What thread size these enlargers use on the lens board?

[MattAndre]

Durst M301 questions
I'm guessing smaller than 39mm, so the other question is; are there lensboards which fit these enlargers AND have a 39mm thread? Also, anyone know of a parts source for Durst enlargers? I got this one free but it's missing the bulb cover and the negative tray/carrier. Thanks in advance...

 

[MARTIE]

Durst flat lens boards/panels are named Lapla available in standard 25mm and 39mm thread sizes.
However, in order to print 35mm with a 50mm lens you'll need a recessed lens board.
Durst Siriopla and Siriotub should also fit.

It is possible to find or make 3d printed versions.

 

[MARTIE]

For parts, it will probably be easier and perhaps cheaper to find a second enlarger.

 

[MattKing]

The manual for the M305 (not the M301) says this:
3.1.7 Lens panels
A flat lens panel (12) is supplied with the Durst M 305 to take 50 mm lenses with M39×26 tpi screw thread.
The following lens panels are available separately to order for the 35 mm and 28 mm lenses:
35 mm: NERIOTUB
28 mm: NERIOTUB
Here is that manual: http://www.jollinger.com/photo/cam-coll/manuals/enlargers/durst/Durst_M305.pdf
that link comes from the Jolllinger enlarger (and other things) manual page, found here: http://www.jollinger.com/photo/cam-coll/manuals/manuals.html

 

[MARTIE]

This is from the M601 which is the medium format version and had very similar production dates.

 

[Petrochemist]

The most common size for enlarger lenses is M39, but I also have some in M25 & M42.
Each of these are far enough apart that they can easily be identified.
Enlargers usually have lens boards that allow multiple size lenses to be used.

 

[xkaes]

There are lenses with 32.5mm as well.