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02-26-2017, 03:50 AM   #1
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K1 with Sigma DC 18-250 Macro HSM

I'm looking to upgrade from my K3-II and I would like to keep my DC 18-250 as a walking around lens.

Anyone tried one of these on the K1?

02-26-2017, 04:16 AM   #2
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It will work.. using it at APC crop mode but not as a FF lens.
02-26-2017, 06:12 AM   #3
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I occasionally use my 18-250 Pentax DA on the K-1 in crop mode. You probably can get away with the 1:1 crop mode for a 24 Mp image using the Sigma. Be aware that through the viewfinder you will see a large vignetted image with a black box indicating crop mode. If you don't like this effect, you can use live view which works normally. Personally I am not a fan of crop mode as a general solution because of this effect which impacts composition in the viewfinder taking away one of the advantages of the DSLR.
02-26-2017, 06:28 AM   #4
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I suppose it should go without saying, but one always has the option to shoot in full frame mode then crop in post. There is no reason at all to be bound by the built in crop ratios.

02-26-2017, 06:56 AM   #5
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K-1 + DA18-135WR

18mm,f11

135mm,f11


left - FF mode and manualy crop in editor
right - APS-C mode in K-1
02-26-2017, 07:14 AM   #6
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The comparison between crop and crop seems to be somewhat ... futile.

More interesting would be a non-cropped FF image. Yes, that'll be with severe vignetting, but depending on the lens' construction and the focal length chosen, this could change, and there's even some chance for less vignetting with longer focal lenghts.

Could you post non-cropped FF images to compare them with APS-C crops?
02-26-2017, 11:48 AM   #7
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K1 + DA18-135WR


18mm f11 FF vs APS-C

135mm f11 FF vs APS-C



full size JPG
https://ulozto.sk/!ccrzkwq3vm9l/da18-135-k1-rar
02-26-2017, 12:03 PM   #8
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You're aware that you can post images as part of this forum without using external file sharing services?

02-26-2017, 12:48 PM   #9
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if the AF focus is correct, details are the same, from FF mode and APS-C mode.


attachment JPG can be maximum 1400x900 pix
Attached Images
 
02-26-2017, 12:49 PM   #10
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If that was the question, Sigma DC lenses are not usable in full frame mode at any focal length and any apperture.
You'll have to use crop mode.
02-26-2017, 01:01 PM   #11
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QuoteOriginally posted by lennyl Quote
attachment JPG can be maximum 1400x900 pix
Oh, that explains things. I might have been not to clear in my words. By "uncropped" I did not mean an image in the 100% camera resolution, but an image that shows the vignetting that you have removed, that is, the unuseable parts of the full frame image.
02-26-2017, 01:24 PM   #12
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if you want more examples, you can download full size JPGs from my previous post with FF mode vignetting and APS-C mode JPGs also.


i understand very well what you wrote. i want show the details in 1:1, thats all
for me is not APS-C/square mode solution, only a temporary solution who has not yet FF lenses


orignal APS-C lenses have brutal vignetting - for example DA15/4, DA18-135WR and others
02-26-2017, 01:35 PM   #13
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Comparing a manual crop (done in post-processing from a full-frame shot) to an in-camera crop is quite pointless, since the result is invariably the same.

Why the bother?
02-26-2017, 01:45 PM   #14
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The main thing is on the K-1, it's going to be a full frame equivalent of 12mm-175mm, even if you could use the full frame. With my 60-250 I can use it in FF mode, but it's distressing how much more field of view is involved if you're used to the crop FoV.
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