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06-26-2007, 10:44 AM   #1
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Sigma 28-70 2.8-4.0 EX for Pentax

Does anyone have experience or knowledge of this Sigma EX lens. It only costs $129. Advise, please. Freddy

06-26-2007, 11:13 AM   #2
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are you sure thats not 28-70 f2.8 EX ?

I didnt know they had a 2.8 - 4 zoom in that range?
06-26-2007, 11:38 AM   #3
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I'm pretty sure they did have a f/2.8-4. If it was constant f/2.8, it would cost alot more than $129! (closer to $300 or more depending on condition).
06-26-2007, 11:47 AM   #4
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Then maybe its not an eX but there difinitely is a 28-70 2.8-4.0 Sigma lens. Freddy

06-26-2007, 11:50 AM   #5
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ah yes, I just googled it, indeed there is, or was, such a lens. Then I cant help since I have the 28-70 f2.8.

I did get an impression of the lens from looking at the user review comments of it on the site that google coughed up though:
Weaknesses:
Soft throughout all apertures, in fact it is softer than the lens of my P/S digital camera!
Weaknesses:
Body has a plasticy feel, almost like it was a toy
Weaknesses:
All of the glass in it. There are many acceptable inexpensive lenses out there that produce very good results... this isn't one of them.
Weaknesses:
Could be sharper at the 28mm end.
Weaknesses:
sharpness could be better at both ends of the focal range

From that and since I assume my constant f2.8 version is supposed to be a higher end model than that one, I will conclude: stay away.

Even if its cheap, if its no good then you are just wasting the money. Save your money and get a good lens when you have eanough. If you are interested in that range then the tamron seems to be the way to go. Me personally I would get something wider, I never use my 28-70 because thats not a very usable zoom range for me (and of course because the lens is sh*t also)
06-26-2007, 11:52 AM   #6
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WOW, that lens sure sounds like a winner! Take that $129, add a few bucks and buy a FA 50mm f/1.4
06-26-2007, 12:15 PM   #7
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Yeah, thanks, guys. I guess I can forget about that baby. Any thoughts on the
Phoenix AF 100mm 3.5 macro lens. Seems to get good IQ reviews except it is cheaply
made but that wouldn't bother me because I'm very careful with my equipment and for around $100. it wouldn't be a tragedy if it broke. I'm also wondering if the AF version can still be used manual focus. Freddy
06-26-2007, 12:16 PM   #8
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Yeah, thanks, guys. I guess I can forget about that baby. Any thoughts on the
Phoenix AF 100mm 3.5 macro lens. Seems to get good IQ reviews except it is cheaply
made but that wouldn't bother me because I'm very careful with my equipment and for around $100. it wouldn't be a tragedy if it broke. I'm also wondering if the AF version can still be used manual focus. Freddy

06-26-2007, 12:26 PM   #9
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google is your friend:

Phoenix AF 100mm f/3.4 Macro Lens - A Nikonians Product Review
Phoenix AF 100mm f/3.5 Macro Telephoto Reviews at PhotographyReview.com

and klaus at photozone has tested it for pentax mount, so you can compare it with the pentax macros as well:
Cosina AF 100mm f/3.5 macro (Pentax K) - Photozone Review / Lab Test Report

Note that this lens has been branded and sold under the names of different brands, you will find a lot of info about this lens if you search more as well.
06-26-2007, 02:34 PM   #10
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Pretty much any auto-focus lens can be manually focused. Wouldn't make much sense otherwise.
06-26-2007, 04:21 PM   #11
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QuoteOriginally posted by fevbusch Quote
Any thoughts on the
Phoenix AF 100mm 3.5 macro lens. Seems to get good IQ reviews except it is cheaply
made but that wouldn't bother me because I'm very careful with my equipment and for around $100. it wouldn't be a tragedy if it broke. I'm also wondering if the AF version can still be used manual focus. Freddy
Hello Freddy

The Phoenix lens is one that was sold under a lot of different names, including Pentax. Mine is a Cosina and I bought it brand new with the matched multiplier to make it focus to 1:1. You are right about the build quality but optically it is a match for much more expensive lenses. Have a look here for some photos taken with it. Flickr: The Cosina 100mm f/3.5 Macro Pool
If it's going for $100 get one it's a steal at that price. The manual focus is fine. I use it all the time as I find AF not very effective for macro.

Carl
06-26-2007, 08:18 PM   #12
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Carl, I'm dying to see some pictures of something that was shot 25 feet, 50 feet, 100 feet or infinity. Will this Phoenix lens take really good pics at those ranges and for landscapes. Can you send me a picture. Would really appreciate.
I've also been seriously considering the DA 50-200 lens but somehow I like the Phoenix colors better. Thanks, Freddy
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