MFlenses - A new life in a digital age
MFLenses 2026

Manual Focus Lenses Forum

Explore the world of vintage lenses through repair notes, real test shots, and detailed archive threads packed with images.

Explore the world of vintage lenses through repair notes, real test shots, and detailed archive threads packed with images.
logovectorizer.com
Spotlight

Featured partner placement for the forum front page.

Russian projector lens RO-109-1A 5cm f/1.2 DIY - on G1
Post new topic Reply to topic
View previous topic :: View next topic  


Post
Posted: Sun Feb 24, 2013 11:22 am
Post subject: Russian projector lens RO-109-1A 5cm f/1.2 DIY - on G1
Reply
Post
Posted: Sun Feb 24, 2013 11:22 am
Post subject: Russian projector lens RO-109-1A 5cm f/1.2 DIY - on G1
Reply
The flange distance of this PL is very short! I cut away 7mm of the rear metal part of the lens in order to achieve infinity focus. Focusing is easy, thanks to the China made M52/M42 helicoid! Very Happy Very Happy

Specifications of the lens I found on the Internet are listed below. Amazing 90/45 centre to edge resolving power!

Focal length, mm - 49.93
Relative aperture - 1:1.2
Field of view, g - 14
Front focal length, mm - 16.11
Back focal length, mm - 26.11
Transmittance - 0,82
The resolving power, lines / mm
in the center - 90
on the edge of the field - 45
Number of lenses - 6
Light diameter of the first surface, mm - 43.4
Light diameter of the last surface, mm - 29.5

Maximum diameter of the rim, mm - 52.5
Frame Length, mm - 81
Seat diameter, mm - 38
Landing sizes for attachments
smooth, mm - 52.5
threaded - JMP 50h0, 75
Weight, g - 180














































Post
Posted: Sun Feb 24, 2013 3:22 pm
Post subject:
Reply
Post
Posted: Sun Feb 24, 2013 3:22 pm
Post subject:
Reply
Wow that raven looks so natural


Post
Posted: Sun Feb 24, 2013 3:44 pm
Post subject:
Reply
Post
Posted: Sun Feb 24, 2013 3:44 pm
Post subject:
Reply
Arctures wrote:
Wow that raven looks so natural


Thank you! Very Happy


Post
Posted: Sun Feb 24, 2013 4:03 pm
Post subject:
Reply
Post
Posted: Sun Feb 24, 2013 4:03 pm
Post subject:
Reply
I like the raven too!
Projector lens, so all these pictures are made WO, as you don't have an adjustable aperture?


Post
Posted: Sun Feb 24, 2013 4:13 pm
Post subject:
Reply
Post
Posted: Sun Feb 24, 2013 4:13 pm
Post subject:
Reply
Minolfan wrote:
I like the raven too!
Projector lens, so all these pictures are made WO, as you don't have an adjustable aperture?


Not exactly wide-open. I put a black rubber ring of suitable size in front of the front lens to restrict the incoming light (don't want to open up the lens to put it in between the lens elements). WO is a bit soft. After I have done that, the lens f-stop should be around f/1.4 or f/1.5. All my pictures above were with the rubber ring on. Smile


Post
Posted: Sun Feb 24, 2013 9:46 pm
Post subject:
Reply
Post
Posted: Sun Feb 24, 2013 9:46 pm
Post subject:
Reply
Wonderful pictures and very nice IQ. I'm very tempted to pick one up. But I can tell that there's a good photographer behind these samples also..


Post
Posted: Sun Feb 24, 2013 9:47 pm
Post subject:
Reply
Post
Posted: Sun Feb 24, 2013 9:47 pm
Post subject:
Reply
Wonderful pictures and very nice IQ. I'm very tempted to pick one up. But I can tell that there's a good photographer behind these samples also..


Post
Posted: Sun Feb 24, 2013 10:15 pm
Post subject:
Reply
Post
Posted: Sun Feb 24, 2013 10:15 pm
Post subject:
Reply
Pontus wrote:
Wonderful pictures and very nice IQ. I'm very tempted to pick one up. But I can tell that there's a good photographer behind these samples also..


Yes, pick one up quickly before the price goes up! Everything is getting more and more pricey these days! Sad
I am not a good photographer at all, but used to be a radiographer though. That was 28 years ago!


Post
Posted: Sun Feb 24, 2013 10:59 pm
Post subject:
Reply
Post
Posted: Sun Feb 24, 2013 10:59 pm
Post subject:
Reply
Radio or Photo is maybe in some way connected Wink
I am a radio engineer, but I love taking pictures!

The most important is the result - you have produced some very good pictures with... a rubber aperture ring!!! Congratulations!

Good luck!


Post
Posted: Sun Feb 24, 2013 11:52 pm
Post subject:
Reply
Post
Posted: Sun Feb 24, 2013 11:52 pm
Post subject:
Reply
wrote:
Not exactly wide-open. I put a black rubber ring of suitable size in front of the front lens to restrict the incoming light (don't want to open up the lens to put it in between the lens elements). WO is a bit soft. After I have done that, the lens f-stop should be around f/1.4 or f/1.5. All my pictures above were with the rubber ring on.

Works good! So you can take a rubber ring with a different hole to change the effect.


Post
Posted: Mon Feb 25, 2013 5:18 am
Post subject:
Reply
Post
Posted: Mon Feb 25, 2013 5:18 am
Post subject:
Reply
Nickita wrote:
Radio or Photo is maybe in some way connected Wink
I am a radio engineer, but I love taking pictures!

The most important is the result - you have produced some very good pictures with... a rubber aperture ring!!! Congratulations!

Good luck!


Yes! Radio or ohoto is somehow connected! Smile
Thanks a lot for your appreciation! Cheers,
Ferrick


Post
Posted: Mon Feb 25, 2013 5:20 am
Post subject:
Reply
Post
Posted: Mon Feb 25, 2013 5:20 am
Post subject:
Reply
Minolfan wrote:
wrote:
Not exactly wide-open. I put a black rubber ring of suitable size in front of the front lens to restrict the incoming light (don't want to open up the lens to put it in between the lens elements). WO is a bit soft. After I have done that, the lens f-stop should be around f/1.4 or f/1.5. All my pictures above were with the rubber ring on.

Works good! So you can take a rubber ring with a different hole to change the effect.


Good idea! I will try that the coming weekend (it is Monday and have to work for another entire week Sad ).
Thanks!
Post new topic Reply to topic
Page 1 of 1