I'm looking for a cheap but decent wide lens for FF, preferably a small prime. 17mm is perfect and anything between 16mm and 20mm is ok depending on what I find. Budget is very small because I will only rarely use this lens.
Options I found are 17mm from Vivitar, Tokina and Tamron. Some things I don't really understand. The Tamron is Adaptall and I'm not sure how the mount works there. I need it for a Nikon mount actually but if I can fit it to both Nikon and Canon that's an advantage (I use both).
I'm also a bit confused about the different models from those companies. Some Vivtars seem to be Tokinas, some are not(?), the Tamron has several options (and the mount thing confuses me...) and the Tokina is available in more than a few options too (some seem to be AF too, which are too expensive I think).
I'd prefer to keep it around $200 but would stretch it a bit if necessary. Though I'm having a hard time finding any of these.