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Freelensing with 35KP-1.8/140mm Russian projector lens
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PostPosted: Mon Nov 24, 2014 10:33 am    Post subject: Reply with quote
лин/мм means lines/mm, not lp/mm, so actual resolution is 2x less.


PostPosted: Mon Nov 24, 2014 11:00 am    Post subject: Reply with quote
CuriousOne wrote:
лин/мм means lines/mm, not lp/mm, so actual resolution is 2x less.


Yes, that is what Klaus said too.
Nevertheless it has plenty of potential from the little that I have used it.
I have figured out a tripod mount - so next the connections to the camera etc.
Cheers
OH




PostPosted: Mon Nov 24, 2014 9:05 pm    Post subject: Reply with quote
Still free-lensing.
One more from a very bad bunch - too much extraneous light.
OH



PostPosted: Mon Nov 24, 2014 10:17 pm    Post subject: Reply with quote
Looks very promising that result!

The tripod clamp is neat, but it will collide with the focusing heliocid (if you go that route I proposed...)


PostPosted: Mon Nov 24, 2014 10:23 pm    Post subject: Reply with quote
kds315* wrote:
Looks very promising that result!

The tripod clamp is neat, but it will collide with the focusing heliocid (if you go that route I proposed...)


Thanks Klaus.
Hmmmmmm .......... I thought that with the tripod collar foot facing forward I would avoid that.
I will have some trial and error I am sure in getting this fully operational.
Interestingly, there is a colour change in this image that I can't explain.
The stamens were a charcoal grey as well as the shadowed background.
It came out as you see - a kind of maroon ........
The yellows are exact however.
OH


PostPosted: Mon Nov 24, 2014 10:39 pm    Post subject: Reply with quote
Oldhand wrote:
kds315* wrote:
Looks very promising that result!

The tripod clamp is neat, but it will collide with the focusing heliocid (if you go that route I proposed...)


Thanks Klaus.
Hmmmmmm .......... I thought that with the tripod collar foot facing forward I would avoid that.
I will have some trial and error I am sure in getting this fully operational.
Interestingly, there is a colour change in this image that I can't explain.
The stamens were a charcoal grey as well as the shadowed background.
It came out as you see - a kind of maroon ........
The yellows are exact however.
OH


That color change might be due to CA I would guess as the focus plane is razor think especially so close (which is waaayyy out of the lens definition it was computed for, so no wonder...)

Your lens has some 50-60mm back focal distance, so deduct the camera register from that, the optical adapter length and you'll see soon that the lens has to dive in quite deeply into the focusing helicoid. So it may or may not work...


PostPosted: Mon Nov 24, 2014 10:46 pm    Post subject: Reply with quote
kds315* wrote:
Oldhand wrote:
kds315* wrote:
Looks very promising that result!

The tripod clamp is neat, but it will collide with the focusing heliocid (if you go that route I proposed...)


Thanks Klaus.
Hmmmmmm .......... I thought that with the tripod collar foot facing forward I would avoid that.
I will have some trial and error I am sure in getting this fully operational.
Interestingly, there is a colour change in this image that I can't explain.
The stamens were a charcoal grey as well as the shadowed background.
It came out as you see - a kind of maroon ........
The yellows are exact however.
OH


That color change might be due to CA I would guess as the focus plane is razor think especially so close (which is waaayyy out of the lens definition it was computed for, so no wonder...)

Your lens has some 50-60mm back focal distance, so deduct the camera register from that, the optical adapter length and you'll see soon that the lens has to dive in quite deeply into the focusing helicoid. So it may or may not work...


Thank you again.
Fun times ahead .............. Very Happy
OH


PostPosted: Mon Nov 24, 2014 10:55 pm    Post subject: Reply with quote
Yep, but well worth it, considering the great results that lay ahead of you Wink


PostPosted: Mon Nov 24, 2014 11:33 pm    Post subject: Reply with quote
One more at full aperture and up close and personal.
OH



PostPosted: Wed Mar 18, 2015 1:49 am    Post subject: Reply with quote
Nice images, congrats!

Did you have any success in making an aperture for this lens?

I am going to get a bell & howell 16mm 1.2/50 lens. Did not find any description of its optical formula. I thought a cardboard circle on the front lens could be enough. But that does not work like that, right? That only darkens the light but does not sharpens the image?

I tried to find some descriptions of successful experiments with mounting an aperture to projection lenses, here and in the free net. Surprisingly, I found nothing. Or I just used wrong keywords?

Will be glad to have your comments and good examples.


PostPosted: Wed Mar 18, 2015 3:13 am    Post subject: Reply with quote
alex ph wrote:
Nice images, congrats!

Did you have any success in making an aperture for this lens?

I am going to get a bell & howell 16mm 1.2/50 lens. Did not find any description of its optical formula. I thought a cardboard circle on the front lens could be enough. But that does not work like that, right? That only darkens the light but does not sharpens the image?

I tried to find some descriptions of successful experiments with mounting an aperture to projection lenses, here and in the free net. Surprisingly, I found nothing. Or I just used wrong keywords?

Will be glad to have your comments and good examples.


No, I have only used the home-made cardboard aperture disks so far.
It is still a project for the future.
OH


PostPosted: Sat Jun 13, 2015 1:57 am    Post subject: Reply with quote
http://forum.mflenses.com/ko-140m-140mm-f1-8-projector-portraits-sony-nex-7-t71552.html


PostPosted: Sat Jun 13, 2015 9:12 pm    Post subject: Reply with quote
I did play more today with this lens, on highlighted areas CA is very significant, but.. lens is brutal sharp and bring nice details as well, so CA is little price and in same light even my Zeiss lenses produce CA well , so a rare opportunity to get powerful fast lens on low cost . Lot better option than any other under 500 USD


PostPosted: Sat Jun 13, 2015 11:59 pm    Post subject: Reply with quote
I am not getting the same excellent results as you are Attila, and at wide open it does have the CA issues.
Mine seems to need some aperture control to bring out its best.
Here are a few from this morning at f1.8.
OH






PostPosted: Fri Sep 01, 2017 1:19 pm    Post subject: Reply with quote
Just cut rear 12mm on it. Russians know how to build tanks, it is like fitness to use it without tripod. I also have KO140M, which is about 50% lighter. Cheerz!



PostPosted: Sun Oct 11, 2020 8:10 am    Post subject: Reply with quote
Hello all, I know I haven't presented me already but just to say I have used this lens, the 140mm lighter one, on a pentax 645 and covers the whole frame without vignetting, I just had to saw the rear aluminium side till the beginning of the thread screw


PostPosted: Tue Oct 13, 2020 12:17 pm    Post subject: Reply with quote
kds315* wrote:

6 reflections only? That would make a 3 element lens ... must be many more (I count a total of 12 on
mine; some are barely visible, I use a LED lamp and shine inside)


How can you possibly have twelve reflections in a lens with only four air/glass surfaces plus two glass/glass surfaces? Are you sure you did not count a second set of reflexes ("reflexes of reflexes")? This would explain that some reflexes are "barely visible"!

S


PostPosted: Tue Oct 13, 2020 7:11 pm    Post subject: Reply with quote
stevemark wrote:
kds315* wrote:

6 reflections only? That would make a 3 element lens ... must be many more (I count a total of 12 on
mine; some are barely visible, I use a LED lamp and shine inside)


How can you possibly have twelve reflections in a lens with only four air/glass surfaces plus two glass/glass surfaces? Are you sure you did not count a second set of reflexes ("reflexes of reflexes")? This would explain that some reflexes are "barely visible"!

S


Quite easy, as you seem to assume it is a Petzval lens? But this one has a Planar scheme... Wink
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