Has anyone modified their CB-7 Beseler enlarger for 5x7 ?

[Bob Salomon]

Good to know - cheers! Was slightly worried that the CB7 might have had some unique components in that regard.

Just bear in mind, the lens board of a 45 Beseler will not accept better enlarging lenses as they have a 50mm thread size!

[Tin Can]

Custom lens boards will.

I didn't make this, but somebody did. 240 EL Nikkor fits any Beseler 4X5, I use it as intended on a V-XL. Beautiful lens.

IMG-1221 by TIN CAN COLLEGE, on Flickr

IMG-1222 by TIN CAN COLLEGE, on Flickr

Just bear in mind, the lens board of a 45 Beseler will not accept better enlarging lenses as they have a 50mm thread size!

[interneg]

Just bear in mind, the lens board of a 45 Beseler will not accept better enlarging lenses as they have a 50mm thread size!

Am all too aware of this! First priority is having a good look inside the lens stage & seeing what the possibilities are. Hopefully not involving the manufacture of an entire new lens stage... Mainly interested in seeing if a bench top 8x10 enlarger using optimal optics for up to a 16x20 is a feasible reality.

[interneg]

Custom lens boards will.

I didn't make this, but somebody did. 240 EL Nikkor fits any Beseler 4X5, I use it as intended on a V-XL. Beautiful lens.

And if I'm not mistaken, that EL-Nikkor is even more of a beast of an optic than the 240 or 300mm Rodagons.

[Tin Can]

And if I'm not mistaken, that EL-Nikkor is even more of a beast of an optic than the 240 or 300mm Rodagons.

[interneg]

I recall that it's only the 360mm Rodagon that demands the same size of thread as that Nikkor - why all the EL-Nikkors over 150mm used such vast thread mounts vis-a-vis Rodenstock is something I suspect we'll never know an answer to!

[Tin Can]

I recall that it's only the 360mm Rodagon that demands the same size of thread as that Nikkor - why all the EL-Nikkors over 150mm used such vast thread mounts vis-a-vis Rodenstock is something I suspect we'll never know an answer to!

Good to know as I have a 360 Rodagon, and I have yet to figure out why...

[Eric Woodbury]

I have a 210mm El Nikkor mounted. I had to trim the retaining ring, but it fits on a standard lens board.