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As you may know, I recently bought into Pentax with the K5iis, 35/2.4, 50/1.7, and 17-70/4, and I'm looking for advice on how to fill the holes. I prefer shooting short zooms (2-4x) but I also like the prime way of life. I will need a macro (can be mf), portrait lens (stuck between the 77mm and 70-200 or 50-135). I have already decided on the 12-24 fow my uwa needs, but would you advise for a 77mm or the versatility of a zoom. Also, do you think the 31mm f1.8 should replace my 35/2.4? People are saying that it is superb and special but the f2.4 is really, really sharp already. For the macro, would a 50mm, 70mm, 100mm, or 150mm be more versatile, I do flower shots and the occasional bug shot. I was thinking either the 50 or 70, which would go well with the range of my 17-70 and bridge the 17-70 with the portrait zoom, or the 150mm which would fall at the end of the 50-135. Also, for a tele lens for airshows and occasional wildlife, can you recommend a mf lens with iq that is comparable to the Sigma 150-500? I usually use mf on my Sony and Tamron 200-500 anyway, so I might save with a mf lens, but I need the image quality to be there. Going by my current thinking here's a plausible lineup
12-24
17-70
31 limited or 35 f2 ( sounds very convincing)
70-200 or 50-135
150 macro
Sigma 150-500