I just visited the shop I used to buy all my Praktica gear from way back in the early 1990's, and have "discovered" that he sells a special EOS mount that replaces the Praktica Bayonet mount.
Yes, you have read this correctly, this mount replaces the PB with an EOS mount. It is supposed to work only with the Pentacon made PB lenses, basically the CZJ P 2.8/28, Pentacon 2.4/50, Pentacon 1.8/50 and CZJ P 2.8/135.
How this "mount" works is very simple.
Step 1: set lens to infinity, and smallest aperture.
Step 2: pop off the black plastic sleeve/collar at the centre of the lens. This will expose the entire lens mount, including the screws that hold it in place.
Step 3: unscrew the 4 screws holding the lens mount. The lens mount can now be lifted up and removed.
Step 4: unscrew the 2 screws holding the diaphram release lever. The diaphram lever can now be removed.
Step 5: align the EOS mount over where the PB mount used to be and screw it on, taking care to align the locking pin's lug to the exact alignment as the PB mount's.
Step 6: pop in the black plastic sleeve/collar back into the centre of the lens.
In all of 2 minutes, you have a Pentacon/CZJ lens with a new EOS mount, and best of all, it can be re-mounted back to Praktica Bayonet if you so desire.
OK, that's how it is supposed to work. However, on the lens (CZJ P 2.8/135) I tried remounting this morning, the screw holes on the EOS mount did not align with the lens' screw holes. So, the mount is only attached by 2 out of the 4 screws, and the plastic sleeve/collar. However, it seems quite stable nontheless.
I will try it out on the other lenses I have tonight, to see if the screws are in alignment with the other lenses.
I have not tried it with a dslr yet, as I don't actually have one, so I really do not know if it is accurate at infinity focus.
I will try to see if i can borrow a dslr from a friend, and try it out, and see if this was worth the US$50 I paid for it...
Let's see how this goes...
Oh, and I also saw a custom remounted CZJ 2.8/20 in the shop. The mount was custom machined out of brass, and cost him about US$188 to make. I don't know how well it works though...
Last edited by oloroso (2006-05-01 07:57:55)
Canon 5D mk ii, FujiFilm X-M1, X-T1, Praktica BX20, BMS, MTL-5B, MTL-50.Lenses:
Listed here6 x 6:
Rolleiflex 2.8F Planar TLR, Rolleiflex T Type 1 Black TLR, Seagull 4A-109 Red/Gold TLR