here some pictures with the Vivitar 28mm / f2.5 MC Auto Wide Angle, this lens is similar to the other lens that gotta today, but with screw mount M42 , it's really good, I have almost two weeks and had not used, had much work last and this week so now with this new lenses to my collection, I decided to do some shots. Nex7 and Minolta Rokkor 50mm f1.4 <a href="http://www.flickr.com/photos/freddy_007/8207840368/" title="Manual Lenses. by Freddytto Robles, on Flickr"> {} "1024" height="684" alt="Manual Lenses."></a> <a href="http://www.flickr.com/photos/freddy_007/8206747533/" title="DSC08841cc by Freddytto Robles, on Flickr"> {} "1024" height="684" alt="DSC08841cc"></a> Nex7 and Vivitar 28mm f/2.5 Auto Wide-Angle MC 1/10s ISO200 f/2.5 <a href="http://www.flickr.com/photos/freddy_007/8206750377/" title="Yashica TL Electro X by Freddytto Robles, on Flickr"> {} "1024" height="664" alt="Yashica TL Electro X"></a> Nex7 and Vivitar 28mm f/2.5 Auto Wide-Angle MC 1/6s ISO200 f/2.5 <a href="http://www.flickr.com/photos/freddy_007/8207843026/" title="Yashica TL Electro X (1968-1974) by Freddytto Robles, on Flickr"> {} "1024" height="663" alt="Yashica TL Electro X (1968-1974)"></a> Nex7 and Vivitar 28mm f2.5 1/8s ISO200 f/2.5 <a href="http://www.flickr.com/photos/freddy_007/8207835508/" title="Self-portrait 2 by Freddytto Robles, on Flickr"> {} "1024" height="651" alt="Self-portrait 2"></a> All these shots were in jpg, without any PP, provides a good contrast, but I read that some copies have some problems to get focus, in my case I found regular in fact was a very quick review, the focus ring feels very smooth but the body very heavy, heavier than the camera itself. Nex7 and Vivitar 28mm f/2.5 Auto Wide-Angle MC 1/4s ISO400 f/2.5 <a href="http://www.flickr.com/photos/freddy_007/8206746289/" title="The Tv control by Freddytto Robles, on Flickr"> {} "1024" height="684" alt="The Tv control"></a>
The first thing I noticed is that the Vivitar 28mm/2.8 and the 2.5 have very LARGE front glass elements - compared to most 28mm primes I know of! The front glass element of those Vivitars are even bigger than the Yashinon 50mm/1.7 so I mistook them for 50mm/1.4 lenses...
yeah, you're right, although at first glance appears to be identical, some very small variations among them, besides being both too heavy, not bad.
