CurtPalme.com Home Theater Forum

[dentree]

Can anyone tell me what would cause my Barcographics 808 to focus drift on the green gun?
To get it back I have to physically re-focus the lens
I have many times set up everything on the projector last thing at night, only to find the following day the green has drifted
Many thanks in advance

[cosaw]

[Curt Palme]

I agree with Cosaw. I have only had this complaint once, many years ago, on a Sony G70 that I sold into Europe. Many emails and fuzzy pictures later, I (and everyone at avsforum) gave up, as we could never see what the problem was.

If you need to readjust your lens focus, and not the electronic in the menus, then you have an optical focus issue. Is there any chance that the HD8 lens base is cracked? I've seen that happen in transit before, that the lens takes a hit, and is now only hanging by 3 (or less) bolts. That would certainly cause lens focus shift.

All three lenses are identical, so you can swap them between tubes to narrow the problem down. if the bolts on the tube is loose, bolting the lens to the frame, that can also cause shifting.

[Curt Palme]

I agree with Cosaw. I have only had this complaint once, many years ago, on a Sony G70 that I sold into Europe. Many emails and fuzzy pictures later, I (and everyone at avsforum) gave up, as we could never see what the problem was.

If you need to readjust your lens focus, and not the electronic in the menus, then you have an optical focus issue. Is there any chance that the HD8 lens base is cracked? I've seen that happen in transit before, that the lens takes a hit, and is now only hanging by 3 (or less) bolts. That would certainly cause lens focus shift.

All three lenses are identical, so you can swap them between tubes to narrow the problem down. if the bolts on the tube is loose, bolting the lens to the frame, that can also cause shifting.