Graflex.org

peter k · Joined: 26 Dec 2009 Posts: 207 Location: Sedona Az

At
http://graflex.org/speed-graphic/which-model.html
it states that:

Dan Fromm · Joined: 14 May 2001 Posts: 2134 Location: New Jersey

Peter, the quotation is wrong. For 3x4 Speed Graphics, minimum flange-to-film distances are:

Anniversary: 63.5 mm
Pacemaker: 66.7 mm

Its wrong for 4x5s too, the 4x5 Pacemaker Speed's minimum is also 66.7 mm. And its horribly wrong for 2x3s. The shortest lens I use on my 2x3 Pacemaker Speed is a 1.75"/2.8 Elcan in barrel; it covers only 6x6, though, doesn't come close to covering 2x3.

If you check data from lens makers' sites or the slightly out-of-date list of lenses on this site you'll see that there are many lenses with focal lengths as short as 60 mm +/- that will focus to infinity on your 3x4 Speed. Pay attention to coverage, I believe you need a lens that covers at least 127 mm to get good image quality in the corners.

Good luck, have fun, don't believe everything you read,

Dan

peter k · Joined: 26 Dec 2009 Posts: 207 Location: Sedona Az

thanks allot for the clarity... reading different posts, it seems most 3x4 speeds had a 127mm, although press people liked them for the 4x5 because of the wider image, even if they didn't get the corners.

I have an Anniversary, been loving it, even though a 3x4..

Henry · Posted: Tue May 29, 2012 7:24 pm Post subject:

The 10th ed. (1954) of "Graphic Graflex Photography," p. 24, says the 65 and 80 Wide Angle Optars and Wide Field Ektars will work on 3x4. Don't know about coverage w/movements, though.

peter k · Joined: 26 Dec 2009 Posts: 207 Location: Sedona Az

Thanks for the help, ..

The lens I'm looking at is not an Optar... and reading the info again, it states that it has a built-in focusing mount and depth-of-field scale, and can be used with any bellows camera set at infinity.
So no movement using it on the speed.

Yet with a roll film adapter that shoots 6x6, I really don't have to worry about the corners.

45PSS · Posted: Tue May 29, 2012 7:40 pm Post subject:

You are confusing focal length with image circle. True, a 127mm focal length is considered "normal" for the 3x4 camera but a lens needs to produce an image circle of [ the square root of 3 1/4² + 4 1/4²; 10.5625 + 18.0625=28.625 taking the square root = 5.3502336397581741495630759274711, convert to millimeters =]135.89593444985762339890212855777mm to cover the negative.
Now the actual image size is less than the negative size and the film holder specifications state that the image area is 4.228 x 3.131 so 4.228² =17.875984, 3.131² =9.803161; adding them =27.679145 and taking the square root = 5.2610973190010465724479405799684, convert to millimeters = 133.6318719026265829401776907312 to cover the image area of a 3 1/4 x 4 1/4 film holder.

Image circle needed for a roll film holder
A= the short side of the format you wish to cover
B= the long side of the format you wish to cover
C= the diagonal of the format
A²+B²=C²
1 inch = 25.4 millimeters.
_________________
The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.

Henry · Posted: Tue May 29, 2012 7:42 pm Post subject:

I just love these approximations

45PSS · Posted: Tue May 29, 2012 7:50 pm Post subject:

With windows calculator in Scientific mode the copy-paste makes rounding extra key strokes.

_________________
The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.

Henry · Posted: Tue May 29, 2012 7:58 pm Post subject:

I feel cheated. I can only enter nine digits into my Mac 10.6 Dashboard calculator.

1banjo · Joined: 16 Nov 2008 Posts: 492 Location: kansas

hey peter k

just so you know that Schneider 80mm f2.9 was sold on a lot of 23 cameras BUT It DON'T COVER a 6x9 by Schneider lens data @

http://www.schneideroptics.com/info/vintage_lens_data/large_format_lenses/xenotar/data/2,8-80mm.html

it shows a IC of 91mm a 23 needs of about 99mm & your 3x4
will need 127 or so

NOT 80mm or 90mm are wide angle!! they needs to say
wide angle or wide field!!!!!

peter k · Joined: 26 Dec 2009 Posts: 207 Location: Sedona Az

haha.. oh boy...
I'm in lens trouble again

45PSS · Posted: Wed May 30, 2012 2:43 am Post subject:

My Graphic 22 RFH has a 57mm x 57mm film opening. It requires a 81mm image circle to cover it.

My Graphic 23 RFH has a 57mm x 78mm film opening. It requires a 96.6mm image circle to cover it.
_________________
The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.

Dan Fromm · Joined: 14 May 2001 Posts: 2134 Location: New Jersey

45PSS · Posted: Wed May 30, 2012 7:04 pm Post subject:

error corrected.
_________________
The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.