Step Down Rings

[Gianna'sPapa]

What is the maximum difference you can use a step down ring without seeing the edge of the adaptor? For example I have an 82mm lense and a 77mm polarizer filter. Can you use it without seeing the edge?

[MarkBarbieri]

What is the maximum difference you can use a step down ring without seeing the edge of the adaptor? For example I have an 82mm lense and a 77mm polarizer filter. Can you use it without seeing the edge?

0. You can use step up rings without a problem. Step down rings will pretty much always vignette unless the lens happens to have a much wider filter diameter than glass size. If you've got an 82mm lens, it's pretty certain that they are using all 82mm.

[Gianna'sPapa]

Thanks for the info. I was hoping to be able to get away with it, I just wasn't sure. When I bought my three new lenses, they included a set of 77mm filters with the 70-200. I knew it would work with the 67mm 28-70, just didn't know with the 82mm 100-300.

[boBQuincy]

0. You can use step up rings without a problem. Step down rings will pretty much always vignette unless the lens happens to have a much wider filter diameter than glass size. If you've got an 82mm lens, it's pretty certain that they are using all 82mm.

The exception to this might be when we are using a full-frame lens on a crop-sensor camera, then the full lens might not be used.

[Gianna'sPapa]

The Sigma 100-300mm f4 EX DG lens is a full frame lens and I'm using it on a Pentax K10D, which is obviously a crop sensor camera. With it only being 5mm diameter difference (82-77mm), do you think it will work?