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Old Nov 30, 2007, 4:35 AM   #1
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do you think the pentax 18-250 ( or the tamron version ) on a k10d is equivalent in quality to the nikkor 18-200 vr on a d80?

I'm really attracted to the super zoom, and I've seen great pictures from the nikon one, but If I could get same results on pentax I would be much happier.
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Old Nov 30, 2007, 7:27 AM   #2
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I haven't seen any MTF reviews, yet, but here's some sample shots:

http://forums.steves-digicams.com/fo...jump_to=826717


Hmmmm...looks like you can buy three of the Pentax for the price of two of the Nikons.
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Old Nov 30, 2007, 10:46 AM   #3
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if quality is comparable yes
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Old Nov 30, 2007, 11:13 AM   #4
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Hi Lando,

Check the reviews here (in the N*kon section) for both lenses.

http://www.photozone.de/8Reviews/index.html

A quick glance says to me that they are pretty comparable in optical quality, with the Tamron a bit softer at the long end, but with better performance at the shorter FLs.

I would make speed at the long end a potential issue (for my use -- I like teles). At f6.3 @ 250mm, I wouldn't expect that you could retain AF with any TCs (that fit between the body and lens), but you might be able to extend the reach acceptably with a screw-on TC like the Olympus TCon 17 without losing effective aperture since the lens has IF, and the focusing motor wouldn't get stressed by having to turn the extra mass. You'd get significant vignetting at the short end, but you don't usually add a TC to use it at the short end of the zoom range. . .

Scott
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Old Nov 30, 2007, 5:30 PM   #5
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I'm not really considering converters, I just want to have the 18-200 range covered by one lens, and it has to be stabilized.

If the pentax 18-250 is at least on same quality as 18-55 + 50-200, than it's more than enough for me.
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Old Dec 2, 2007, 8:32 PM   #6
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I have the Tamron 18-250 on a K100D and it's quite nice. For me the quality of the pictures is more than acceptable,particularly theshots that I would have missedif I had a narrower zoom range. I have about a dozen lenses but seldom use anything other than the 18-250.
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Old Dec 3, 2007, 4:38 AM   #7
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Bill can u tell me at which focal length it becomes 6.3 aperture?
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Old Dec 3, 2007, 9:14 AM   #8
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Just beginning to appear in the UK ay GB£400 which is over GB£100 more than the Tamron.

Given that it's just a re-branded Tamron, I don't know how Pentax can justify the high price.

Still related, I believe that Tamron lens come with a 6 year warranty whereas Pentax lens is a mere 1 year.

Guess which version I'll probably end up with.
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Old Dec 3, 2007, 2:51 PM   #9
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Lando,
It's 5.6 at 150 then jumps to 6.2, then 6.3 at 250.
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Old Dec 4, 2007, 7:27 AM   #10
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is the pentax identical to the tamron or does it have the smc coatings as speculated?
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