
Posted: Thu Jan 26, 2017 1:15 pm
The lens is a rebadged 270 Rodenstock Rotelar. I have one. It can't be mounted on a 2x3 Graphic in the usual way. Its rear cell is too large to pass through the front standard's throat. And it is too large to be wrestled through the back of the camera.
You say you have a "mini-speed." Do you have a Miniature Speed Graphic, a 2x3 Pacemaker Graphic (Crown, Speed) or a Century?
LF lenses in shutter are put on lens boards to mount on cameras. The rear cell and shutter's retaining ring are removed, the back of the shutter then goes through a hole (has to be the right size) in the lens board, the retaining ring goes back to clamp the shutter to the board and then the rear cell goes back in. And then the lens in shutter is ready to be put on a camera.
The longest lens specifically offered for 2x3 Graphics was the 10"/5.6 TeleOptar/TeleRaptar. I've had one. Its rear cell will pass through a 2x3 Graphic's front standard.
The longest lens that's a comfortable fit on a 2x3 Speed Graphic is an aerial camera lens, the 12"/4 Taylor Taylor Hobson Telephoto as was made for Vinten F.95 and Williamson/AGI F.134 and F.139 cameras. I have one. It is a big fat lens, I had SKGrimes make a ring that goes through a board and screws into the back of the lens' barrel. One is on offer on eBay now, see
http://www.ebay.com/itm/Rare-taylor-hobson-12-inch-f4-military-aerial-lens-Large-format-4x5-nikon-cooke-/182433245363
2x3 Graphics are useful little cameras but they have their limits.