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09-14-2010, 05:34 PM   #16
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QuoteOriginally posted by simico Quote
If you want to replace your 50-135 then in my opinion the obvious choice is Sigma 50-150 HSM.
The sigma 50-150mm indeed looks like a good alternative. You should look into it If you like the focal length.

09-14-2010, 07:48 PM   #17
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Weird...my 50-135 is no slower (no faster either) than any of my other AF lenses. I just shot at a wedding shower with poor ambient lighting, and it snapped right to focus within half a second each time.
09-14-2010, 08:05 PM   #18
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QuoteOriginally posted by ShiftR Quote
Weird...my 50-135 is no slower (no faster either) than any of my other AF lenses. I just shot at a wedding shower with poor ambient lighting, and it snapped right to focus within half a second each time.
I had mine out today and did some comparing due to this thread. Can't say I noticed any real difference. I wonder, how many people saying it's a dog, have ever actually used one. Not saying that about everyone but I do have my suspicions. Speaking of 50-135 dogs,

Pentax DA*50-135 SDM - a set on Flickr

On 4 different cameras.

09-14-2010, 09:52 PM   #19
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DA*50-135/2.8 has optimal AF speed. Any lenses faster are too fast. Anything moving faster than it can track should adjust their speed to match. Anyone who cannot see the advantage of its AF speed should be re-educated.

09-15-2010, 03:07 AM   #20
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PentaxPoke, that demonstration surely is demotivational. I've known before Canon was better in lower light focusing - but damn that is total domination.

And unfortunately not only is it slower but especially with my 16-50 focus often locks but totally in the wrong place (this is around what I guess would be EV6-7). I'm aware that focus points aren't really at the red squares' positions but I'm talking about massive misses.

From the lenses I have the 16-50 annoyingly is the worst one in terms of focusing speed and accuracy. My Pentax F 1.7/50 and Sigma 70-200 are much better - both of them are very fast. So I don't understand how you, stacylynn85 say focusing would be too slow on the (FA?) 1.4/50.

So while I can absolutely recommend the Sigma I may not fit your needs since it's only 70mm at the short end. Also not wider but probably as fast as the 70-200 I second or third the Sigma 50-150 HSM.
09-15-2010, 04:30 AM   #21
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QuoteOriginally posted by stacylynn85 Quote
I wanted to add another lens to my collection for wedding and portrait photography.
Many use the Tamron 28-75/2.8 for that. Highly regarded lens.
09-21-2010, 12:54 AM   #22
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How much of AF speed (in low light) is determined by lens vs camera?
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