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DA 17-70 vs DFA 28-105

sebas77
Posted 16/02/2017 - 10:02 Link
Does anyone know how they compare against each other? I am just curios to know how the DFA performs against a lens I know already.
johnriley
Posted 16/02/2017 - 10:08 Link
I've reviewed both for EPZ and the 28-105mm I found to be a much better lens.
Best regards, John
JAK
Posted 16/02/2017 - 12:29 Link
Isn't that a bit like comparing apples with oranges? One's an APS-C lens, the other is full frame. Either would be best for its intended purpose. On APS-C you couldn't achieve 17mm with a 28mm lens. On FF the 17mm will vignette.
John K
Mike-P
Posted 16/02/2017 - 12:48 Link
I must admit I have been toying with the idea of making an offer on McBrians 16-85mm and selling my 17-70mm but I have taken some of my best pictures with the older lens and I like the constant aperture.
johnriley
Posted 16/02/2017 - 13:05 Link
JAK wrote:
Isn't that a bit like comparing apples with oranges? One's an APS-C lens, the other is full frame. Either would be best for its intended purpose. On APS-C you couldn't achieve 17mm with a 28mm lens. On FF the 17mm will vignette.

I think of it as comparing two standard zooms, each in relation to its own format, which I do feel is a valid comparison.
Best regards, John
sebas77
Posted 16/02/2017 - 13:32 Link
johnriley wrote:
I've reviewed both for EPZ and the 28-105mm I found to be a much better lens.

woah thanks, I will consider to buy it then.
sebas77
Posted 16/02/2017 - 13:34 Link
JAK wrote:
Isn't that a bit like comparing apples with oranges? One's an APS-C lens, the other is full frame. Either would be best for its intended purpose. On APS-C you couldn't achieve 17mm with a 28mm lens. On FF the 17mm will vignette.

in a given sense you are right, but it's still possible to compare the quality of the FF image against the cropped one, just to have an idea.
JAK
Posted 16/02/2017 - 15:34 Link
For APS-C don't discount the 16-85 as its a more recent fine lens too with a wider range.
As to the other point, the 17-70 on APS-C is a wide to moderate telephoto, whereas the 28-105 is a standard to medium telephoto so they are not directly comparable IMO. Probably worth having both!
Alternatively look at the 18-135mm.
John K
Edited by JAK: 16/02/2017 - 15:41
HarisF1
Posted 16/02/2017 - 16:16 Link
The 28-105 on the K-1 would be much nicer than a 17-70 on the K-3 in terms of sharpness and depth of field (the D-FA feels like a 17-70 f/2.8 - 4 lens if you're used to APS-C).

The field of view of both lenses on their respective systems is the same.

If used on APS-C then I would look at the 16-85 as it has a more useful range.
All the gear with no idea
sebas77
Posted 16/02/2017 - 16:50 Link
I want a comparison of the DFA on the K1 with the 17-70 on a cropped sensor. You answered my question overall. Thank you.

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