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Post by Casethecorvetteman on Apr 8, 2016 7:24:59 GMT -5
Hi all  ive got 1 HFQ900 that keeps going slightly out of adjustment over the course of a week or two, i know it is because re-adjusting it brings it back to flawless very easily. Id say its either moving as it warms up and not moving as it cools, or vise versa. The lens on my red is right where i left it a week ago, hasnt moved at all, but the one on my green seems to keep going out. I tighten the knobs firmly and recheck its spot on, and a week later its moved enough to be just slightly out. I remember my HD-144s did this at one point but cant remember what fixed it, does anyone have any sugestions? |
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Post by Casethecorvetteman on Apr 16, 2016 7:45:51 GMT -5
Still having this issue but cant seem to see why it is happening, i just watched a full movie and it stayed spot on, then played Wii U for 2 hours and green optical focus was way out by the end.
It did this with the other green tube too, which was factory mounted and factory filled, so its not the glycol or housing, seems to be an issue with the lens moving. The lens was barely warm, so i dont know why it would do it with one source and not others.
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Post by hulio on Apr 16, 2016 9:25:45 GMT -5
This is strange indeed, Case. There are few things I would check:
1. Dismount the tightening knobs and check if there are two washers in this order: a rubber one against the lens-barrel and a metal one.
2. Check if the scheimpflug mechanism is locked.
3. Dismount the lens, keep it vertically between your hands and start shaking strongly. If you hear something, a lens-element inside could be free.
4. To exclude the optical path, mount the lens on other colour. If the problem does not follow, it's not the lens fault.
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Post by gregstv on Apr 16, 2016 15:58:37 GMT -5
Swap it for the red and see if the problem moves
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Post by Casethecorvetteman on Apr 16, 2016 16:53:01 GMT -5
Ive just turned it on and checked it again, its gone back to dead perfect over night.
I swapped it with the blue last week, and it still does it. The lens flapping is locked, but it does this with two different greens in two different housings.
The lens is done up tight to the LC housing, so id have to think something in the lens is moving somehow, but what?
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Post by Casethecorvetteman on Apr 16, 2016 16:55:09 GMT -5
Seems funny that it doesnt do it during movies, but only seems to be an issue when playing Wii U, and the Wii U is connected into the back of the OPPO, so the signal is theoretically identical.
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Post by Casethecorvetteman on Apr 16, 2016 19:53:23 GMT -5
Is there any negative in tightening the nuts on the springs?
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Post by hulio on Apr 17, 2016 4:58:04 GMT -5
No, but it won't help neither. Beside, they should be maximum tightened already. Those big bolts are not threatened over the whole length.
The eccentric mechanism (half-moon shaped) dictates the scheimpflug position, while those big springs put more or less pressure.
Even with the bolts maximum untightened, you'll have enough pressure to tweak the scheimpflug.
I still think is not the lens's fault if it happens only with another source (resolution). I'll schratch my head further, Case.
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Post by Casethecorvetteman on Apr 17, 2016 5:15:11 GMT -5
I spent a couple hours on it today, pulled the lens off and inspected it, it seems perfectly fine, correct washers etc.
I then left it run for an hour before i fully tightened the lens, refocused everything, adjusted convergence, and so far after 4 hours of Mario Kart it seems to have stayed where i left it, but ill watch a bluray now and see what it does.
I took the HDMI from the AVR out of the OPPO and sent it direct to the MOOME, there was 2 spare inputs on that. I cant see where this would have an effect, but there is no question it was lens focus and nothing electronic.
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Post by Casethecorvetteman on Apr 17, 2016 6:42:53 GMT -5
It moved during the bluray, but the opposite way...
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Post by hulio on Apr 17, 2016 8:12:12 GMT -5
What is shifted Case, the front lens-barrel (corner focus) or the rear one ?
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Post by Casethecorvetteman on Apr 17, 2016 9:03:58 GMT -5
Rear one, if i adjust it the whole screen is perfect again, the front one doesnt seen to move at all.
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Post by Casethecorvetteman on Apr 20, 2016 7:42:48 GMT -5
Ive done some testing tonight, after having a play around with my spare HFQ900-HM lenses last night, i found that no matter how tight the lock nuts were done up, the rubber washers did not grip the aluminium lens barrel at the back. After further tests last night i noticed that the red is also moving, just no where near as much.
I removed the nuts and washers, and stuck some electrical tape beside the slots, with the plan being that the rubber washers may grip the tape better, and the tape should stop the movement.
With tape on the green and lock nut tight against tape, the green seems to have stayed put after 3 hours of operation, and the red without tape did move very slightly. It only takes 1mm of movement to defocus enough that scanlines are not visible. Ofcourse you cant see those scanlines from the lounge chair, but it still has an impact on ultimate sharpness that CAN be seen. I have now got tape on both red and green, and will see how it goes tomorrow.
It wouldve been nice to have a knerled surface where the rubber washer grips to prevent movement, because that aluminium barrel is very slippery to the rubber washer.
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Post by Casethecorvetteman on Apr 20, 2016 7:44:39 GMT -5
This red is a factory installed original tube, original glycol, with original red c-element.
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Post by Casethecorvetteman on Apr 24, 2016 10:18:32 GMT -5
So with the tape in place the red has not moved, but the green did, it pushed the tape and wrinkled it. The lens barrel was cool to touch.
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