Pentax K1 at APSC use

using APSC lens the 12-24mm will functions like composition adjustment  and pixel shift still work

The 12-24mm will work fully with a k-1. It just won't cover the full frame, though it will come close at around 20mm.

Larry

Plakanina wrote:

using APSC lens the 12-24mm will functions like composition adjustment and pixel shift still work

I use my DFA 28-105 a lot in APSC mode if I need a little more reach on the long end that equals 157.5 mm in APSC terms, with some really good results . But you will loose the full sensor resolution. You end up with about 15 megapixel.  So any APSC lens will work on the  K-1

Ulrich

Plakanina wrote:

using APSC lens the 12-24mm will functions like composition adjustment and pixel shift still work

Just use FF mode and crop if and when required to your liking, many DA lenses will go bigger than the crop mode.

For example, the HD DA 20-40 f2.8-f4 Limited works on full frame from 23mm-37mm without hard vignetting and the IQ is amazing. Therefore you'll get more out of your DA lenses although some like the DA15 not so much.

PentaxForums has a FF compatibility chart for every DA lens grading them from A - D, even zooms at varying focal lengths.

😉

Oiche is right . But one thing I noticed with my Sigma 10-30 mm in full frame mode it covers the field of view from 17mm-20mm but the corner sharpness and distortion are terrible. So better stick with Pentax DA lenses.

Ulrich

Oiche wrote:

Plakanina wrote:

using APSC lens the 12-24mm will functions like composition adjustment and pixel shift still work

Just use FF mode and crop if and when required to your liking, many DA lenses will go bigger than the crop mode.

For example, the HD DA 20-40 f2.8-f4 Limited works on full frame from 23mm-37mm without hard vignetting and the IQ is amazing. Therefore you'll get more out of your DA lenses although some like the DA15 not so much.

PentaxForums has a FF compatibility chart for every DA lens grading them from A - D, even zooms at varying focal lengths.

😉

Super. Now the 12-24mm seems ok at 18mm and 23mm is this in full frame terms? 18mm in APSC is about 27mm in full frame equivalent.

Plakanina wrote:

using APSC lens the 12-24mm will functions like composition adjustment and pixel shift still work

The only advantage of APS-C mode in K1 is higher burst rate and smaller image sizes. If this is not critical for your work, I would shoot in FF mode and crop afterwards.

Best regards

Holger

Plakanina wrote:

Oiche wrote:

Plakanina wrote:

using APSC lens the 12-24mm will functions like composition adjustment and pixel shift still work

Just use FF mode and crop if and when required to your liking, many DA lenses will go bigger than the crop mode.

For example, the HD DA 20-40 f2.8-f4 Limited works on full frame from 23mm-37mm without hard vignetting and the IQ is amazing. Therefore you'll get more out of your DA lenses although some like the DA15 not so much.

PentaxForums has a FF compatibility chart for every DA lens grading them from A - D, even zooms at varying focal lengths.

😉

Super. Now the 12-24mm seems ok at 18mm and 23mm is this in full frame terms? 18mm in APSC is about 27mm in full frame equivalent.

Yes 23mm - 37mm on FF without hard vignetting, you will still have normal vignetting and more pronounced than a FF lens and varies with focal length and aperture. I think 30mm is the best FF coverage bang in the middle of the zoom range and obviously stopping down helps get rid of normal vignetting too. You probably will have to crop slightly to get totally rid of vignetting too depending on focal length.