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Help with mount identification - Pentax K?
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PostPosted: Fri Jan 30, 2015 9:45 pm    Post subject: Reply with quote
Is this not why we LOVE MFlenses Very Happy


PostPosted: Fri Jan 30, 2015 11:42 pm    Post subject: Reply with quote
Damn, Sigma. Shocked I guess it might fit a PK mount if the diameters are about the same.


PostPosted: Sat Jan 31, 2015 6:39 am    Post subject: Reply with quote
Glad to help.
We really should put together a definitive lens mount ID thread.


PostPosted: Sat Jan 31, 2015 9:15 am    Post subject: Reply with quote
Lloydy wrote:
Damn, Sigma. Shocked I guess it might fit a PK mount if the diameters are about the same.

From what I've read it works the other way round, ie PK lenses will mount onto a SA body.


PostPosted: Sat Jan 31, 2015 9:19 am    Post subject: Reply with quote
Lightshow wrote:
Glad to help.
We really should put together a definitive lens mount ID thread.

That would be useful. Of the guides I could find online they all lacked at least two or three mounts that I was aware of. Perhaps include a reference of which systems each mount can be used with an adapter for as well. And notes on the fine details of telling very similar mounts apart - like a bird book with a "could be confused with" section.


PostPosted: Sat Jan 31, 2015 10:18 am    Post subject: Reply with quote
B & H or one of the American camera stores has a good guide to mounts on their website. I'v probably got it bookmarked ......somewhere..


it's KEH - and here's a link. There's three pages, the link to the next page is a bit small and obscure at the bottom of the pages.

http://blog.keh.com/tags/lens-mounts/



..

Last edited by Lloydy on Sun Feb 05, 2017 4:00 pm; edited 1 time in total


PostPosted: Sat Jan 31, 2015 7:27 pm    Post subject: Reply with quote
I found the KEH version, and also this one http://rick_oleson.tripod.com/index-99.html

But they're both incomplete and lacking the sort of detail needed to, for example, differentiate between Pentax K and Sigma SA mounts (relative positions of lens lock recess and red dot). I'm sure we could do better.

Ideally you'd want a system able to show two or more mounts alongside each other with the differences highlighted.


PostPosted: Sat Jan 31, 2015 10:46 pm    Post subject: Reply with quote
I'm working on one but most of the images are pulled from the net and probably copyrighted. My plan is to make a PDF available for download. Watch the forum for an announcement. And if anyone has a good photo of an obscure mount, specially 6x6 cameras, let me know.


PostPosted: Sun Feb 01, 2015 3:15 am    Post subject: Reply with quote
Borrowed images are not ideal, A Creative Commons license would be better with credit to MFlenses.


PostPosted: Sun Feb 01, 2015 12:54 pm    Post subject: Reply with quote
I started to take pictures of mounts and used some black cardboard with holes slipped over the mount so the bayonet flange poked through, the pictures were a lot clearer. But then I lost the pictures in a computer crash.


PostPosted: Sun Feb 01, 2015 2:47 pm    Post subject: Reply with quote
philslizzy wrote:
I'm working on one but most of the images are pulled from the net and probably copyrighted. My plan is to make a PDF available for download. Watch the forum for an announcement. And if anyone has a good photo of an obscure mount, specially 6x6 cameras, let me know.

Photos are *always* copyright - if you plan on using them it's your responsibility to provide evidence that either they've fallen out of copyright (70 years after the death of the photographer) or were provided under an appropriate license for the intended use. Randomly pulling photos from the 'net and then forgetting where from is completely the wrong way to go about this sort of thing. To then use these images to provide a downloadable resource and associate that with this forum by providing a link to advertise it.. well, the only phrases I can think to describe this might be taken as more insulting than would be intended.

It's not as if you don't have access to a forum of members dedicated to obscure lenses that could be asked for example of images representative of as many different mounts as possible.

Create a shopping list for the mounts you want clear, illustrative photos of and let's see what we can achieve as a forum. I can help with QBM (i and iv), Sigma SA and a couple of others.


PostPosted: Mon Feb 09, 2015 4:58 pm    Post subject: Reply with quote
Adapter arrived today, hopefully the weather will stay good for a couple more days and I'll give it a test.

It looks dam queer hanging the X-E2 off the back of this monster. Sitting on the tripod foot the lens balances easily with the body on the back. I haven't tried the -Pro1 yet, I'm hoping the OVF has just enough clearance to act as a spotting scope down the lens axis. I'm going to need to keep the heavy Velbon tripod just for this lens, I had planned on selling it off.


PostPosted: Mon Feb 09, 2015 11:32 pm    Post subject: Reply with quote
GeorgeSalt wrote:
philslizzy wrote:
I'm working on one but most of the images are pulled from the net and probably copyrighted. My plan is to make a PDF available for download. Watch the forum for an announcement. And if anyone has a good photo of an obscure mount, specially 6x6 cameras, let me know.

Photos are *always* copyright - if you plan on using them it's your responsibility to provide evidence that either they've fallen out of copyright (70 years after the death of the photographer) or were provided under an appropriate license for the intended use. Randomly pulling photos from the 'net and then forgetting where from is completely the wrong way to go about this sort of thing. To then use these images to provide a downloadable resource and associate that with this forum by providing a link to advertise it.. well, the only phrases I can think to describe this might be taken as more insulting than would be intended.

It's not as if you don't have access to a forum of members dedicated to obscure lenses that could be asked for example of images representative of as many different mounts as possible.

Create a shopping list for the mounts you want clear, illustrative photos of and let's see what we can achieve as a forum. I can help with QBM (i and iv), Sigma SA and a couple of others.


Yes, I know all this, and that's why I've never posted my project on line. Get off your high horse. Have I done it?

For my own personal use pics taken from the internet are perfectly legal - I'm not infringing anyone's copyright by looking at them - thats why there are there to start with - to be looked at..

There was a thread started ages ago but it died out...


PostPosted: Mon Feb 09, 2015 11:39 pm    Post subject: Reply with quote
philslizzy wrote:
Yes, I know all this, and that's why I've never posted my project on line. Get off your high horse. Have I done it?

For my own personal use pics taken from the internet are perfectly legal - I'm not infringing anyone's copyright by looking at them - thats why there are there to start with - to be looked at..

There was a thread started ages ago but it died out...


philslizzy wrote:
My plan is to make a PDF available for download. Watch the forum for an announcement.


Well excuse me for actually reading your post..

You clearly state an intent to share this document and use this forum as part of the distribution channel.. and this sort of casual appropriation bugs me.


PostPosted: Sun Feb 05, 2017 12:56 pm    Post subject: Reply with quote
Lloydy wrote:
B & H or one of the American camera stores has a good guide to mounts on their website. I'v probably got it bookmarked ......somewhere..


it's KEH - and here's a link. There's three pages, the link to the next page is a bit small and obscure at the bottom of the pages.

http://www.kehblog.com/2011/12/lens-mount-guide-part-1.html



..


I just took pictures of my lens mounts, and wanted to compare mine with theirs, and found this:
"Kehblog.com

This domain may be for sale. Backorder this Domain

This Domain Name Has Expired"

Too bad, it was a decent source for ID.
At least it's not gone forever:
http://web.archive.org/web/20160419110231/http://www.kehblog.com/2011/12/lens-mount-guide-part-1.html
http://web.archive.org/web/20160430171201/http://www.kehblog.com/2011/12/lens-mount-guide-part-2.html
http://web.archive.org/web/20160425060119/http://www.kehblog.com/2011/12/lens-mount-guide-part-3.html


PostPosted: Sun Feb 05, 2017 2:06 pm    Post subject: Reply with quote
It's http://blog.keh.com now


PostPosted: Sun Feb 05, 2017 4:02 pm    Post subject: Reply with quote
Gardener wrote:
It's http://blog.keh.com now


I've just updated the link in my original post. The KEH pages are a lot better now.


PostPosted: Mon Feb 06, 2017 1:52 pm    Post subject: Reply with quote
Lloydy wrote:
I started to take pictures of mounts and used some black cardboard with holes slipped over the mount so the bayonet flange poked through, the pictures were a lot clearer. But then I lost the pictures in a computer crash.

I like that idea (though for some white card would give better contrast)
I've also been trying to compile a mount ID system, I've been making copious measurements of the mounts I have available. Mounts like the OPs without the usual linkages get more awkward with just relative positions of features.
So far got measurements for 11 bayonet mounts most in both male & female versions. All fairly common types, I must add my Werra & Vectis mounts to have some oddballs on my list!


PostPosted: Mon Feb 06, 2017 2:50 pm    Post subject: Reply with quote
All this discussion about copyright got me to thinking. What about Wikipedia?

https://en.wikipedia.org/wiki/Pentax_K-mount

And here's a link from Wikipedia, a photo of the K-mount:

https://en.wikipedia.org/wiki/Pentax_K-mount#/media/File:Pentax_A_50mm_F1.7.jpg

The image (giant sized):



PostPosted: Mon Feb 06, 2017 6:37 pm    Post subject: Reply with quote
For an identification resource, I'd want better quality pictures.
I'd do it all myself, but I don't have every mount, and I'm not going to buy every mount, for example all my shots I rotated each lens so that focus distance mark is at 12:00, and slightly turned towards the softbox which is about 10cm away, it gives nice soft and even light, and should make all the details pop, and no blown out areas.


PostPosted: Mon Feb 06, 2017 6:40 pm    Post subject: Reply with quote
cooltouch wrote:
All this discussion about copyright got me to thinking. What about Wikipedia?

https://en.wikipedia.org/wiki/Pentax_K-mount

And here's a link from Wikipedia, a photo of the K-mount:

https://en.wikipedia.org/wiki/Pentax_K-mount#/media/File:Pentax_A_50mm_F1.7.jpg

<snip>

Using images with the creative commons attribution is acceptable IF you follow the terms of the license.
In your post although you linked to the original you didn't specifically attribute it to the photography who from the EXIF appears to be 'Adam.Jenkins' AKA Bilby.
Without that attribution you may still be in breach of copyright...

Such images would certainly be a simple way of filling out a comprehensive mount ID page, but I suspect there are enough photographers/collectors on this forum to arrange nearly all the images ourselves Smile


PostPosted: Wed Feb 15, 2017 1:24 am    Post subject: Reply with quote
Lloydy wrote:
Gardener wrote:
It's http://blog.keh.com now


I've just updated the link in my original post. The KEH pages are a lot better now.

The images are all broken...
http://blog.keh.com/2011/12/02/the-lens-mount-guide-part-1/

This one too: http://blog.keh.com/2012/03/12/leica-r-lenses-understanding-cams/


PostPosted: Fri Feb 17, 2017 1:27 am    Post subject: Reply with quote
DConvert wrote:
cooltouch wrote:
All this discussion about copyright got me to thinking. What about Wikipedia?

https://en.wikipedia.org/wiki/Pentax_K-mount

And here's a link from Wikipedia, a photo of the K-mount:

https://en.wikipedia.org/wiki/Pentax_K-mount#/media/File:Pentax_A_50mm_F1.7.jpg

<snip>

Using images with the creative commons attribution is acceptable IF you follow the terms of the license.
In your post although you linked to the original you didn't specifically attribute it to the photography who from the EXIF appears to be 'Adam.Jenkins' AKA Bilby.
Without that attribution you may still be in breach of copyright...


Nonsense. My posting of the above information will certainly fall under the "fair use" principle.

Creative Commons specifically states:

The rights of users under exceptions and limitations, such as fair use and fair dealing, are not affected by the CC licenses.
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