Hi,
I bought a beseler on ebay but it has a lot of glass chips and dust inside.

Does any one have experience in dismantling the 18 EFL Beseler so I can clean it?

You should be able to backoff a ring on the backside of the lens. There should be 2 notches located on opposite ends of the ring for you to turn ccwise. The ring compresses the lens and spacers toward the front of the barrel.

Once the ring is removed you can unpack the pieces and clean each. I use a suction cup to pull the lenses when unpacking and packing, else you end up with chipped edges. Don't forget to remember and/or mark each lens so you repack it correctly

Well, at least that's how my triplets unpacked. Good luck.

I was trying that but its way too tight. am i supposed to be turning it counter clocckwise?
If so what did you use to back it out? I am using a flathead screwdriver and a small hammer.

Should be ccw based on the 3 triplets I've done. They can be a pain to remove. I'm sure there's a proper tool for this, but I used the same method - alternating tapping between the 2 notches. You might want to protect the glass before you get frustrated and more aggressive

If you get desperate, maybe the standard methods for releasing auto nuts/bolts would help - lube, heat, etc.

WD40 or Dot 3 lube added that help to disassemble mine. There is the issue of any chemicals on any lens that may cause damage to possible UV or polar type filter inlaid on the lens itself but I don't think there is any on the 18" Beseller that I know of. Anybody?

I don't think there are any filters, but there is usually an extremely thin anti-reflection layer that could easily be damaged by chemicals or almost any force beyond light buffing. It would be better to build a tool. Shouldn't take more than a few minutes with a pair of big nails, a foot of 2X4 and a grinder. I'd make sure the nails are too short to actually touch the glass for extra safety.

The heat method mentioned previously is a good option. The mount is all metal on most opaque projector lenses and could easily be heated with a hot rag to make it expand and loosen the threads. It should practically fall out.

Good luck.

BTW, I know where you can get one without a bunch of crap inside it. Cough...Trading Post...Cough

Thanks for all the replies guy but I got it out. I wish I had checked back before I did what i did

First i thought about drilling a hole to flush out the lens but then i would not be able to dry it properly. then I decided to carefully cut a slot on the ring and just pry it out.

The ring goes back in and hold the lens but not as tight as before and I decided to use a little hot glue to make sure the ring doesn't fall out by mistake.

Why oh why didn't i check here first? I may still be Interested though.