a possibility of vignetting when zoomed all the way in.

05-11-2010, 02:24 PM   #2
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QuoteOriginally posted by KxBlaze Quote
I want to buy a step down ring (62mm down to 55mm) to use my 55mm filters (UV, CPL and ND4) on my 62mm lens.

Will having a smaller opening/filter by 7mm affect the image in anyway, specifically is there a possibility of vignetting on a 70-300mm lens opened to 300, or on a 28-105mm opened to 105?

I'm thinking that with a smaller opening there might be a possibility of vignetting when zoomed all the way in.
it depends on whetheher the lens was designed for aps-c and or 35mm film but this will be more noticible on wider angle lenses. for telephotos it will most likely result in darker overall images.
05-11-2010, 02:37 PM   #3
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QuoteOriginally posted by Lowell Goudge Quote
it depends on whetheher the lens was designed for aps-c and or 35mm film but this will be more noticible on wider angle lenses. for telephotos it will most likely result in darker overall images.
That makes sense that I might notice it on wider lenses but why would it make the overall images darker on a telephoto?
05-11-2010, 03:09 PM   #4
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QuoteOriginally posted by KxBlaze Quote
That makes sense that I might notice it on wider lenses but why would it make the overall images darker on a telephoto?
aperture (i.e.f-stop) = focal length / diameter

A reduced diameter over the front element acts just like a diaphram.

05-11-2010, 08:16 PM   #5
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Why don't you cut out a piece of cardboard to emulate a stop down ring and find out for sure?
05-11-2010, 08:59 PM   #6
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QuoteOriginally posted by Wheatfield Quote
Why don't you cut out a piece of cardboard to emulate a stop down ring and find out for sure?
Did not think about that. Good idea!
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