Andre Langevin <[EMAIL PROTECTED]> wrote: >> >Minolta and Sigma are quite common also. >> >>The Sigma is now discontinued. I have one and I'm quite pleased with it. >>It's a 58mm thread and works nicely on my 200mm f/4.0 for the 645. >>They're probably still to be found on eBay. >>Mark Roberts > >The Sigma (1,5 or 1,6 diopter) can also be found in 52mm and 62mm >(and "replace" Nikon 3T and 4T). The 58mm was offered as a specific >CU for their 70-300mm lens.
Fascinating. The famous "Achromatic Close-Up Lens Page" (http://www.angelfire.com/ca/erker/closeups.html) mentions only the 58mm version. And that was the only one I ever found on the B&H web page (when it was available). >Is there a mention of this lens on your close-up lens? I don't remember. And I don't have any of the packaging that came with the lens now. >> > Indeed, and easily obtained, even on eBay. But made for 52mm filter >> > size, so a step-up is necessary. No big deal. >> Andre > >>My Nikons were 62mm thread. >>christian > >The Nikon 3T is a 52mm and the 5T is a 62mm, both are 1,5 diopter. >Same pattern for 4T and 6T (2,9 diopter). I was thinking about >somebody using it on a typical Pentax normal lens with 49mm filter >size, but 62mm might in fact be more versatile as it would fit >"bigger" lenses like the 135/2.5 for example. Both the 3T and 5T are supposedly for longer lenses (80mm-200mm) >The 3T is a perfect fit for the F and FA 135/2.8 as this lens foc. >dist. stops where the CU begins, at about 0.7m and, as a 52mm one, >screws without any step-up ring. -- Mark Roberts Photography and writing www.robertstech.com
