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11-01-2007, 01:02 PM   #1
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Sigma 70-200mm for pentax ISSUE

I wanted to get the sigma 70-200mm lens for pentax, but sigma says there's no support for the HSM on the k100d. My guess is that it used the same slow ass noisy motor on the sigma 70-300mm.

So in short, I would be sacrificing AF speed if i bought this lens. Does anyone know if the Pentax 60-250mm has a HIGH SPEED quiet motor?

11-01-2007, 01:05 PM   #2
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I have the 70-200 f2.8 with the mechanical drive from the camera body.

I find it fast enough for all my needs and also quiet.

good luck finding one though, it is out of production for something like 2 years
11-01-2007, 02:22 PM   #3
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Got one too. An older non-DG version. Use it for sports. Plenty fast enough. Noise isn't an issue when on the pitch.
11-01-2007, 04:47 PM   #4
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I have the non-Dg version as well. I use it to photogragh rugby, amongst others. I find the auto-focus marginal. Obviously alright during the slower parts of the game, but as soon as someone starts running with the ball - forget it. Also once the light starts fading toward the end of the day in winter it starts to have problems.

I am really hoping the new cameras yet to be announced and the new 60-250, can solve those issues. But I ain't holding my breath.

11-01-2007, 04:58 PM   #5
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QuoteOriginally posted by dmadden Quote
Does anyone know if the Pentax 60-250mm has a HIGH SPEED quiet motor?
Wouldnt make a difference, your k100d would still be driving it with the screwdriver AF as it doesnt support SDM. Unless its a k100d super that you have
11-01-2007, 05:20 PM   #6
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QuoteOriginally posted by -spam- Quote
Wouldnt make a difference, your k100d would still be driving it with the screwdriver AF as it doesnt support SDM. Unless its a k100d super that you have
I thought the k100d supported the high speed motor. So
(1) Is it only the k100d super or does the k10d have support for high speed?

(2) Does the new 60-250mm coming with high speed support?

(3) Is that 60-250 ever going to be released.?

I'd rather invest in the pentax lens but I also have a Canon 350 with a canon100m macro & kit lens. But I much prefer the k100d, dont even know why. So I'm still considering going for that canon70-200mm f2.8L.
11-01-2007, 05:28 PM   #7
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The K10D and the K100D Super are the only two bodies that support the Pentax SDM in-lens motor. Any other body would use the screw-drive focus mechanism (motor in body).

Honestly, if you have a Canon 350, I'd buy one of their 70-200mm (IS no IS, f/2.8 or f/4) lenses. This is one area (long and fast lenses) where Pentax support is lacking.
11-01-2007, 07:15 PM   #8
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QuoteOriginally posted by egordon99 Quote
The K10D and the K100D Super are the only two bodies that support the Pentax SDM in-lens motor. Any other body would use the screw-drive focus mechanism (motor in body).

Honestly, if you have a Canon 350, I'd buy one of their 70-200mm (IS no IS, f/2.8 or f/4) lenses. This is one area (long and fast lenses) where Pentax support is lacking.
I konw wat u mean. After using the 100mmmacro with the USM, Its hard to go back to slow motors. The autofocus on that lens is incredible. Wish Pentax would stepup.

11-02-2007, 06:32 AM   #9
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I've got the DG version and it's faster than most AF lenses because the focus ring is decoupled from the focus mechanism during AF (NOT quickshift. the focus ring has 2 settings on the lens itself). Means you have to change to MF on both lens and body. Anyway, yeah they're very hard to find.

I tried a Nikon D80 with 70-200 AF-S once and was amazed by the speed. Oh well.
11-02-2007, 06:34 AM   #10
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Ive been looking for one of these on ebay for a while. they show up ever once in a while, just gotta convice my dad i really need this....:P
11-02-2007, 08:12 AM   #11
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I think you are misinterpreting what the benefits of SDM are. The SDM motors in the 2 lenses released so far are smooth and quiet, but the consensus of the current owners is that they are no faster than the K10D in body motor ( or maybe a bit faster). It should be considerably faster then the K100D in body motor, but as pointed out else where in this thread, the K100D does not support SDM, you would need to upgrade to a K100D super.

Just to add, I've also the non DG 70-200. It focuses very quickly on the K10, and a bit slower on the DS, but it still pretty quick. The K100D focus speed should be in between the 2.

You can not really compare Sigma's EX pro line with the consumer line to which your 70-300 belongs. The EX line are far superior in build and optics.
11-02-2007, 08:34 AM   #12
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QuoteOriginally posted by roscot Quote
You can not really compare Sigma's EX pro line with the consumer line to which your 70-300 belongs. The EX line are far superior in build and optics.
So is the Human Eye, Brain, and Hands Pathway. They function as one. Manual and you'll be dead on.

AF lenses, you camera makes the decision for you and if its wrong, its wrong and the added time needed for AF reacquisition may easily be longer than you making a slight twist on the manual focus barrel. (you'd have to switch the camera off AF mode unless you are using the DA*50-135)
11-02-2007, 08:48 AM   #13
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QuoteOriginally posted by FotoPete Quote
So is the Human Eye, Brain, and Hands Pathway. They function as one. Manual and you'll be dead on.

AF lenses, you camera makes the decision for you and if its wrong, its wrong and the added time needed for AF reacquisition may easily be longer than you making a slight twist on the manual focus barrel. (you'd have to switch the camera off AF mode unless you are using the DA*50-135)
You are right and wrong at the same time, especially comparing MF and AF speed and accuracy.

While it is true that aquisition time may be longer at times with AF because it guesses wrong on which way to start focusing, unless your lens is specifically designed for manual focus, the precision of manual focus will generally be worse than auto focus on the AF lens.

As a comparison, and I have posted this before, each lens (type and manufaturer) is different in terms of the rotation of the focusing collar between minimum distance and infinity. note the following:

My Sigma 70-200 f2.8 has 90 degrees between min focus and infinity
My Vivitar S1 70-210 F3.5 has 180 degrees between min focus and infinity
My SMC-P 300 F4 has 270 degrees between min focus and infinity
My Vivitar 400 f5.6 has 330 degrees between min focus and infinity

I would be willing to bet that I can get consistently better focus on any of my true manual focus lenses lenses than my sigma AF zoom, only because the larger angular rotation of the focusing collar makes it easier to be exact. The trade off in manual focus mode with the sigma, is that with a 1/4 turn you can get close (but not exact) quickly. Exact, without AF would be inconsistent at best
11-02-2007, 01:42 PM   #14
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All of that said. At this time I still cant find the sigma in stock anywhere and i'm not going to bid on a second hand lens. I want a new lens and I dont know if the pentax60-250 will come out in my lifetime. So it looks like canon about now.
11-02-2007, 01:56 PM   #15
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You've got to do what is right for your situation. If that means a move to Canon or Nikon then, that's what you need to do. Best of Luck to you in what ever you decide.
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