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11-26-2013, 01:25 PM   #1
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Fast AF

I have a DA 55-300, but I need a faster AF for soccer games to use with my K 5IIs.

I think that the faster is Sigma 70-200 2.8, then 140-400, 150-500 and the slowest one 50-500. I'm right?

All of them are faster then the Pentax lens? I need a long zoom too.

11-26-2013, 02:22 PM   #2
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Sigma 70-200/2.8 is probably the fastest lens, 'cause it has HSM drive focusing. Their is also another fast lens, Tamron 70-200/2.8, but has screw drive focus, and is a little slower.

Last edited by JimmyDranox; 11-26-2013 at 02:29 PM.
11-26-2013, 02:32 PM   #3
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QuoteOriginally posted by Nenix Quote
I have a DA 55-300, but I need a faster AF for soccer games to use with my K 5IIs.

I think that the faster is Sigma 70-200 2.8, then 140-400, 150-500 and the slowest one 50-500. I'm right?

All of them are faster then the Pentax lens? I need a long zoom too.
I'd also recommend the sigma 70-200mm. About as good as it gets for the K-mount.


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11-26-2013, 03:24 PM   #4
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QuoteOriginally posted by Nenix Quote
I think that the faster is Sigma 70-200 2.8, then 140-400, 150-500 and the slowest one 50-500. I'm right?
The Sigma 70-200/2.8 is consistently rated as the fastest sports zoom by K-5 and K-5 II/IIs shooters here on the forum, but you have to buy the latest model, which usually means buying new.


If you want a prime there are a number of models that work well. I use the FA*85, FA135, and F*300. Others report the DA*300 does well too. Avoid the DA*200 - nice lens, but AF is too slow, as I and others have learned from experience.


Read this thread to get a better idea of what to expect:

https://www.pentaxforums.com/forums/115-pentax-k-5/115277-k-5-sports-photography.html

11-26-2013, 04:38 PM   #5
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I just got the Sigma 70-200 yesterday and have not yet put it through the paces but just playing around it seems rather speedy, I have had the 50-500 for 2 years and its no slouch either.
11-26-2013, 05:43 PM   #6
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I'm looking to replace my 55-300 with a DA*60-260 for the same purpose.
11-26-2013, 05:47 PM   #7
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QuoteOriginally posted by Nenix Quote
Fast AF
I have a DA 55-300, but I need a faster AF for soccer games to use with my K 5IIs.

I think that the faster is Sigma 70-200 2.8, then 140-400, 150-500 and the slowest one 50-500. I'm right?

All of them are faster then the Pentax lens? I need a long zoom too.
Hi Nenix,
I too have used a K5iis for my son's soccer. The zooms I have used are as follows

DA 18-135 DC
Sigma 70 - 200 HSM (latest variant)
Sigma 120 - 400 HSM
DA* 50 - 135

And that order is based on the fastest focusing at the top
For ultimate IQ order from bottom up

Last edited by ak_kiwi; 11-26-2013 at 07:59 PM.
11-27-2013, 06:41 AM   #8
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QuoteOriginally posted by twitch Quote
I'm looking to replace my 55-300 with a DA*60-260 for the same purpose.
The Sigma 70-200 is indeed faster, as many have pointed out. But the 60-250 will be a significant upgrade in itself.

I would ask this question : does the OP need the fastest lens? If so, then the Sigma is the best choice. But if the OP needs a faster lens, then the 60-250 is a valid choice : longer range of focal length, lighter, smaller, better built (though the Sigma is fine), better designed, less optical flaws from what I have seen (though the Sigma is fine).

11-27-2013, 08:30 AM   #9
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Here is another question PM'd to me -
"No to doubt you but I just need to verify again that da 18-135 is faster than sigma 70-200? wow.. what about 18-250?"

Yes the focusing DA18-135 is slightly quicker to focus than the 70 -200 but there are other differences that matter also.
For sports shooting 135mm is a bit short when shooting the action from the sideline.(But using 18 - 50mm range on the DA18-135 mm is great for half time "huddles" for sideline shooting) The DA18-135mm is also weather resistant (WR).
The 70 - 200 Sigma is a faster lens in terms of aperture which allows a lower ISO to be selected on the camera for a given shutter speed. The larger aperture availability on the 70-200 also gives a shorter depth of field which is beneficial in isolating the subject by putting the background out of focus.
I personally cannot comment on the focusing speed of the DA18-250 since I have not used it. Some reviews on this lens by other members suggest that the lens hunts in low light. and/or is "a little slow".

The DA18-135, DA18-250 and Sigma 120-400 are lenses more suited to optimum lighting conditions as they are limited in aperture.
The DA*50-135 is a very good lens for image quality but will sometimes miss shots due to its slower focusing speed.

Focusing speed of lenses is also determined by what camera you are using.
The latest K3 camera is superior to the K5 variants when it comes to focus tracking/locking. It is also slightly faster with the larger screw drive lenses when having to run through the focus throw of a lens.

Also it is important to note the difference between a lens that is "fast" because of it's focus speed (which the OP was asking about) and the how "fast" a lens is when you are talking about maximum available aperture.
Ideally for sports shooting you want both.
11-28-2013, 01:29 AM   #10
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Hmmm...does this mean that da 18-135 lens has fastest af than any other lens?
11-28-2013, 08:21 AM   #11
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Now I really don't know what to do.

Yesterday I've checked my exif file and found it that most pictures were taking around 300mm of focal lenght. The question is: the AF of Sigma 120-400 or 150-500 are better then Pentax 55-300? The Sigma 70-200 is quite expensive, of course, and it's to short.
11-28-2013, 09:25 AM   #12
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QuoteOriginally posted by Joojoo2010 Quote
Hmmm...does this mean that da 18-135 lens has fastest af than any other lens?
Not trying to be cute but I think that would be a hard question to answer. It is better to compare the DA18 - 135 to a specific lens.

QuoteOriginally posted by Nenix Quote
Now I really don't know what to do.

Yesterday I've checked my exif file and found it that most pictures were taking around 300mm of focal lenght. The question is: the AF of Sigma 120-400 or 150-500 are better then Pentax 55-300? The Sigma 70-200 is quite expensive, of course, and it's to short.
Amazon have the Sigma 18 - 250? HSM in K mount at around $350 ish if that helps.?

Found it - Amazon.com: Sigma 18-250mm f/3.5-6.3 DC OS HSM IF Lens for Pentax Digital SLR Cameras: Camera & Photo
11-28-2013, 11:04 AM   #13
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Sigma 70-200 with a 1.4X teleconverter? That would give you a 98 to 280 F4.0 that focuses fast. You could also use it without the converter when you need speed.
11-28-2013, 11:43 AM   #14
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QuoteOriginally posted by pentaxman Quote
Sigma 70-200 with a 1.4X teleconverter? That would give you a 98 to 280 F4.0 that focuses fast. You could also use it without the converter when you need speed.
And is possible with 2.0X teleconverter? It will became like 120-400? Same speed and same aperture?
11-28-2013, 02:15 PM   #15
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QuoteOriginally posted by Nenix Quote
Same speed and same aperture?
The aperture will be two stops slower with a 2x TC. The AF speed will be slower also, either because the TC is doing the AF or because less light reaches the AF sensor.
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