Graflex.org Forum Index Graflex.org
Get help with your Graflex questions here
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Lens Questions on Speed Graphic

 
Post new topic   Reply to topic    Graflex.org Forum Index -> Lenses Help
View previous topic :: View next topic  
Author Message
crainier



Joined: 20 Jun 2010
Posts: 4
Location: New York

PostPosted: Sun Jun 20, 2010 10:20 am    Post subject: Lens Questions on Speed Graphic Reply with quote

I am considering buying a 165mm f2.7 Zeiss Tessar lens. Does anybody know if it will fit onto a standard Speed Graphic lens board or does it need a specialized mount? Also with this lens can I get the same shallow focus effect and color as a Kodak Aero-Ektar 178MM F2.5 lens..

Thank-you!


C.
Back to top
View user's profile Send private message
Les



Joined: 09 May 2001
Posts: 2682
Location: Detroit, MI

PostPosted: Sun Jun 20, 2010 10:36 am    Post subject: Reply with quote

I've never seen an f2.7 Tessar, but I have a 152mm F2.7 B&L Baltar lens in barrel that needed a special lens board, so I'd have to assume yours will too.

Since depth of field is dependent on subject distance, yes this 2.7 Tessar would give you the same depth of field as the aero Ektar would. That said, the characteristics of the out of focus image and the sharpness of the infocus image might differ quite a bit.

A relatively sharp but low contrast lens will appear to have a greater depth of field because the human will have a harder time discerning the point where the in focus image meets the out of focus area. Where as a brutally sharp, high contrast lens will appear to have less depth of field.
_________________
"In order to invent, you need a good imagination and a lot of junk" Thomas Edison
Back to top
View user's profile Send private message
45PSS



Joined: 28 Sep 2001
Posts: 4081
Location: Mid Peninsula, Ca.

PostPosted: Sun Jun 20, 2010 9:52 pm    Post subject: Reply with quote

from the Vademecum:

1926
Tessar f2.7 It was made in 15-165mm in 11 foci in 1926.
It was noted as 2in =5cm for 1x0.75in movie; 3in or better 3.125in = 8cm for VP; 4in or 4.75in for 6x9cm;
5.75in for 1/4plate; 6.0in or 6.5in for 5x4in, 7in =18cm for 5.5x3.25in and 8.25in = 21cm for 6.5x4.75in.
This Tessar was for cine+press use. They were later made in 0.375in (9mm) to 8.5in in 15 sizes in 1929). The
coverage in B.J.A. 1926, p658 seems the same for the Tessar f2.7 as for the Triotar f3.5 and f3.0 and they are
all tabled up together.

The central image was good enough to allow it to continue as a cine lens
into the 1930's, but the design seemingly was revised for the Movikon 16mm as it seems there is a Patent for
a reversed Tessar f2.7 for 45°at that period.(USPat 1,826,362).
_________________
The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    Graflex.org Forum Index -> Lenses Help All times are GMT
Page 1 of 1

 
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