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05-23-2016, 01:08 PM   #1
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sports tracking wide open?

this might sound like an overlap posting but it's not. I see some great shots but most of them are at small F stops like F7, F8 etc. with this small of and F stop the depth of field is so large that it is almost an exercise in shutter speed then autofocus tracking.
could we please see some examples of tracking wide open, or close to it?

thanks

Randy

05-23-2016, 01:28 PM   #2
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https://www.facebook.com/Olexi-Photography-142238982536887/photos/?tab=album...44862005607909

There's a load of examples there of shooting indoor in low light with f/2.8 nearly all the time on the 50-135 which is a pain to focus with, very slow. It's still quite serviceable. Not great but not a deal breaker. Certainly wouldn't want to shoot professionally with it though, at least not for this situation. Other than low light sports shooting it's a great lens, but low light action is really demanding on any camera.

Edit: Some are on the 16-50 and 50/1.8 too. A lot are out of focus but in there because they're the best of a bad bunch, it's not the best example but it does highlight the shortfall of this particular camera/lens combination. This is using continuous 9-point pattern AF with medium tracking.

Last edited by Mareket; 05-23-2016 at 01:35 PM.
05-23-2016, 01:41 PM   #3
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QuoteOriginally posted by Mareket Quote
https://www.facebook.com/Olexi-Photography-142238982536887/photos/?tab=album...44862005607909

There's a load of examples there of shooting indoor in low light with f/2.8 nearly all the time on the 50-135 which is a pain to focus with, very slow. It's still quite serviceable. Not great but not a deal breaker. Certainly wouldn't want to shoot professionally with it though, at least not for this situation. Other than low light sports shooting it's a great lens, but low light action is really demanding on any camera.

Edit: Some are on the 16-50 and 50/1.8 too. A lot are out of focus but in there because they're the best of a bad bunch, it's not the best example but it does highlight the shortfall of this particular camera/lens combination. This is using continuous 9-point pattern AF with medium tracking.
your link is dead. thanks

Randy
05-23-2016, 02:07 PM   #4
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There's a handful here:
Smc PENTAX-DA* 50-135mm F2.8 ED [IF] SDM and PENTAX K-3 | Sample Photos for Pentax Cameras & Lenses - PentaxForums.com


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05-23-2016, 02:54 PM   #5
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In defence of f8 ... when sports shooting, there are a lot of good reasons to shoot f8 (and smaller). Lenses perform best optically stopped down, particularly at the edges, and sometimes the extra DOF (eg at medium telephoto like 70-200mm) means you may get (for example) more useful details or context in the scene. f2.8, f1.8 etc can be useful in low-light, but reality isn't flat, and subjects don't always move in perfectly straight lines directly in front of your camera either.

Plus a lot of sports shooting is with long telephoto. At 300 - 500mm+, f8 doesn't really give you much extra DOF. And with some long lenses, f8 is just one stop above wide-open anyhow.
05-23-2016, 06:12 PM   #6
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the tamron 17-50 is fast focus at 2.8 you may want to try that one if you need quick focus with aps-c
05-23-2016, 06:14 PM   #7
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QuoteOriginally posted by HudsonShooter Quote
the tamron 17-50 is fast focus at 2.8 you may want to try that one if you need quick focus with aps-c
thanks. I used to own one but didn't care much for the build quality and sold it

Randy
05-23-2016, 07:12 PM   #8
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QuoteOriginally posted by slip Quote
this might sound like an overlap posting but it's not. I see some great shots but most of them are at small F stops like F7, F8 etc. with this small of and F stop the depth of field is so large that it is almost an exercise in shutter speed then autofocus tracking.
could we please see some examples of tracking wide open, or close to it?

thanks

Randy
There was a good thread on this last year, which I see you posted in too so probably you remember it? https://www.pentaxforums.com/forums/172-pentax-k-3/305681-increasing-af-speed...ware-both.html
There is a sequence of a basketball player running towards the camera at f2.8 on the first page. Also awaldram gives a nice explanation that AF-C tracking relies on distinguishing the subject (keep in focus) from the out of focus background so tracking should work best with small f numbers.

05-25-2016, 10:16 AM   #9
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QuoteOriginally posted by rfg Quote
There was a good thread on this last year, which I see you posted in too so probably you remember it? https://www.pentaxforums.com/forums/172-pentax-k-3/305681-increasing-af-speed...ware-both.html
There is a sequence of a basketball player running towards the camera at f2.8 on the first page. Also awaldram gives a nice explanation that AF-C tracking relies on distinguishing the subject (keep in focus) from the out of focus background so tracking should work best with small f numbers.
after 10 years and over 3,000 post it is hard for me to remember Thanks for the link


Randy
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