www.photomacrography.net :: View topic - tube lens comparison
www.photomacrography.net Forum Index
An online community dedicated to the practices of photomacrography, close-up and macro photography, and photomicrography.
Photomacrography Front Page Amateurmicrography Front Page
Old Forums/Galleries
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
tube lens comparison
Goto page Previous  1, 2
 
Post new topic   Reply to topic    www.photomacrography.net Forum Index -> Equipment Discussions
View previous topic :: View next topic  
Author Message
enricosavazzi



Joined: 21 Nov 2009
Posts: 1095
Location: Stockholm, Sweden

PostPosted: Thu Dec 06, 2018 11:27 am    Post subject: Reply with quote

Pau wrote:
If you were able to exchange the second position prism (or mirror) for a beamsplitter you would have a simpler typical trino configuration

Unfortunately, the prism is a single piece, and a beam splitter cube does not work here (the bino viewer is tilted upwards).
_________________
--ES
Back to top
View user's profile Send private message Visit poster's website
pbraub



Joined: 02 Feb 2018
Posts: 10

PostPosted: Thu Dec 06, 2018 12:22 pm    Post subject: Reply with quote

Thank you for your descriptions and sharing the photos!
I did not expect it to be so complex, but in the end I did not know what to expect. I think this will make an interesting project for you.

Peter
Back to top
View user's profile Send private message
Greenfields



Joined: 25 Nov 2010
Posts: 95
Location: Nottinghamshire, England

PostPosted: Fri Dec 07, 2018 12:40 pm    Post subject: Reply with quote

Olympus Tube Lenses

1] There is a 4-page brochure for the Olympus SWTLU-C Tube lens for system builders, which, as its designation implies, is intended to be used up to a field number of 26.5mm.

http://photos.labwrench.com/equipmentManuals/31702-9877.pdf

Just as with the contemporary Nikon CFI60 objectives, some Olympus Plan Fluor objectives can produce larger usable images than this field number implies, and with a more common 200mm tube lens the extra magnification will cover a 35mm full frame sensor.

2] Enrico Savazzi is correct to suggest that the super-widefield head uses a different tube lens. The Olympus service manual for their standard head shows a three element tube lens and a four element tube lens for their super-widefield head.

3] In the earlierst Olympus patent I know of which describes a tube lens design for their UIS system, US Patent 5 394 271 to Takaaki Tanake, Toshinobu Suzuki and Chikara Nagano filed 22 Oct 1992, both three and four element designs are disclosed. I suspect that it is almost certain that this design has been refined more than once because of the environmentally-driven contraction in the range of commercially produced optical glasses in the intervening 26 years.

4] Olympus have routinely used a 4-element tube lens to illustrate their patents for many subsequent infinity objectives. but when Kurvits and others, https://arxiv.org/pdf/1507.04037.pdf dismantled a U-TLU they found that it did not match the design used in the patents. Whether this means that it has a three-element design or a differeent four element design they did not say.

Henry
_________________
Feel free to edit my images.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    www.photomacrography.net Forum Index -> Equipment Discussions All times are GMT - 7 Hours
Goto page Previous  1, 2
Page 2 of 2

 
Jump to:  
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


Powered by phpBB © 2001, 2005 phpBB Group