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I have the Sigma 17-50/2.8 OS since about 8 months now. Some days ago I directly compared it to the FA 43 and found out that I have to reduce the light by 0.7 to get the (nearly) same results. The...

In meantime I found an answer to my question.

Which macro lens do I need for a FA 43 to shoot at 1:1 or only at 1:2?

Which one is better Cosina 100/3.5 or Pentax M 100/4 or Pentax DFA 100/2.8 for macro and portraits according to bokeh and so called 3D?

Thanks for your comments.

I know both lenses have a very different focal length but nevertheless I would be interested in a comparison for sharpness, bokeh and the so called "3D" effect.

I love my FA 43, but it's not my only one. Sometimes it has this special 3D effect, more than other lenses I used. It has a very good foreground bokeh. The background bokeh can in some situations...

Still undecided between DA 55/1.4 and FA 43/1.8.

I would use Sigma 17-50/2.8 instead.

Thanks for all comments. Most of the time f/2.0 is enough for me but not 2.8. 85mm is too long. What's about the 43? Some seem to hate it, some love it.

I wonder what would be the best to use for portraits, the DA 70/2.4, the DA 55/1.4 or the FA 50/1.4. I like narrow DOF.

Totally agree on a swivel screen as well as better video.

but not on the K01 as I understood - right?!

In the normal mode on the K-5 the focusing works perfectly, but when I use liveview with the Sigma lens the focus is incorrect.

The Sigma 17-50/2.8 has some problems with Liveview on K-5, so the K-01 is working well with the Sigma lens?!

How about Sigma 17-50/2.8

http://www.dslr-forum.de/attachment.php?attachmentid=1797895&d=1305308273 http://www.dslr-forum.de/attachment.php?attachmentid=1797896&d=1305308273

The Sigma 17-50 is much better than the Sigma 18-50!

http://www. pentaxforums.com/reviews/pentax-16-50-vs-sigma-tamron-17-50mm/introduction.html

I tried three Tamron 17-50, all had different problems. All were not focusing properly at 17mm on my K5. Focusing was noisy. So I decided to buy Sigma 17-50. It's heavier but it is silent and never...