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12-18-2010, 11:40 PM   #1
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Tamron 17-50mm f/2.8 and/or SMC Pentax-FA 50mm F1.4

Curious, any experience with the Tammy at the 50mm FL in contrast to the IQ from the FA 50mm F1.4?. Point being, if one had this 17-50 lens, is the IQ/contrast/bokeh, etc similar to the output fom the prime? Is the Tammy good enough at this length that the 50 1.4 is redundant? Would love to have a walkaround lens that comes close to the FA 50mm F1.4 output. Perhaps I'm being too simplistic, but if not apples to apples, is it at least Romes to Macintosh's?

Input appreciated

12-19-2010, 12:57 AM   #2
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bokeh on fix is more beatify.
12-19-2010, 01:32 AM   #3
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I have not shot with that Pentax 50mm, though I have taken over 15,000 shots with the Tamron. The most obvious difference between the 2 lenses is the 2 extra stops of speed the Fa provides on the one hand, vs the broad focal range the Tamron supplies on the other. Here is a shot Wide Open (cropped some) @ 50mm.



The bokeh is tested here, seriously, with tree branches & bright light immediately behind the subject. This next shot is 50mm, but @ f8:


Last edited by Jewelltrail; 12-19-2010 at 02:11 AM.
12-19-2010, 04:26 AM   #4
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As obvious as it is, it's really the only point to make: the Tamron 28-75 cannot do f/1.4-2.8 like the FA 50 can, which can be a big deal to some. If it doesn't to you, then it won't matter which one you go for unless you definitely want zoom capabilities.

12-19-2010, 09:23 AM   #5
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I owned an FA 50 1.4 for a week just recently. It's a very, very good lens. But it's not great. It has a bit of trouble locking focus, and the 2 stop advantage over a 2.8 lens, if more of a 1 stop advantage, because the lens is pretty soft under f2.

Now it's really a killer lens overall and I reviewed it as such, but I decided to sell it along. I figured I could use my DA 40, and A 50 1.7, to do most of the things that the FA can do. In other words, if you need some low light help (where autofocus is at it's worst), give a manual 50mm 1.7 a try. They are really good as well.
12-19-2010, 01:43 PM   #6
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QuoteQuote:
paperbag: ......and the 2 stop advantage over a 2.8 lens, if more of a 1 stop advantage, because the lens is pretty soft under f2.
Good point
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50mm, f1.4, fa, k-mount, output, pentax lens, slr lens, smc pentax-fa 50mm, tammy, tamron 17-50mm f/2.8
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