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Post by paulhofseth on Jun 19, 2014 14:27:13 GMT -5
I could not resist aquiring one of the most compact 135s I have ever seen. Sigma (greek letter before the serial no 7103). Completely strange basic thread mount, but an original adapter for M42 was fastened on it. T1 adapter? OK pictures.
Sigmas netsite is useless, as is google search which just wish to flog more recent stuff.
Anyone here with info on this?
p.
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Stephen
Lifetime Member
Still collecting.......
Posts: 2,718
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Post by Stephen on Jun 19, 2014 15:47:56 GMT -5
There were early 135mm Lenses from Tamron, and Sigma in pre-set aperture, the Tamron had the "T" mount as it was their design, but went through two forms, the later surviving to this day. Sigma were a little later than the Tamron, and by that time T mounts had spread to most other Japanese makes. ..any pictures?
Stephen
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Post by paulhofseth on Jun 20, 2014 7:25:09 GMT -5
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Stephen
Lifetime Member
Still collecting.......
Posts: 2,718
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Post by Stephen on Jun 20, 2014 16:35:48 GMT -5
That appears to be a lens from the mid 1960's onwards, the earlier ones had a flat front name ring, this version is the more modern international style the Japanese were adopting at the time. It should be a standard T mount. The optics are best described as modest, only a test will show the quality. They were made to sell at a competitive price, not to a performance level. But Sigma were an independent maker and had to show advantages over rivals, and quickly gained a reputation as better class glass, at the price level.
Stephen.
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Post by philbirch on Jun 21, 2014 3:10:52 GMT -5
What Stephen says in true and many 'own brand' lenses were made by Sigma and others down to a price. There is always a quality trade off. In the old days you probably had your prints at 3½ X 5½ inches and that was good enough. Slides would have been projected through an equally cheap projector lens.
However the 135 f3.5 is the simplest lens for manufacturers to make so most lenses will be reasonable.
Good news. Because of the (usually) large image circle associated with 135's, if you use it on a crop sensor digital camera you will only use the 'sweet spot' in the middle. That combined with an aperture of f8 you should get images that will be almost as good as its more expensive counterparts.
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