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08-10-2013, 06:04 AM   #1
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F4 and indoor sports

How big of a difference would going from a 2.8 to f4 make with indoor sports?
Typical lighting conditions would be f2.8 1/125-1/250 with ISO 3200 on the k5iis

Thanks

Randy

08-10-2013, 06:50 AM   #2
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If that's what you're shooting at and want the same exposure, you would bump your ISO to 6400. You could lower your shutter instead, but unless it's chess your shooting, you'll get motion blur.
08-10-2013, 06:54 AM   #3
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Double the ISO at f4. Awfully slow shutter for sport photography though. This is why I have a 70-200/2.8, a 50/1.4, and a 35/2.4.
08-10-2013, 07:52 AM   #4
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Well, it all depends. I use a F2.8 for most of my sports stuff but many of my shots are are at F3.5-4 mostly due to wanting more depth of field. I don't know how the AF will react though with an even slower lens in bad lighting. Though I've used my DA* 300/4 a couple of times with nice results.

08-10-2013, 09:04 AM   #5
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Thanks everyone

I think I will keep my Sigma 70 - 200 f2.8

Cheers

Randy
08-10-2013, 01:37 PM   #6
mee
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QuoteOriginally posted by slip Quote
Thanks everyone

I think I will keep my Sigma 70 - 200 f2.8
If you get super curious you could also experiment/approximate by using your sigma lens, setting the camera to a fixed f/4 and seeing how well it goes..

and shoot in RAW mode
08-10-2013, 01:44 PM   #7
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QuoteOriginally posted by mee Quote
If you get super curious you could also experiment/approximate by using your sigma lens, setting the camera to a fixed f/4 and seeing how well it goes..

and shoot in RAW mode
Though, that won't affect the AF as a F4 lens would. THough as I said before, I've used my 300/4 for indoor sports.
08-10-2013, 05:09 PM   #8
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Extender?

Hi Randy,
Another option might be to try a good-quality 1.4- 1.5 tele extender. This should put the Sigma at 300mm (roughly) and f/4.0. If you're only going to use the longer range occasionally, it might be the most cost-effective way to increase the range, and would be a lot more portable!
Ron


Last edited by rbefly; 08-10-2013 at 05:18 PM.
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