Originally posted by kiwi_jono Well my current favorite lenses are not necessarily the best as compact size is important to me. For FF:
The glaring hole (especially given I shoot mostly landscapes) is a favorite lens wider than 28mm. This is because I don't really have an ideal fit (compact, wide enough, good IQ and relatively affordable) for me but on often carrying one of:
* Pentax K 17mm f4 fisheye (carry it quite a bit as its so small - and sometimes use then defish)
* Sigma EX 20mm DG f1.8 (a bit on the bulky and heavy side for me but still carry it quite often - IQ can be good if focused correctly)
* Cosinon 24mm f2.8 (small and compact but only "Ok" all round performance)
This is interesting as my needs are similar (also for K-1). There is also some overlap to what I currently have:
* Sigma 28mm f/1.8 - not wide enough
* Sigma 20mm f/1.8 - new acquisition which I am still learning to know. So far it looks good IQ wise, but it is not WR. it always rains where I need to take pictures!
* Irix 11mm f/4 - excellent in many places (such as wide open hillsides) but it is too wide for even some landscapes and corners distortion limits usability in built environments. WR
* DFA 15-30 - my go-to choice if it is a phography trip. Too large and heavy to take for family outings or city trips..
So my long time wish toward Pentax has been an affordable weather resistant 15 or 20 maybe up to 35 mm prime, f/4 and small form factor. f/4 is perfectly good for landscape.
I will be looking into the Cosinon 24mm on your listing. In pictures it looks like the size is very pleasant.