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01-08-2016, 11:26 AM   #1
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24-70 vs 20-40

After a productive expansion into Fuji, having collected all their lenses, I've resumed my Pentax LBA after the FF news and upgrade to K-3II. First I got the 24-70 for FF, and then realized there's the 20-40. Does it make sense to get the 20-40 if I already have the 24-70?

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01-08-2016, 11:43 AM   #2
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I dont think the DA 20-40 Ltd is FF compatible.
01-08-2016, 11:45 AM   #3
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They are really different lenses. The 20-40 is a small, APS-C lens, while the 24-70 is a huge, full frame lens. I sort of view the 20-40 as a zoom that replaces the DA 21, DA 35, and DA 40, more or less, has nice colors and sharpness, but a very small form factor. It doesn't really over lap much with the 24-70 f2.8, except for the focal lengths.

It wouldn't be unreasonable to own both, if you are planning to continue shooting APS-C in the future.
01-08-2016, 12:03 PM   #4
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Well given I'm already carrying the 24-70, I guess I wouldn't need the 20-40 at the same time for APS-C. Sounds like the form factor is key value, so the main reason to carry 20-40 would be situations where I wouldn't take 24-70 along...

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01-08-2016, 12:07 PM   #5
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QuoteOriginally posted by braver Quote
Sounds like the form factor is key value, so the main reason to carry 20-40 would be situations where I wouldn't take 24-70 along...
The 20-40 is also WR. My normal zoom is the Sigma 17-50 f/2.8, but if I was going out in poor weather I'd fit the 20-40 instead...
01-08-2016, 01:05 PM - 1 Like   #6
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QuoteOriginally posted by braver Quote
I guess I wouldn't need the 20-40 at the same time for APS-C. Sounds like the form factor is key value
The "gentle" rendering of the DA 20-40 is what really singles it out for me.
01-08-2016, 01:29 PM - 1 Like   #7
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QuoteOriginally posted by BigMackCam Quote
The 20-40 is also WR. My normal zoom is the Sigma 17-50 f/2.8, but if I was going out in poor weather I'd fit the 20-40 instead...
The DFA 24-70 is weather sealed as well, for what it is worth.
01-08-2016, 01:41 PM   #8
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QuoteOriginally posted by Rondec Quote
The DFA 24-70 is weather sealed as well, for what it is worth.
Ah, I hadn't realised that - thanks

01-09-2016, 02:54 PM   #9
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Agree with lytrytyr. The 20-40 really stands out for the wonderful colors and rendering.
01-09-2016, 03:05 PM   #10
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QuoteOriginally posted by Brucie Quote
Agree with lytrytyr. The 20-40 really stands out for the wonderful colors and rendering.
It's interesting, isn't it? the 20-40 has never had outstanding reviews... at least, not regarding frame-wide IQ... but I also love the way it renders. Just shows that technical data, whilst useful, must be treated very carefully, and ultimately you can only judge a lens on the images it produces - not on the test charts
01-09-2016, 07:39 PM - 1 Like   #11
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It comes down to 24-70 being f2.8 constant and 20-40 being far smaller.
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