View previous topic :: View next topic |
Author |
Message |
quidam
Joined: 28 Sep 2012 Posts: 223 Location: Belgium
|
Posted: Tue Aug 20, 2024 7:06 pm Post subject: SMC Pentax - K 30mm/2.8 |
|
|
quidam wrote:
Some shots of the flower carpet on the Grand Place last weekend.
#1
#2
#3
#4
#1
_________________ Sony Nex 5 & 6, Sony A7II. |
|
Back to top |
|
|
BrianSVP
Joined: 09 Jun 2023 Posts: 335 Location: Philadelphia
|
Posted: Thu Aug 22, 2024 4:32 am Post subject: |
|
|
BrianSVP wrote:
One of the few K lenses I've never tried. Great looking images.
What do you think of the oddball focal length? |
|
Back to top |
|
|
caspert79
Joined: 31 Oct 2010 Posts: 3132 Location: The Netherlands
|
Posted: Thu Aug 22, 2024 6:01 am Post subject: |
|
|
caspert79 wrote:
Interesting lens, never tried one.
EDIT: strangely enough, the images don't look sharp @ full size. Could this be an upload problem? |
|
Back to top |
|
|
Ultrapix
Joined: 06 Jan 2012 Posts: 566 Location: Italy
|
Posted: Thu Aug 22, 2024 11:35 am Post subject: |
|
|
Ultrapix wrote:
caspert79 wrote: |
Interesting lens, never tried one.
EDIT: strangely enough, the images don't look sharp @ full size. Could this be an upload problem? |
Same here |
|
Back to top |
|
|
quidam
Joined: 28 Sep 2012 Posts: 223 Location: Belgium
|
Posted: Thu Aug 22, 2024 1:29 pm Post subject: |
|
|
quidam wrote:
caspert79 wrote: |
EDIT: strangely enough, the images don't look sharp @ full size. Could this be an upload problem? |
This must be an upload problem. My shots are sharp, even at full size. _________________ Sony Nex 5 & 6, Sony A7II. |
|
Back to top |
|
|
BrianSVP
Joined: 09 Jun 2023 Posts: 335 Location: Philadelphia
|
Posted: Thu Aug 22, 2024 1:29 pm Post subject: |
|
|
BrianSVP wrote:
caspert79 wrote: |
Interesting lens, never tried one.
EDIT: strangely enough, the images don't look sharp @ full size. Could this be an upload problem? |
Hmm, yeah, pixel peeping at the full sized, they do look rather front-focused, with the flowers in the front sharper and the buildings slightly out of focus. They also almost look like they might have some rather heavy NR applied, but judging by the EXIF, this is on an A7ii at ISO100 at 1/800 sec, so I guess not?
I've never shot with an A7ii - do they have the thicker sensor glass that is known to cause problems with vintage wides? |
|
Back to top |
|
|
caspert79
Joined: 31 Oct 2010 Posts: 3132 Location: The Netherlands
|
Posted: Thu Aug 22, 2024 4:49 pm Post subject: |
|
|
caspert79 wrote:
BrianSVP wrote: |
caspert79 wrote: |
Interesting lens, never tried one.
EDIT: strangely enough, the images don't look sharp @ full size. Could this be an upload problem? |
Hmm, yeah, pixel peeping at the full sized, they do look rather front-focused, with the flowers in the front sharper and the buildings slightly out of focus. They also almost look like they might have some rather heavy NR applied, but judging by the EXIF, this is on an A7ii at ISO100 at 1/800 sec, so I guess not?
I've never shot with an A7ii - do they have the thicker sensor glass that is known to cause problems with vintage wides? |
I’m pretty sure this is not the lens or the camera. I’ve used the first Sony A7 with wide angles without issues. |
|
Back to top |
|
|
quidam
Joined: 28 Sep 2012 Posts: 223 Location: Belgium
|
Posted: Thu Aug 22, 2024 8:18 pm Post subject: |
|
|
quidam wrote:
The problem that the shots do not appear sharp at full size has nothing to do with the lens or the camera. My shots are sharp and this is an excellent lens for the Sony A7 II. I had, and still do, problems with uploading photos to this website. I regularly get the error message 410 page. What the cause is, remains a mystery to me. _________________ Sony Nex 5 & 6, Sony A7II. |
|
Back to top |
|
|
kiddo
Joined: 29 Jun 2018 Posts: 1221
|
Posted: Thu Aug 22, 2024 9:41 pm Post subject: |
|
|
kiddo wrote:
i would like to see these shots on full res , there are are some other sites to upload files and share link, nice place anyway |
|
Back to top |
|
|
BrianSVP
Joined: 09 Jun 2023 Posts: 335 Location: Philadelphia
|
Posted: Fri Aug 23, 2024 1:44 pm Post subject: |
|
|
BrianSVP wrote:
quidam wrote: |
The problem that the shots do not appear sharp at full size has nothing to do with the lens or the camera. My shots are sharp and this is an excellent lens for the Sony A7 II. I had, and still do, problems with uploading photos to this website. I regularly get the error message 410 page. What the cause is, remains a mystery to me. |
kiddo wrote: |
i would like to see these shots on full res , there are are some other sites to upload files and share link, nice place anyway |
These shots, if you click on them are full res. The Sony A72, which these were taken on, outputs images at 6000x4000. And if you click on these images and view the large size, they are .... 6000x4000.
While they may be recompressed, which can degrade quality a bit, the main problem is quite obviously that all except for pic 3, which I suspect was taken at a smaller aperture, are front focused.
Here's a 100% crop from the flowers at the foreground of pic 1, which has reasonably sharp edges, despite being located fairly close to the edge of the frame:
And here's the crowd on the balconies of the building in the background, which is obviously out-of-focus:
And more examples from pic 4:
Folks in front, focused:
Crane in background, not focused:
No need for anyone to get defensive or blame the forum. It's probably just an adapter that is slightly out-of-registration.
Also, incidentally, an error 410 wouldn't have anything to do with the quality of an uploaded image. It's a standard HTML error code that is just saying a resource is unavailable, i.e. the server can't find the correct page/asset to display. Whatever back-end codec the site uses to recompress/resize images wouldn't be affected either way. |
|
Back to top |
|
|
D1N0
Joined: 07 Aug 2012 Posts: 2530
|
Posted: Fri Aug 23, 2024 9:33 pm Post subject: |
|
|
D1N0 wrote:
I have this lens. Plenty sharp. This was taken on my K-1 at F11 (scaled down for flickr)
Same image but hosted not here, but on Flickr
Street View by The lens profile, on Flickr
Clearly the flickr image is less compressed, but not to the amount it would look very unsharp. _________________ pentaxian |
|
Back to top |
|
|
quidam
Joined: 28 Sep 2012 Posts: 223 Location: Belgium
|
Posted: Fri Aug 23, 2024 9:53 pm Post subject: |
|
|
quidam wrote:
BrianSVP wrote: |
It's probably just an adapter that is slightly out-of-registration. |
I think you are right and that the cause of my problem is due to the adapter. I mounted another adapter and took the following picture taken at f11. In my opinion the focus is much better.
_________________ Sony Nex 5 & 6, Sony A7II. |
|
Back to top |
|
|
Noritar
Joined: 25 Jul 2024 Posts: 20
|
Posted: Fri Aug 23, 2024 10:34 pm Post subject: |
|
|
Noritar wrote:
These are a fun focal length. I'm certain this lens existed only so that Pentax marketing could say they had 20, 30, 40, and 50 available, followed by 100, 200, 300, etc. |
|
Back to top |
|
|
caspert79
Joined: 31 Oct 2010 Posts: 3132 Location: The Netherlands
|
Posted: Sat Aug 24, 2024 4:46 am Post subject: |
|
|
caspert79 wrote:
quidam wrote: |
BrianSVP wrote: |
It's probably just an adapter that is slightly out-of-registration. |
I think you are right and that the cause of my problem is due to the adapter. I mounted another adapter and took the following picture taken at f11. In my opinion the focus is much better.
|
Much better! |
|
Back to top |
|
|
kiddo
Joined: 29 Jun 2018 Posts: 1221
|
Posted: Sat Aug 24, 2024 5:03 pm Post subject: |
|
|
kiddo wrote:
i see it focused on close distance but infinity i don´t see details; unless is a upload issue, there might be a problem with the lens or the adapter (if there would be adapter problem, you could try another lens on the same adapter to see results for infinity) - but if you say on your pc you can see details on infinity or medium distance, maybe uploading through another site would give some better results |
|
Back to top |
|
|
Lida
Joined: 13 May 2015 Posts: 8
|
Posted: Tue Aug 27, 2024 8:02 pm Post subject: |
|
|
Lida wrote:
I have this lens, the M series 28mm f2.8 V1 and the K series 28mm f3.5. My experience with it is that it is not *really* worth the price - there’s no improvement in IQ over my sample of the M series 28mm. If anything, it’s not as sharp.
Not to say it’s a bad lens by any stretch of the imagination however. I particularly enjoy it for close up images. |
|
Back to top |
|
|
D1N0
Joined: 07 Aug 2012 Posts: 2530
|
Posted: Wed Aug 28, 2024 11:42 am Post subject: |
|
|
D1N0 wrote:
I think it is a great modern rendering lens. The prices are higher because it has a collector value, since not many were made like the Pentax-m 28/2.8 (which is under valued because it is so ubiquitous). _________________ pentaxian |
|
Back to top |
|
|
pepperberry farm
Joined: 02 Jan 2017 Posts: 40
|
Posted: Mon Sep 02, 2024 2:54 pm Post subject: |
|
|
pepperberry farm wrote:
I love my copy of the K30/2.8....
https://www.flickr.com/photos/pepperberryfarm/albums/72177720296265142/ |
|
Back to top |
|
|
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
|