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11-22-2017, 03:25 PM   #1
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HD D FA 24-70 f2.8 vs HD D FA 28-105 Low Light AF

Bismillah

Can anyone tell me which of these 2 focuses better in extreme low light like that in a club, bar, for shooting people for candits and for music performers.

Or if you have a better recommendation for a FA Zoom or prime for my K1. I have a Tamron 28-75 and Pentax 50 1.4 and I'm not too pleased with their AF in these conditions. Thanks.

11-22-2017, 03:33 PM   #2
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I haven't yet used my DFA28-105 in such situations, but I've been very happy with the DFA24-70 for low lit indoor events.
11-22-2017, 04:13 PM   #3
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QuoteOriginally posted by Sandy Hancock Quote
I haven't yet used my DFA28-105 in such situations, but I've been very happy with the DFA24-70 for low lit indoor events.
Have you shot in conditions with ev underexposed?
11-22-2017, 04:44 PM   #4
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QuoteOriginally posted by halimj7 Quote
Bismillah

Can anyone tell me which of these 2 focuses better in extreme low light like that in a club, bar, for shooting people for candits and for music performers.

Or if you have a better recommendation for a FA Zoom or prime for my K1. I have a Tamron 28-75 and Pentax 50 1.4 and I'm not too pleased with their AF in these conditions. Thanks.
The narrower aperture of the 28-105 means that it will have more trouble focusing in the dark than the 24-70. If you are zoomed in, the 28-105 is at f/5.6 while the 24-70 is still at f/2.8, which is 4x the amount of light making it to the focus sensors.

11-22-2017, 05:35 PM   #5
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QuoteOriginally posted by halimj7 Quote
Have you shot in conditions with ev underexposed?
I nearly always underexpose by about a stop.
11-22-2017, 11:45 PM   #6
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QuoteOriginally posted by enoeske Quote
The narrower aperture of the 28-105 means that it will have more trouble focusing in the dark than the 24-70. If you are zoomed in, the 28-105 is at f/5.6 while the 24-70 is still at f/2.8, which is 4x the amount of light making it to the focus sensors.
Bismillah

I usually shoot with flash at ISO 100-200 at 5.6 or higher f-stops so low apertures are not that important to me. Since I often underexpose 3-4 stops my current lenses struggle. I want the best lens at focusing in these conditions - any ideas?
11-23-2017, 01:21 AM   #7
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I have the 28-105, and it's fine in low light. I did some routine pictures of speakers in a meeting in a dark church, and the focus was good. Had to push the ISO up higher than I would normally to make up for the small aperture, but apart from that, good. Not used the 24-70, wish I could afford it, and the extra width would be great, too!

I had a look at the price online, and saw the Tamron 24-70 f2.8. Guess what? Not done in a Pentax mount. That's the ONLY snag with Pentax, not supported by many 3rd-party lenses.


Last edited by agp1337; 11-23-2017 at 01:42 AM.
11-23-2017, 04:24 AM   #8
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QuoteOriginally posted by agp1337 Quote
I have the 28-105, and it's fine in low light. I did some routine pictures of speakers in a meeting in a dark church, and the focus was good. Had to push the ISO up higher than I would normally to make up for the small aperture, but apart from that, good. Not used the 24-70, wish I could afford it, and the extra width would be great, too!

I had a look at the price online, and saw the Tamron 24-70 f2.8. Guess what? Not done in a Pentax mount. That's the ONLY snag with Pentax, not supported by many 3rd-party lenses.
Bismillah

Thanks for your response. Do you shoot underexposed and or with flash and if so by how many stops?

If you want a lens virtually as good as the Pentax 24-70 (which is essentially a Tamron anyway) check out the Tamron 28-75 di (full frame version) it is very close to if not equally as good optically for about a third of the price.
11-23-2017, 04:45 AM   #9
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QuoteOriginally posted by halimj7 Quote
I usually shoot with flash at ISO 100-200 at 5.6 or higher f-stops so low apertures are not that important to me. Since I often underexpose 3-4 stops my current lenses struggle. I want the best lens at focusing in these conditions - any ideas?
DFA24-70 without a doubt. That is exactly how I use it.
11-23-2017, 07:08 AM   #10
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Thanks Sandy. Do you have the 28-105? And if so have you tried it in these conditions?
11-23-2017, 10:46 AM   #11
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QuoteOriginally posted by halimj7 Quote
Bismillah

Thanks for your response. Do you shoot underexposed and or with flash and if so by how many stops?

If you want a lens virtually as good as the Pentax 24-70 (which is essentially a Tamron anyway) check out the Tamron 28-75 di (full frame version) it is very close to if not equally as good optically for about a third of the price.
Thanks. I've looked at this lens on your recommendation. I'll consider it for the larger aperture, but the range is contained within 28-105. Now if it was 24-75 ... still, food for thought.
11-23-2017, 10:59 AM   #12
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QuoteOriginally posted by agp1337 Quote
Thanks. I've looked at this lens on your recommendation. I'll consider it for the larger aperture, but the range is contained within 28-105. Now if it was 24-75 ... still, food for thought.
Bismillah

Glad the recommendation helped. It's a good lens cameraville on YouTube did a detailed comparison with it against the 24-70.

Question: Do you shoot underexposed and or with flash with the 28-105mm and if so by how many stops? Thanks.
11-24-2017, 02:32 AM   #13
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QuoteOriginally posted by halimj7 Quote
Thanks Sandy. Do you have the 28-105? And if so have you tried it in these conditions?
Yes, and no, in that order. As explicitly stated in my earlier post.
I'm dining out in Melbourne tonight, and have the DFA28-105 with me. I'll see what I can do.
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