Originally posted by Pepe Guitarra How does it compare to the K135mm f2.5? Also, can you use it in MANUAL, or does it have to be used in Av?
It's pretty much the same. Somehow the Tak is just a bit lighter, something like 15 grams. The hood reverses better for storage on the Tak but threads on. I had them both and chose to sell based on how much I paid.
The dust in this lens might be accessible by unscrewing the barrel, in front of the focus ring. You can clean the element in front of the aperture, and blow out the one behind it.