Center Filter for Nikon 150-SW

[Cindy_4701]

After owning this lens for a year, I've finally decided that I need to get a center filter for it. Since Nikon doesn't make filters, I wanted to double-check with someone here as to which one I should get. It takes a 95mm filter and it looks like it should be Schneider IV but there seems to be an IVa and IVb. I'm not sure of the difference.

Thanks!

[Eric Leppanen]

http://www.schneideroptics.com/ecommerce/CatalogItemDetail.aspx?CID=182&IID=1856

http://www.schneideroptics.com/ecommerce/CatalogItemDetail.aspx?CID=182&IID=1863

The 4A and 4B have correction factors of 1.5 and 2.0 stops, respectively. I would definitely go with the 4A since the Nikon has relatively good fall-off characteristics to begin with (better than the SS150XL for which the 4A is intended), and the denser 4B would further slow your shutter speeds without any meaningful benefit.

[frank pinchak]

Back off with your tripod; mark your groundglass to 3 x 4. Compose for this size.

I had trouble making 8 x 10 contact prints. Now I back off and compose at 7 x 9 and eliminate (by trimming) the underexposure on the edges.

See the sizes on prints by Weston, Stieglitz, Kasabier et al.