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08-18-2012, 11:08 PM   #16
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Tamron 17-50 wins in this battle EASILY with constant f2.8 as well as sharp all round lens over the Sigma 17-70, Pentax 18-135, and Sigma 18-250. If you are getting the DA* 50-135, the Tamron 17-50 will pair it up easily.

08-19-2012, 05:07 AM   #17
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QuoteOriginally posted by dr_romix Quote
Hello all,

Please help me out decide which lens to buy.

I initially had Sigma 17-70 for almost 2 years with my K7. You can find sample photos I took with this lens and my K7:

Flickr: dr_romix's Photostream

Since I wasn't happy with f4 at its 70mm for indoor pics while using high ISO on K7, I decided to sell it and get Tamron 28-75 f2.8 which has excellent sharpness and is great for taking indoor pics. I also paired that up with Pentax external flash which was a great addition for low lighting.

Then, I decided to sell my K7 and get K5 as I needed better ISO and image quality sensor. Now, when I look back, I kindda regret why I sold my Sigma17-70.. I would have had no problem with its 70mm f4 in low lighting with K5 and extra wide angle would make it a great walk around lens over Tamron 28-75. Sometime I feel Tamron is too long for some places. In terms of IQ, I have to say my Tamron is way sharper than siggi 17-70.

so here what I wanna do: Keep Tamron 28-75 for portrait. I'm going to also purchase Petax 50-135 to add to my portrait lenses.


Quality is still important factor. Macro would be a Plus... I noticed, extra 20mm becomes handy sometime..

so based on your experience especially on K-5, for general walk around, which one do you recommend? ( IQ is important too )

Sigma 17-70 vs 17-50 vs Pentax 18-135 vs Sigma 18-250 vs Tammy 18-200 ?


Thanks,
Since you have the 50-135 and the 28-75, just get a wide lens and you are set.

Or sell the 28-75 and rebuy the Sigma 17-70 F2.8-4.5 (old version) or the 17-70 F2.8-4. Both are wonderful portrait lenses too . . .

I have both the DA*16-50 and the DA18-135 and both are wonderful lenses.
08-19-2012, 07:05 AM   #18
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Thanks. I got Pentax 17-70 as bday gift. now it's even more confusing. It;s a great lens ( f/4) but not nearly close to 50-135 in sharpness.
08-25-2012, 06:57 AM   #19
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QuoteOriginally posted by dr_romix Quote
Thanks. I got Pentax 17-70 as bday gift. now it's even more confusing. It;s a great lens ( f/4) but not nearly close to 50-135 in sharpness.
The Pentax 17-70 is not sharp wide open IIRC, but its a good all purpose lens. If you do not really like the sharpness, exchange it for a Tamron 17-50 or the Sigma 17-70 or the Pentax DA18-135, all of which are great lenses, or even the 50-135.

08-25-2012, 06:59 AM   #20
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QuoteOriginally posted by felixkh Quote
The Pentax 17-70 is not sharp wide open IIRC, but its a good all purpose lens. If you do not really like the sharpness, exchange it for a Tamron 17-50 or the Sigma 17-70 or the Pentax DA18-135, all of which are great lenses, or even the 50-135.
*cough*

If he doesn't like the sharpness, he shouldn't get the 17-70 or the 18-135. They aren't any sharper.
08-25-2012, 07:19 AM   #21
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QuoteOriginally posted by JinDesu Quote
*cough*

If he doesn't like the sharpness, he shouldn't get the 17-70 or the 18-135. They aren't any sharper.
Oh, well, the it's the 50-135 for him then . . .
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