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 

Question ... 8" Tele-Optar f5.6

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



Joined: 16 Feb 2012
Posts: 5
Location: Minneapolis

PostPosted: Fri Feb 17, 2012 7:50 pm    Post subject: Question ... 8" Tele-Optar f5.6 Reply with quote

given that this lens is meant for 2 x 3 format is there any particular reason that this couldn't also be used on a Crown Graphic?

Considering the comparable 4 x 5 lens is 203 mm why wouldn't or couldn't this also work?

thanks
Back to top
View user's profile Send private message
Henry



Joined: 09 May 2001
Posts: 1636
Location: Allentown, Pennsylvania

PostPosted: Fri Feb 17, 2012 8:29 pm    Post subject: Reply with quote

According to "Graphic Graflex Photography," 1954 edition (p. 15), the 8" Tele-Optar (202 mm, 2x) is indeed listed for the 2x3 Graphic, as, for that matter, is the 10" Tele-Optar (25 cm, 2.5x). So you should be good to go. Incidentally, the 203 Optar (not a tele) works on my Century; it may be the best lens I own!
Back to top
View user's profile Send private message
KevB



Joined: 16 Feb 2012
Posts: 5
Location: Minneapolis

PostPosted: Fri Feb 17, 2012 8:48 pm    Post subject: Reply with quote

my bad ... sorry

I should have been specific in my first post and question I have a 4x5 Crown and what I was asking is if the 8" can be made to work on that camera ... again apologies for the confusion
Back to top
View user's profile Send private message
Henry



Joined: 09 May 2001
Posts: 1636
Location: Allentown, Pennsylvania

PostPosted: Fri Feb 17, 2012 8:51 pm    Post subject: Reply with quote

The 8" Tele is NOT listed for 4x5 (above source); the 10" Tele is, however. Don't ask me why; I'm sure that Dan Fromm and others could explain the why/nots.
Back to top
View user's profile Send private message
Dan Fromm



Joined: 14 May 2001
Posts: 2118
Location: New Jersey

PostPosted: Fri Feb 17, 2012 9:23 pm    Post subject: Reply with quote

The lens can be used on a 4x5 Graphic, i.e., it can be focused to infinity on one. It isn't recommended for use on 4x5 because it won't cover the format.

Telephoto lenses have one large advantage -- back focus usefully shorter than focal length -- that lets them be used comfortably on relatively short cameras. They have one large disadvantage, less coverage than lenses of normal construction.
Back to top
View user's profile Send private message
KevB



Joined: 16 Feb 2012
Posts: 5
Location: Minneapolis

PostPosted: Fri Feb 17, 2012 9:40 pm    Post subject: Reply with quote

thanks

anyway to figure out what the loss of coverage would be?
Back to top
View user's profile Send private message
45PSS



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

PostPosted: Fri Feb 17, 2012 9:54 pm    Post subject: Reply with quote

Using the same center point draw a 24mm x 36mm rectangle with a circle that just touches the 4 corners then draw a 6 cm x 4.5cm rectangle with circle, 6cm x 6cm, 6cm x 7cm, 6cm x 9cm, 2 1/4 x 3 1/4 (inch), 3 1/4 x 4 1/4, 4 x 5, 5 x 7, 8 x 10, and 11 x 14.

A lens that is listed for a given format will have an image circle equal to or greater than the circle that encompasses the format it is made for but that image circle will be smaller than the next larger format circle.
Using a smaller format lens on a larger format will result in soft focus in the corners to vignetting to a circular image.

Using a larger format lens on a smaller format will give a lot of movement room.
_________________
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
1banjo



Joined: 16 Nov 2008
Posts: 492
Location: kansas

PostPosted: Fri Feb 17, 2012 10:41 pm    Post subject: Reply with quote

I don't know why they call it a 202mm when 8" = 203.3mm

anyway on page 50 in my 1952 edition
thay say that the 202mm is for upto 3 1/4 x 4 1/4 film size
& the 250mm for 4x5
I don't see anywhere what the Image Circle Giameter is on them
Back to top
View user's profile Send private message
1banjo



Joined: 16 Nov 2008
Posts: 492
Location: kansas

PostPosted: Fri Feb 17, 2012 10:43 pm    Post subject: Reply with quote

BOBOED

"Image Circle Giameter "Image Circle Diameter !!
Back to top
View user's profile Send private message
Dan Fromm



Joined: 14 May 2001
Posts: 2118
Location: New Jersey

PostPosted: Sat Feb 18, 2012 12:29 am    Post subject: Reply with quote

Wollensak ain't sayin'. See http://www.cameraeccentric.com/html/info/wollensak_5.html
Back to top
View user's profile Send private message
KevB



Joined: 16 Feb 2012
Posts: 5
Location: Minneapolis

PostPosted: Sun Feb 19, 2012 3:14 pm    Post subject: Reply with quote

Thanks all ... Happy to say I found what I had been looking for all along that being a 203 mm ektar

Appreciate your comments and yet another chapter in my Crown Graphic lessons[/url]
Back to top
View user's profile Send private message
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