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11-17-2010, 11:41 AM   #46
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QuoteOriginally posted by soppy Quote
Ideally a 17-70 would be perfect for what I want, but nobody makes that with constant 1:2.8 which is something I really need, especially considering how overcast London can be as well as the number of museums I am hoping to go to.
A constant-f/2.8 17-70mm lens, if it existed, would be so large & heavy you wouldn't want to carry it around anyway.

For outdoor shots, f/2.8 is generally not important. You will often want to stop down to at least f/5.6 anyway for depth of field considerations. If the sky is overcast, just increase ISO a bit.

And for indoor shots, with a K-5's high-ISO performance f/4 should not be a problem at all. And again, you'll probably want to stop down to f/4 or more for depth of field.

11-17-2010, 11:51 AM   #47
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Right ISO... I keep forgetting that I won't be shooting much with this on the K100D. With my current body, I am very hesitant to bump up ISO due to the increase in noise I see. With the K5's ISO performance though...

Now which 17-70 is the best? Sigma has about 5 of them and Pentax has their 1:4 version. I lean towards Pentax now because I have heard good things about their glass, but really have no experience with the higher end stuff (read: anything other than the kit lens).

Pros and Cons are appreciated. Suggestions anyone?
11-17-2010, 12:10 PM   #48
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The MTF's at photozone seem to favour the Pentax, but there is a very slight difference between the figures and the prices of each lens. My personal inclination would be to get the Pentax, but it would likely be best to actually try both of them.
11-17-2010, 12:21 PM   #49
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What would be the best way to try them if I'm located in Florida and Ritz, my only local camera shop, doesn't carry them? Rental maybe?

11-17-2010, 12:36 PM   #50
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I'm joining this string late, as usual. I'm one of those who would recommend checking out the 18-135 WR when it comes out. I suspect the optics will be well above the kit lens and it may likely turn into one of Pentax's most-useful lenses.

Now... having said that, I will add that in EVERY vacation I have taken in an urban environment, I have needed a wider rather than a longer focal length. With that in mind and the fact that the OP said he is on a budget... I recommend the following:

EITHER the Sigma 10-20mm (the f/4-5.6 version for under $500, NOT the f/3.5 version) OR the Tamron 10-24mm f/3.5-4.5 (about the same price as the slower Sigma but comes with a six-year warrantee and currently has a $100 rebate - meaning your total outlay will be under $400.

And ALSO the DA 35mm f/2.4. This is brand new, lists at $219 (but you might be able to find it for a bit less already) and is a half stop faster than the DA 40mm f/2.8 Limited. The 40 Limited is smaller but the 35 is probably a bit lighter. You'll use this lens inside museums.

Your total lens outlay would be about $600 for two lenses if you go for the Tamron UWA and about $100 more if you go with the Sigma.

Of course, if you're REALLY worried about size and weight, you could opt for all primes: the DA 15mm f/4 Limited at about $500 and EITHER the DA 35mm f/2.4 ($219) or the DA 40mm f/2.8 Limited ($339).

Last edited by Biro; 11-17-2010 at 12:42 PM.
11-17-2010, 01:18 PM   #51
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QuoteOriginally posted by soppy Quote
Rental maybe?
Maybe, I doubt you could really make a bad decision. My personal thought is that if they are the same price, stick with the constant aperture zoom. But also have a look at photozone.de and see for yourself.
11-17-2010, 01:28 PM   #52
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Yeah not 3rd party plus constant aperture makes me lean towards the Pentax...
11-17-2010, 01:30 PM   #53
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QuoteOriginally posted by soppy Quote
not 3rd party
I wouldn't worry about the brand. Sigma, Tamron, Pentax etc. all make great, and lousy, lenses.

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