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07-14-2009, 05:38 PM   #1
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21mm mini shootout

I've got a group photo to shoot, which in last year required a 21mm fov at f/4/ or f/5.6 on a Pentax digital. So, this year, I tried out four lenses in my bag that hit 21mm. They are:

Pentax 21mm DA 21ltd f/3.2
Pentax DA 18-55 f/3.5-5.6
Pentax DA 17-70 f/4
Sigma 17-35mm f/2.8

So, I shot a newspaper on the wall. Not perfect, because I'm sure it is never exactly perpendicular, but anyone care to guess the ranking in sharpness at F/4 and f/5.6?


Last edited by GeneV; 07-15-2009 at 10:12 AM. Reason: Correct typos in lens description.
07-14-2009, 08:21 PM   #2
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QuoteOriginally posted by GeneV Quote
anyone care to guess the ranking in sharpness at F/4 and f/5.6?
Nope. Why don't you tell us.

mike
07-14-2009, 08:42 PM   #3
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I can post the newsprint photos tomorrow, if anyone cares, but the winner at the larger apertures was IMO a tie between the DA21 and the DA 17-70. The surprise was that Sigma finished below the kit lens, especially at the corners. Actually, any of these lenses do very well in the middle.

I had expected the LTD prime to do much better than any of the zooms, but my copy of the DA 17-70 seems to really shine at this focal length, even wide open.
07-14-2009, 09:13 PM   #4
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Slight Corrections

QuoteOriginally posted by GeneV Quote
I've got a group photo to shoot, which in last year required a 21mm fov at f/4/ or f/5.6 on a Pentax digital. So, this year, I tried out four lenses in my bag that hit 21mm. They are:

Pentax 21mm DA 21ltd f/3.5
Pentax DA 18-55 f/2.5-5.6
Pentax DA 17-70 f/4
Sigma 17-35mm f/2.8

So, I shot a newspaper on the wall. Not perfect, because I'm sure it is never exactly perpendicular, but anyone care to guess the ranking in sharpness at F/4 and f/5.6?
Not a huge deal but the DA21 is f3.2, not f3.5 as listed. The kit lens is f3.5-5.6.

07-15-2009, 10:12 AM   #5
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QuoteOriginally posted by felix68 Quote
Not a huge deal but the DA21 is f3.2, not f3.5 as listed. The kit lens is f3.5-5.6.
Pardon my typos.
08-08-2009, 05:11 PM   #6
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GeneV,

It sounds like the 17-70 performs similarly to the DA 21 at 21mm. Could you provide any additional thoughts? Contrast, etc.? I would love to see the samples...

I have the Pentax 17-70 - but I much prefer my DA 40. I was thinking about getting a limited trio (15-40-70 or 21-40-70) - but only if they perform significantly better than the 17-70. Any insight would be greatly appreciated...

PS- I have read that the DA 70 is noticeably better than the 17-70 at 70mm
08-08-2009, 07:30 PM   #7
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I do care I'm in the market for either the Sigma 17-35mm, 15-30mm, 10-20mm, or the Pentax DA 12-24... if only you included the other three as well, but I think someone else testing the 17-35 should give me a ballpark on how good it is.

Let me guess the sharpness ranking:
f/4 > DA 17-70, Sigma 17-35, DA 21, DA 18-55
f/5.6> DA 21, DA 17-70, Sigma 17-35, DA 18-55
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