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 

90mm Graflex optar lens

 
Post new topic   Reply to topic    Graflex.org Forum Index -> Lenses Help
View previous topic :: View next topic  
Author Message
kevin52



Joined: 07 Sep 2012
Posts: 1
Location: Stockton CA

PostPosted: Tue Jul 30, 2013 10:54 pm    Post subject: 90mm Graflex optar lens Reply with quote

I have a Graflex Optar 90mm lens serial number 287310. The shutter works but there are no aperture settings. Also there are 2 screws on the side of the wider part of the lens. The question is this: Is this lens a camera lens or an enlarger lens? I hope someone can help me. Thank you.
_________________
Kevin T Chupp
Back to top
View user's profile Send private message
Henry



Joined: 09 May 2001
Posts: 1442
Location: Allentown, Pennsylvania

PostPosted: Tue Jul 30, 2013 11:16 pm    Post subject: Reply with quote

Can you post a photo? The enlarger lenses I'm familiar with for 35mm work have aperture settings but no shutter, as the exposure timing is usually controlled through an external device that the enlarger is plugged into in the darkroom (mine is a Time-o-Light), and runs on the order of one second through a minute. I've never seen a lens-shutter combo with no apertures!
Back to top
View user's profile Send private message
45PSS



Joined: 28 Sep 2001
Posts: 3228
Location: Mid Peninsula, Ca.

PostPosted: Wed Jul 31, 2013 7:39 pm    Post subject: Reply with quote

What shutter is the lens in? Compur shutters use an aperture scale attached with two screws along the bottom of the shutter face plate with the speed marking and index point on the top.
f stops are a function of the lens focal length divided by the aperture opening diameter as viewed through the lens from the front.
f stop=focal length/viewed aperture opening
viewed aperture opening=lens focal length/desired f stop number
A 90mm Optar/Raptar taking lens is f6.8
90/6.8=13.235mm aperture opening as viewed through the front of the lens. Smallest aperture will be f32 or f45 for this lens.
One can easily make a scale for the lens/shutter.
_________________
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