I grabbed an old f1.7 along with a 135mm macro the otehr day at Goodwill, and pretty much ignored the thing until now since it was redundant (I already own an Auto Sears f/1.7). The thing is, they're two different lenses, other than in name and the fact they're both K-mounts. I sat down today to take a look at the 'new' lens, and realized that it has a number of marked differences from my older one.
The 'old' Sears has the red 'MC' and has 52mm threads, the new is all-white with 49mm threads. The 'old' lens doesn't have half-aperture stops, and is f/1.7 to f/16, while the 'new' lens has the half-stops and goes up to f/22. The 'new' lens is also a touch longer, and has a shorter minimal focus distance which surprised me (in a good way).
The thing is, I've never seen a pictuire of this 'new' lens in my futzing about online looking for information on the lens I already had. How rare is this thing? Does anyone else have any experience using it? If so, what impressions does anyone have of it?
I'm thinking the lens I picked up may be an older version due to the build and the similarity to the old screw mount lenses I've seen.
Here are the two lenses side by side, the differences are more than obvious even at a casual glance.
Minimal focus distance, wide open, first the 'red' (my older) lens and then the 'white' one. The blurriness of the first shot was my fault, not the lens. I've taken razor sharp images with it wide open before.
Again, Red then White lens, minimal focal distance, wide open.
Last edited by Sagitta; 04-05-2012 at 05:17 PM.