62mm to 55mm affects image?

KxBlaze · 05-11-2010, 02:12 PM

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.

**Lowell Goudge** · 05-11-2010, 02:24 PM

Originally posted by KxBlaze

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.

KxBlaze · 05-11-2010, 02:37 PM

Originally posted by Lowell Goudge

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?

**Lowell Goudge** · 05-11-2010, 03:09 PM

Originally posted by KxBlaze

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.

Wheatfield · 05-11-2010, 08:16 PM

Why don't you cut out a piece of cardboard to emulate a stop down ring and find out for sure?

KxBlaze · 05-11-2010, 08:59 PM

Originally posted by Wheatfield

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!

05-11-2010, 02:12 PM	#1
KxBlaze Veteran Member Join Date: Feb 2010 Location: California Photos: Gallery Posts: 1,602	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.

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05-11-2010, 02:24 PM	#2
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,891	Originally posted by KxBlaze 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
KxBlaze Veteran Member Join Date: Feb 2010 Location: California Photos: Gallery Posts: 1,602 Original Poster	Originally posted by Lowell Goudge 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
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,891	Originally posted by KxBlaze 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
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,986	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
KxBlaze Veteran Member Join Date: Feb 2010 Location: California Photos: Gallery Posts: 1,602 Original Poster	Originally posted by Wheatfield 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!