Ari, I've got the SA 121mm f/8 lens too. On 4x5 it mirrors my 250 on 8x10. Feels like a 35mm lens on a 35mm camera. I haven't tried it straight on with 8x10. It''s pretty wide!
I bought the thing off Ebay for about $175 shipped. I checked the shutter with my shutter speed tester and to my surprise it was accurate. What a bargain!
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