putting rodagon 240mm to Beseler 810VXL......anyone know in NYC area who can do lens board drilling?

[jeff_liao1]

hi

i am replacing my 240mmAPO-gerogon to Rodagon 240mm...(Bob salman...i

trust you)

from my understanding Beseler does not make lens board for this lens.

(72mm) right?

So what i can do is to buy a blank board then drilled a 72mm hole.

will a flat or recessed board make any different?

Recedssed board may let me get larger print size?

 

anyone know in NYC area who can do lens board drilling?

 

thanks

 

Jeff

[richard_ilomaki]

Jeff:

 

You can!

 

Yesterday I made a lensboard for a 180 mm process lens for a Graflex Super. I got a black plastic folding DVD case ( 25 cents), cut out 2 pieces of sheet to fit the mount on the camera, using an Exacto knife, then placed the lens on the boards separately and traced out the circle with a marker, then carefully cut the circles with the Exacto knife.

 

Then I glued the two pieces together as a reasonable stiff sandwich panel and in 1/2 hr had a custom lens board for free. Years ago I made a similar board for a Pentacon close-up lens for an enlarger: worked great.

 

A recess of 1/2 in will make little diference in print size.

 

Cheers

[bob_salomon]

Any professional camera store in NY can have a lensboard milled (you don't

drill a board). FotoCare, Lens And Repro, Photo Gizzmmo, Photo Habitat, Ken

hansen Photo, K&M, Ken Mar, Jimmy Koh, Armato and others in NYC or on LI.

[roger_michel]

lens and repro has done this for me while i waited. and it's a fun

place to wait.

[jeff_liao1]

as i remeber that Lens & Repro only drill hole for their customer who bought lens there?? right?

 

thanks

[roger_michel]

that i don't know. the lens they mounted WAS bought there.

however, they do advertize repair services.

[nicholas_f._jones]

Jeff,

 

How did thing work out with the lensboard? I'm thinking of doing the same thing myself, and I'm a little concerned about the fact that the Beseler lensboard is only a nominal 4"x4" vs. 72mm mount size for the lens, i.e. almost 3".

 

Also, did you find that the 810V-XL accommodates the 77x80mm (H/W) dimensions of the 240/5.6 Rodagon without additional adjustment?

[jeff_liao1]

yes Nicholas,

there is a big problem with Rodenstock rodagon 240mm on Beseler 810VXL. Rodagon 240mm has huge rear element if you compare with Beseler 240mm HD. Rodagon is almost 2.5 times bigger than Beseler HD.

And from the design of the 810VXL. i believe Beseler did not design this enlarger for big lens.

i saw one of my friend who custom made a lensboard for this lens on 810VXL. he made a extened lens board, therefore the rear element of Rodagon 240mm won't touch the lens stag adjustment. then it works.

 

for me i am in NYC...

i have this idea about mount my huge Rodagon.

i will buy some stepping rings from 72mm to 62mm...then have a lens board drilled at 62mm. using the stepping rings as entened lens board..then mount the lens

i hope this will work. i will go to B&H tomorrow and try it out...

 

 

Jeff

[nicholas_f._jones]

Jeff,

 

Thanks. Please let me--and the rest of us--know how the stepping ring idea works out.

 

Nicholas

[jeff_liao1]

my idea works...

the image look very bright with this lens...and i don't need to step down to avoid dark coners.

 

here is what you need to mount Rodagon 240mm on 810VXL

A. 3 x 67-72mm step-up ring

B. 2 x 72-67mm step-down ring

C. 1 x 62-67mm step-up ring

D. 1 x Lens Flange "3" shutter

E. a Beseler 4"x4" drilled in "3" size hole

 

steps as following...

1. 67-72 2. 72-67 3. 67-72 4. 72-67 5. 67-72 6. 62-67 7. lens flange with lens board.

 

why use "3" size hole?

because the rear mount diameter of Radagon 240 is 60mm and "3" size hole is 62mm...they work together perfectly.

another reason, there is no lens flane between 72mm - 62mm, and you can not go smaller than 60mm.

why use so many rings?

because the rear elment of lens is long....need 5 rings to cover the lenght

 

if anyone has other easier way to mount this lens, please let me know.

 

Jeff...