|Posted: Thu Mar 26, 2020 6:42 am Post subject: Re: Tamron Adaptall-2 135mm 2.5 and 200mm 3.5 (03B and 04B)
|Thanks for sharing the diagrams, D1N0.
Tamron labelled both the 03B and 04B lenses as "Close Focus". I'd agree that the 135mm 03B with a minimum focus distance of 1.2m is a close focuser. But the 200mm 04B with a MFD of 1.7m strikes me as being okay, but not really "close". I guess I've been spoiled by the excellent 1.2m MFD of the Vivitar Series 1 200mm.
Anyway, I was interested when I found an item in an old issue of Popular Photography magazine (U.S.) about the announcement of an "SP" 200 f/3.5.
From the June, 1978 Pop Photo, here are some excerpts from a report on the April, 1978 Photo Marketing Association show in Chicago:
A 94cm MFD? Now that's what I'd call Close Focus! That SP 200 sounds entirely different from the 04B http://www.adaptall-2.com/lenses/04B.html
I wonder if the SP 200 was ever produced..?
|. . .
The rear element of the 135m doesn't look to do much. Almost flat.
Since I have too much spare time, I took the rear element out of my 03B 135mm to see what difference it would make.
The answer is: That little piece of glass makes a big difference!
With the rear element out, focus went far beyond infinity and magnification increased significantly. I had to add several extension tubes to get near the original MFD of 1.2m. And with the added extension, maximum focus distance was about 1.6m.