Originally posted by kcobain1992 Took a look at your pictures, absolutely nothing wrong with the lens in my opinion. The one marked "self evident" is the least evident one. I think you are just being picky about the "grain". I don't know your background with your K-5 or digital/film photos in general, but those are high contrast scenes and the shadows are likely to be a little noisy and appear slightly grainy. Again, if this kind of grain bothers you, you might be allergic to film.
I mentioned about your background with the K-5, because I don't know whether this is your only manual lens. Apparently you aren't using it right. There's a post somewhere around here which will help you improve some aspects of your shooting style with your lens. I will try to sum it up so you don't have to look for it.
Basically, you were using it in Av. That makes the aperture ring unusable, because it will only meter wide open and shoot wide open, regardless of the aperture selected [I'm not going to explain here why]. Looking at your EXIF info, it seems that all of your shots were taken wide open. NO WONDER the image quality suffers. Things like chromatic abberation, softness and maybe that graininess that you are talking about, all of them disappear if you shoot at about f/8 - f/11 in those conditions.
My second point: why use auto ISO? I always like to control my exposure manually, by selecting the lowest ISO that can get me a shot without shake blur, and an aperture closed enough so it will be as sharp as I wish. I only step up from 100 ISO if absolutely necessary.
My third point: I have found out that auto white balance produces weird effects with some lenses, and it's best to either set the white balance manually (in either "daylight" or what balance you prefer), or shoot RAW and correct the cast at home. In some of your shots, the magenta cast is obvious.
Keep taking pictures with that Zenitar, you'll get used to it quickly and it'll produce some amazing pictures for you!
This is not my only manual lens, I actually have quite a few... I do realize why shooting in Av is an error, you should know that those pictures, the exif data might say they were all shot 2.4, (which they were when in Av mode), but I did know not to use 2.4, I just didn't realize that it was going to shoot that way regardless, thats why after finding that out, i went outside and tried some more pics in M mode stopping down the aperture more. The results were the same however. As far as auto ISO, I only did it to try to troubleshoot possible user error, normally I always force ISO between 80-200. As far as the WB, that I did not try, left it in auto, I am going to go try manual WB in a moment. As far as RAW, I always shoot in RAW, the pics in Flickr were JPG because I converted them for the purpose of uploading. I really do like the framing that this lens allows! Just gotta figure out what these other issues are about. Also another response in this thread stated that the rear filters are in fact needed and that if I didn't get them, I should return the lens. I did not get them, as I stated in the OP. I tried going to Zenit's website and sending them an email on their provided link to see if I can purchase the filters directly from them, however the email was returned as "un-deliverable". Any idea where else I could obtain those filters? I tried ebay and nothing.....