using step up rings for filters

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Steve
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Hi. Ive got an 82mm 24-70mm lens and a 77mm 10-20mm lens, but no filters. Can I use step up/down rings so that I can buy just one filter and use it on both lenses? What kind of thing would I need - any recommendations? Or would I just be best buying separate filters for each lens? Many thanks
 
buy a step up adaptor like this and 82mm filters - the step up is fairly flat and shouldn't cause any worse vignetting problems than a 77mm on the 10-20mm - may be slightly noticeable on a deep section polariser at the extreme wide end, but you'd probably be having more problems with wierd polarising effects in the sky at that setting anyway.
 
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With a 24mm lens on a crop camera, I don't think you would have any vignetting problems fitting a 77mm filter with a step down ring.

I would phone SRB-Griturn and talk to them http://www.srb-griturn.com/82mm-lens-fitting-stepping-rings-148-p.asp I think they do a flat ring (ie one that doesn't stick out at all) with an 82 thread on the outside and 77 inside that could be permanently fitted to the 24-70 lens. Then get a 77mm lens cap to fit it.

It would be much better to standarise on 77mm and I think you could do that fine.
 
BEST option is to have a set of filters for each diameter but that's not going to be cheap! To keep costs down, get a set of filters for the largest diameter lens you have (or want to fit filters to) and use rings to fit them to smaller diameter lenses.

One downside to this is that bayonet fit lens hoods won't go over the larger filters so you may have to shoot without the hood. With a stack of filters, that can be asking for flare trouble.

Then there's the square filter system option. Can be cheap (Cokin) or expensive (Lee) and AFAIK, the systems are fairly interchangeable, so P size filters from Cokin will fit Lee holders and vice versa. These systems usually have their own hood system but stacking filters can still have a flarey effect unless you find some way to stop light getting between the filters and bouncing around.
 
Nod said:
BEST option is to have a set of filters for each diameter but that's not going to be cheap! To keep costs down, get a set of filters for the largest diameter lens you have (or want to fit filters to) and use rings to fit them to smaller diameter lenses.

One downside to this is that bayonet fit lens hoods won't go over the larger filters so you may have to shoot without the hood. With a stack of filters, that can be asking for flare trouble.

Then there's the square filter system option. Can be cheap (Cokin) or expensive (Lee) and AFAIK, the systems are fairly interchangeable, so P size filters from Cokin will fit Lee holders and vice versa. These systems usually have their own hood system but stacking filters can still have a flarey effect unless you find some way to stop light getting between the filters and bouncing around.
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Peter10d said:
Another thing to think about is from my experience, stepping rings can at times be a bit awkward to remove. At times I have found them to get almost stuck, but it may have been the cheap ones that I used.
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Fitting the right step-down ring gets around all these problems, as I mentioned above. You just don't need a filter as big as 82mm on a 24mm lens, even shooting full frame, and the OP has a cropper.

I can't see any reason not to standardise on 77mm in this instance.
 
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