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12-18-2010, 10:14 PM   #1
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lens selection k20d

if anyone can suggest a high quality lens that i can use on a k20d without breaking the budget,as i have worked out that the 2 current lenses( f-smc 35-70 and f-smc 70-210 on the dslr are actually 55-105 and 105-310 ) and probably looking for something below 55.

12-18-2010, 10:34 PM   #2
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how bout Pentax 17-70mm or Sigma 17-70mm.

I used to have Sigma 17-70mm (non OS version). It is a good walkaround lens. love it a lot, but have to sell it. Market price around $200-$250 second hand, new one around $400 (I think ).

Or probably FA 28-70AL f/4, it's also good. I use it on my Z1 :-)
12-18-2010, 10:36 PM   #3
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Based upon your existing lens setup, I feel that you might consider:
- a wide angle lens, and/or
- a fast prime lens (large aperture, low f)

For the second suggestion, I can recommend very strongly the Voigtlander Nokton 58mm f1.4. Excellent IQ. Excellent low light capabilities. Very sturdy.

Food for thoughts....
12-18-2010, 11:00 PM   #4
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I second the 17-70. It's a great lens, sharp and has good color rendition. Another good choice is the Tamron 17-50 2.8. It's about the same price and a stop faster.

12-19-2010, 12:36 PM   #5
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Well, obviously there is the kit lens, which is pretty good (18-55) and comes in a variety of flavors (original, II, and WR).

Then there is the 16-45 which is very good quality and has come down in price, but still has a wide range ~ 150 to 500. The 17-70 is a bit more 400 to 500.

21507 Pentax SMCP-DA 16mm - 45mm f/4.0 ED-AL Autofocus Zoom Lens for Digital SLRs - USA

Pentax SMC DA Zoom lens - 17 mm - 70 mm - F/4.0 - Pentax KAF

The 16-45 at $150, even considering international ordering, shipping and customs might well be worthwhile.

There is also Sigma and Tamron.

You can also go for older primes K, M, A, and FA also at 20mm and 28mm

Personally, I like AF lenses without the motor, some what less to go wrong.

12-19-2010, 02:19 PM   #6
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radeb: if anyone can suggest a high quality lens that i can use on a k20d without breaking the budget,as i have worked out that the 2 current lenses( f-smc 35-70 and f-smc 70-210 on the dslr are actually 55-105 and 105-310 ) and probably looking for something below 55.
I was in this situation and chose the Tamron 17-50 2.8. Great lens and great value. I have not looked back. There are some great values in this range made by Sigma and the Pentax 16-45 f4 is a nice lens. Here is a shot with the Tamron.

12-19-2010, 04:30 PM   #7
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QuoteOriginally posted by radeb Quote
i have worked out that the 2 current lenses( f-smc 35-70 and f-smc 70-210 on the dslr are actually 55-105 and 105-310 )
The 35-70 is not actually 55-105, it is actually 35-70, no more, no less.
The 70-210 remains a 70-210 no matter what camera it's mounted on.

Putting a lens on another camera with another frame (film or sensor) size does not change the lens. A smaller frame sees less of what the lens projects, that's all. Unless you are an experienced 135/FF (35mm) photographer transitioning to an APS-C or 135/HF camera, FORGET YOU EVER HEARD OF CRAP FACTOR. (I learned that the hard way when I got a 400mm tele for my half-frame Olympus Pen-FT. OH BOY, IT"S A 600MM LENS! No it isn't. It's a 400mm lens, but the sides of the picture are sliced off by the smaller frame. Ratz.)

That said: On an APS-C camera like our dSLRs, 35-70 is long-normal to short-tele, and 70-200 is mid-long-tele. (And those F's are both good glass!) As suggested above, what you are missing is wide-to-normal, a hole which an 18-55 or 17-50 or 16-45 fills well. If you aren't concerned with speed, any such zoom will be fine. If you ARE concerned with speed, and budget, and don't require AF, many many fine fast manual primes are available at 24-28-35-50-55mm. Some of my best at each of those focal lengths cost less than US$10 each. But I'm a cheap bastard.

And after you acquire a wide-to-normal, think about an ultrawide, a 10-20 or 8-16. Oops, that last will break your budget. Bother...
12-25-2010, 11:28 PM   #8
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I'm on the 17-70 bandwagon too. I opted to go for the Sigma rather than the Pentax (can I admit that in here, without being stoned by an angry mob?) as it's an F2.8-4, whereas the Pentax is just F4. Also the Sigma offers OS, which I actually find is a little more effective than my K20D's in-body stabilization. I'm very impressed with the IQ.

12-26-2010, 08:45 AM   #9
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As you don't give a budget, DA12-24 or similar if you need really wide.

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