I’m not familiar with that lens, but usually it is necessary to remove the ring to get access to the front lens elements.
You probably will have to encourage that ring somehow. Try to hold it evenly without pinching and use some sort of rubberized cloth when unscrewing and maybe use some sort of strap wrench to get it started. Good luck!
No entrance through the rear!
See photos.
The front and middle lens are screwed together in one unit which is released by the thread of the “hood”.
Note my early 36cm has a much more substantial hood.
The Heliar “aluminium” is both very brittle and subject to locking corrosion in the threads!
For stuck aluminum threads Mouse Milk Oil works great.
Wrap a heating pad around the lens and warm it up a bit, NOT HOT, just warm the aluminum up a bit.
Use a little, just a few drops, and let it sit for a few days.
If it works, wash the threads with soapy water, rinse the threads in hot tap water, and then dry with paper towels before re-assembling
Just Google it
Last edited by Greg; 6-Dec-2020 at 17:23. Reason: added additional info
https://www.largeformatphotography.i...ght=Hose+clamp
Followed the link above by using a 4-5 in diameter hose clamp, I successfully unscrewed the front element from my heliar lens and cleaned haze inside the lens. Thanks for all your information.
That had to make you smile! And what a nice looking lens.
Bookmarks