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Adapting the Sigma 15-30 to use 122mm filters?

LightMeter

Houston, Texas, US
1026 posts

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LightMeter Silver Member Nikonian since 29th Oct 2011
Fri 28-Jun-13 01:21 AM | edited Fri 28-Jun-13 01:22 AM by LightMeter

I just thought of this at work today. Thinking of making a piece out of aluminum that will slide on to the built in hood. Then it will step up to the 122mm diameter BEHIND the cutouts on the hood. The filter will mount on the front of it. I run a CNC lathe at work and could make the piece easily. I know it's difficult to visualize, so just think of this. Stand the lens facing up and lay the 122mm filter on the hood. That's where the filter will go. Do you think it will work? At 15mm, could a filter cause distortion or degrade image quality in the corners? Yes I know filters at that size cost a fortune, but there are 122mm cir pol's and ND's on Ebay for a low price to see how it works. Even if it vignettes a little at 15mm and I have to use it at 18 on 35mm/FX, I'd be happy with that.

Bill

D7100 D300, F4e, N90s, N6006, N2000, N6000, D40, N5005, black F2 eye level, chrome F2AS, black Nikomat FTN

Non Nikons: Pentax 645, Pentax ME Super, Pentax Spotmatic II, Minoltas SRT 102, SRT 202, Maxxums 7000 and 7000i, Praktica LB, Kiev 4 rangefinder, Canons TX, A1, FT QL, EF, EOS 630

So many cameras, so little time....

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