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01-04-2010, 09:30 PM   #1
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Lens 70-200mm 2.8?

I don't think Pentax makes a 70-200 f2.8?

Sigma and Tamron both make the lens for the pentax.
Anyone care to reccomend one of these lens? My first need is quick focus, low ight stuff. I currently have the k10 but will be upgrading to the k7 soon.

01-04-2010, 09:37 PM   #2
Ash
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Numerous threads about this type of lens are on the forum.

Firstly, Pentax has made an FA* 80-200 f/2.8, now discontinued, but still an excellent lens (expensive too).

More cost effective are both the Sigma 70-200 HSM II (PentaxForums.com Third-Party Pentax Lens Review Database - 70-200mm f/2.8 II EX DG APO Macro HSM AF) and Tamron 70-200 (PentaxForums.com Third-Party Pentax Lens Review Database - 70-200 f/2.8 Di LD Macro).

I discussed my impressions of these lenses here...
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/83402-tamron-7...-practice.html
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/69207-request-...0-f-2-8-a.html
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/72242-sigma-70...lity-test.html
01-04-2010, 09:39 PM   #3
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On the film cameras of the 90s, you would use

FA* 28-70/2.8 AL

and

FA* 80-200/2.8 ED [IF]

Pentax now offers DA* 16-50 f/2.8 and DA* 50-135 f/2.8 which give you the equivalent angles of view on a cropped sensor.
01-04-2010, 09:58 PM   #4
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Yes, although having the 50-135/2.8 is not quite the same as having a 70-200/2.8
There's compromise on 'reach' with the DA*

01-05-2010, 12:21 AM   #5
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I've played both (Sigma HSM and Tamron with screw-drive)... (but have not purchaised yet)

Tamron is my choice. It feels rock solid and sharper. It has more neutral color rendering.
While Sigma performs a little bit softer at 2.8, yellowish and is silent (but I like hearing when AF is working and how hard - I live in Siberia and like shooting at -30C)


PS: asdf . why you think, that Lance is searching for equivalent of film 70-200?
For example I like "cropped" focus lengths of 70-200 and don't understand 50-135. (While on FF I like 135/2.8 and dislike 85/2.0 on crop)
01-05-2010, 12:25 AM   #6
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QuoteOriginally posted by Ash Quote
There's compromise on 'reach' with the DA*
And the compromise of having SDM.
01-05-2010, 01:23 AM   #7
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QuoteOriginally posted by Damn Brit Quote
And the compromise of having SDM.
Some find it an advantage.
01-05-2010, 01:37 AM   #8
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QuoteOriginally posted by Ash Quote
Some find it an advantage.
Unfortunately, some SDM motors are made of acidic paper that corrodes over time, even when in storage.

01-05-2010, 01:54 AM   #9
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QuoteOriginally posted by Ash Quote
Some find it an advantage.
Until it breaks.

Let's face it, having a lens with SDM is a little like playing Russian Roulette.
At least with Russian Roulette, you're not going to care after you lose.
01-05-2010, 02:07 AM   #10
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QuoteOriginally posted by Damn Brit Quote
Until it breaks.

Let's face it, having a lens with SDM is a little like playing Russian Roulette.
At least with Russian Roulette, you're not going to care after you lose.
Never been much of a gambler, Gary.
So the SDM lenses are doing well with me.
01-05-2010, 09:07 PM   #11
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locks wide open Tamron

I have read where the aperture sticks when it is wide open. Is this a common malfuction with this lens or have they fixed the problem?
01-05-2010, 10:05 PM   #12
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QuoteOriginally posted by Lance C Quote
I have read where the aperture sticks when it is wide open. Is this a common malfuction with this lens or have they fixed the problem?
I just bought a copy of the lens new stock about a month ago, and it had this problem. However, in buying new, I got great warranty service. They repaired and returned it in about 5 days free of charge and there is no longer any kind of aperture sticking. Great quality warranty service. Buy new, and you will be extremely happy with it -- it's the best IQ I've ever seen in a lens this range.
01-05-2010, 11:12 PM   #13
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Lance, it's a common problem I'm afraid.
I bought one myself knowing it WOULD stick on me, and two out of two copies did from B&H (brand new). I asked B&H to repair it the second time and they'd done so for me as it occurred basically from Day 1 of receiving it. The repair took over 10 weeks.

Being in the US you'll have better chances of it not inconveniencing you so much.
01-06-2010, 12:15 AM   #14
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I bought mine used and it never had the sticky aperture problem. So I guess I got a bit lucky on that one.
01-06-2010, 02:55 AM   #15
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I have been looking for a 70-200/2,8 for a couple of months. Had already decided to go for the Tamron. To my great surprise I came across a Pentax FA*80-200/2,8 in good condition. Got it for the price of a new Tamron.
After testing it extensively over the holiday season at temperatures down to -25 C, I am more than pleased with the lens. My fingers may still be aching from frost-bites, but it sure is an excellent lens!
I priorize image quality, which is the reason I would have chosen Tamron over the Sigma in this category. My understanding is that Tamron has a slight advantage in this respect.
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