Minimum Focus Distance K-5 vs K-1
Posted 09/05/2023 - 10:10 - Helpful Comment
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Hi Kasper,
I have a K-1 and the HD version of the DA 1:2.8 35mm Macro Limited lens. A fantastic lens I used on my K-50 till that camera broke. I've just tried it on the K-1 in 'Full Frame' mode at the minimum focus distance, it works fine, there is some vignetting but aside from that is works well.
Attached is the image I took, partof your post, handheld at f5.6, I expect the degree of vignetting will vary with the f stop used.
Of course in 'Crop' mode there will be no vignetting.
Hope this helps.
Regards
Mike
I have a K-1 and the HD version of the DA 1:2.8 35mm Macro Limited lens. A fantastic lens I used on my K-50 till that camera broke. I've just tried it on the K-1 in 'Full Frame' mode at the minimum focus distance, it works fine, there is some vignetting but aside from that is works well.
Attached is the image I took, partof your post, handheld at f5.6, I expect the degree of vignetting will vary with the f stop used.
Of course in 'Crop' mode there will be no vignetting.
Hope this helps.
Regards
Mike
Posted 09/05/2023 - 16:24 - Helpful Comment
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The DA 35mm macro is designed for Pentax crop sensors, not full frame. However, as MikeInDevon has shown above, it will cover a full frame sensor but with light drop-off outside the area of the crop sensor. The minimum focus distance will not change, it is a property of the lens not the sensor or camera. So the alternatives with a K1 would be:
1. Use the full frame image and either put up with the drop-off or correct in post-processing.
2. Use the central, crop-sensor area of the image, either by in-camera 'crop mode' or by cropping in post-processing. The result will be the same as you would get with your current K5.
3. Acquire an FA 50mm f2.8 macro. This gives almost the same field of view with a full frame sensor as the DA 35mm gives with crop sensor (i.e. if something fills the frame on your K5 + DA 35mm at minimum focus distance, it will be close to filling the frame on a K1 + FA 50mm at minimum focus distance). The minimum focus distance will be a few cm greater, that is a consequence of the longer focal length and both lenses being designed so that minimum focus distance gives a 1:1 image.
Steve
1. Use the full frame image and either put up with the drop-off or correct in post-processing.
2. Use the central, crop-sensor area of the image, either by in-camera 'crop mode' or by cropping in post-processing. The result will be the same as you would get with your current K5.
3. Acquire an FA 50mm f2.8 macro. This gives almost the same field of view with a full frame sensor as the DA 35mm gives with crop sensor (i.e. if something fills the frame on your K5 + DA 35mm at minimum focus distance, it will be close to filling the frame on a K1 + FA 50mm at minimum focus distance). The minimum focus distance will be a few cm greater, that is a consequence of the longer focal length and both lenses being designed so that minimum focus distance gives a 1:1 image.
Steve
Posted 12/05/2023 - 13:56
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MikeInDevon wrote:
Hi Kasper,
I have a K-1 and the HD version of the DA 1:2.8 35mm Macro Limited lens. A fantastic lens I used on my K-50 till that camera broke. I've just tried it on the K-1 in 'Full Frame' mode at the minimum focus distance, it works fine, there is some vignetting but aside from that is works well.
Attached is the image I took, partof your post, handheld at f5.6, I expect the degree of vignetting will vary with the f stop used.
Of course in 'Crop' mode there will be no vignetting.
Hope this helps.
Regards
Mike
Hi Kasper,
I have a K-1 and the HD version of the DA 1:2.8 35mm Macro Limited lens. A fantastic lens I used on my K-50 till that camera broke. I've just tried it on the K-1 in 'Full Frame' mode at the minimum focus distance, it works fine, there is some vignetting but aside from that is works well.
Attached is the image I took, partof your post, handheld at f5.6, I expect the degree of vignetting will vary with the f stop used.
Of course in 'Crop' mode there will be no vignetting.
Hope this helps.
Regards
Mike
Hi Mark - thank you for your reply & insights. It's definitely helps!
Does the minimum focus distance change when switching from full-frame to crop-mode?
-- Kasper Bergholt
Posted 12/05/2023 - 13:58
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Lubbyman wrote:
The DA 35mm macro is designed for Pentax crop sensors, not full frame. However, as MikeInDevon has shown above, it will cover a full frame sensor but with light drop-off outside the area of the crop sensor. The minimum focus distance will not change, it is a property of the lens not the sensor or camera. So the alternatives with a K1 would be:
1. Use the full frame image and either put up with the drop-off or correct in post-processing.
2. Use the central, crop-sensor area of the image, either by in-camera 'crop mode' or by cropping in post-processing. The result will be the same as you would get with your current K5.
3. Acquire an FA 50mm f2.8 macro. This gives almost the same field of view with a full frame sensor as the DA 35mm gives with crop sensor (i.e. if something fills the frame on your K5 + DA 35mm at minimum focus distance, it will be close to filling the frame on a K1 + FA 50mm at minimum focus distance). The minimum focus distance will be a few cm greater, that is a consequence of the longer focal length and both lenses being designed so that minimum focus distance gives a 1:1 image.
Steve
The DA 35mm macro is designed for Pentax crop sensors, not full frame. However, as MikeInDevon has shown above, it will cover a full frame sensor but with light drop-off outside the area of the crop sensor. The minimum focus distance will not change, it is a property of the lens not the sensor or camera. So the alternatives with a K1 would be:
1. Use the full frame image and either put up with the drop-off or correct in post-processing.
2. Use the central, crop-sensor area of the image, either by in-camera 'crop mode' or by cropping in post-processing. The result will be the same as you would get with your current K5.
3. Acquire an FA 50mm f2.8 macro. This gives almost the same field of view with a full frame sensor as the DA 35mm gives with crop sensor (i.e. if something fills the frame on your K5 + DA 35mm at minimum focus distance, it will be close to filling the frame on a K1 + FA 50mm at minimum focus distance). The minimum focus distance will be a few cm greater, that is a consequence of the longer focal length and both lenses being designed so that minimum focus distance gives a 1:1 image.
Steve
Thank you for your reply - very helpful & it definitely makes sense.
I would have thought the full-frame lens would be more expensive than my current 35mm.
-- Kasper Bergholt
Posted 12/05/2023 - 14:38
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kasperbergholt wrote:
I would have thought the full-frame lens would be more expensive than my current 35mm.
I would have thought the full-frame lens would be more expensive than my current 35mm.
In the UK, the 50mm macro (full frame) is 33% cheaper than the 35mm macro (crop sensor). I have no idea why!
Steve
Posted 12/05/2023 - 15:19
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Lubbyman wrote:
In the UK, the 50mm macro (full frame) is 33% cheaper than the 35mm macro (crop sensor). I have no idea why!
Steve
kasperbergholt wrote:
I would have thought the full-frame lens would be more expensive than my current 35mm.
I would have thought the full-frame lens would be more expensive than my current 35mm.
In the UK, the 50mm macro (full frame) is 33% cheaper than the 35mm macro (crop sensor). I have no idea why!
Steve
Probably because they've made far more 50mm lenses than 35mm ones - the "benefits" of mass production of one lens that actually costs about the same to manufacture as another one of quite similar size & focal length but is sold in much fewer numbers?!
K-3 II, K-3 and a K-70 from SRS (having now relegated the K-30 /"K-50" to a backup body), & some Sigma and Pentax lenses (and a lot of old 35mm gear!)
Posted 12/05/2023 - 16:37
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50mm lenses seem cheaper generally, I guess it is to do with their glass configuration. The 50mm macro is a great lightweight lens for landscape, macro lenses tend to be sharpest at smaller apertures than conventional lenses in order to give increased depth of field in close-ups.
Posted 12/05/2023 - 19:28
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RobL wrote:
50mm lenses seem cheaper generally, I guess it is to do with their glass configuration. The 50mm macro is a great lightweight lens for landscape, macro lenses tend to be sharpest at smaller apertures than conventional lenses in order to give increased depth of field in close-ups.
50mm lenses seem cheaper generally, I guess it is to do with their glass configuration. The 50mm macro is a great lightweight lens for landscape, macro lenses tend to be sharpest at smaller apertures than conventional lenses in order to give increased depth of field in close-ups.
Wot Rob said....
...plus MPB have the FA version for £134: https://www.mpb.com/en-uk/product/pentax-fa-pentax-smc-p-d-50mm-f-2-8-macro if anyone is interested
LennyBloke
Posted 14/05/2023 - 16:23
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Hello again,
I've given it some thought over the weekend and done some research. I'm considering skipping the K1 and moving to the 645D instead.
I've created a new thread for this topic in the lenses section.
Thanks again for all the inputs
I've given it some thought over the weekend and done some research. I'm considering skipping the K1 and moving to the 645D instead.
I've created a new thread for this topic in the lenses section.
Thanks again for all the inputs
-- Kasper Bergholt
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72 posts
1 years
Copenhagen,
Denmark
The K-5 is in pretty bad shape, so I'm planning an upgrade to full frame. E.g. the Pentax K-1. Will the macro objective work fully on a full-frame camera? The minimum focus distance is around 14 centimeters on the K-5. Will that change if mounted on a K-1?
Thanks in advance,
Kasper