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

 
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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
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Henry



Joined: 09 May 2001
Posts: 1443
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!
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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
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Henry



Joined: 09 May 2001
Posts: 1443
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.
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Dan Fromm



Joined: 14 May 2001
Posts: 1889
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.
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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?
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45PSS



Joined: 28 Sep 2001
Posts: 3233
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.
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1banjo



Joined: 16 Nov 2008
Posts: 478
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
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1banjo



Joined: 16 Nov 2008
Posts: 478
Location: kansas

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

BOBOED

"Image Circle Giameter "Image Circle Diameter !!
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Dan Fromm



Joined: 14 May 2001
Posts: 1889
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
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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]
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