Any tips on Manual Focus? (Hitachi swx20b) - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 12 Old 10-19-2002, 10:48 AM - Thread Starter
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I'm thinking about doing a manual lens focus (mechanical) on my Hitachi 57swx20b this weekend.

Having never done this before... anyone have any tips?

1. how to access the lenses, open up the screen, etc.
2. what to watch out for
3. how not to get eletrocuted
etc.

I know that Mike may be putting together information on this around Thanksgiving, but I was hoping to do this sooner.

Thanks!

Steven
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post #2 of 12 Old 10-19-2002, 09:36 PM - Thread Starter
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Lot of information. Got it Mike. Thanks!

One thing I'm having a problem with though.. how do I adjust the manual focus since I have to remove the screen to do it ?

Without the screen on the set, I have no idea how my change is effecting the focus... I'ld have to keep putting the screen on the set, checking, taking off, adjusting, etc. Does that make sense?

How else to adjust the manual focus?
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post #3 of 12 Old 10-20-2002, 05:25 AM
 
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Sounds like a good question to ask in open forum...

Manual focus of the lens barrel assemby is the only tweak I have yet to do.

From what I sent you, I am sure you can tell I am getting ready though. My set is over 1 year old, and I think it's time to clean the optics and re-adjust it.

Ask Mr. Bob at www.imageperfection.com or go hit the ISF guys site at www.digitalfilmforum.com

Kevin Miller, Jim Burns ect... Should know some more info. You could send Cheezmo or MichaelTLV a PM here at AVS too... Or Hit ELiab and Chuck williams at the spot in the ask a calibrator section. Try David Abrams here at AVS too. These are the guys that I ask questions when I don't know.
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post #4 of 12 Old 10-20-2002, 07:05 AM
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Quote:
Without the screen on the set, I have no idea how my change is effecting the focus... I'ld have to keep putting the screen on the set, checking, taking off, adjusting, etc. Does that make sense?
Yes, that makes sense. I often do it that way. You can mark the starting position with a sharpie and make small 1/8" or less adjustments to the focus rings then check and see if you are going in the right direction.

Alternatively, go in from the back of the set and do the same kind of thing. You can tape paper on the screen and look at the focus on that when you are focusing from the back or you can just use the other method but walk around the set each time instead of having to take the screen on and off.

Mr Bob's cantilever technique (search around, you should be able to find it somewhere) is a good way to tell if you have nailed it or can try to improve it a little one way or the other.

Steve Martin
former ISF Calibrator
If you can see my pixels, you are sitting too close.
Sony XBR75X940D, Sony XBR55X930D, Samsung UBD-K8500, Oppo BDP-103, Oppo BDP-93,
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post #5 of 12 Old 10-21-2002, 03:05 PM - Thread Starter
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Okay.. attempted to manually focus the blue lens last night...

It seems that the more I turn the lens clockwise, the tighter the "focused" beam becomes.. however, the "halo" around the focused blue becomes larger and more purplish in color.

Then, if I turn the lens counterclockwise, the larger the "focused" beam becomes, and the smaller the "halo" becomes.. which also takes on a greenish color.

What is the intent here? Am I trying to set the lens at exactly the point where the halo turns from purplish to greenish?

Am I trying to really make the "focused" portion of the blue tight? (which would mean really turning clockwise).

Really pretty easy to do this.. and if you are careful and mark where you started... doesn't seem too bad.
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post #6 of 12 Old 10-21-2002, 04:00 PM
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Right. Try to keep the halo to a minimum. You definitely don't want it going green on you or you will have grayscale problems. Blue is the hardest of the 3 since it doesn't focus up tight like the other two. Just do the best you can.

Steve Martin
former ISF Calibrator
If you can see my pixels, you are sitting too close.
Sony XBR75X940D, Sony XBR55X930D, Samsung UBD-K8500, Oppo BDP-103, Oppo BDP-93,
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post #7 of 12 Old 10-21-2002, 06:57 PM - Thread Starter
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Okay..

So we try to make the halo as small as possible while keeping it blue?

This also means that the "focused" part of the blue will be larger. (cause you could make the focused part tighter while at the same time increasing the halo).
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post #8 of 12 Old 10-21-2002, 08:12 PM
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The Hitachi service manuals describe it exactly as you did before. Adjust it to the point that the "chromatic aberration" turns from purple to green.

Steve Martin
former ISF Calibrator
If you can see my pixels, you are sitting too close.
Sony XBR75X940D, Sony XBR55X930D, Samsung UBD-K8500, Oppo BDP-103, Oppo BDP-93,
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post #9 of 12 Old 10-22-2002, 06:23 AM
 
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Hey Steven, (Sthong)

Can you take some pictures and then explain here in this thread the procedure for focus and mabey even take or send me some pictures?
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post #10 of 12 Old 10-22-2002, 09:18 AM - Thread Starter
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My digital camera just got nuked by a coffee cup.

When I'm back up and running, no problem.
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post #11 of 12 Old 01-17-2003, 06:21 PM
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sthrong

Sorry I missed the fun.

https://www.avsforum.com/avs-vb/showt...hreadid=197296 is how to lens focus without the screen in place.

Regards, Dick
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post #12 of 12 Old 09-25-2003, 09:03 AM
 
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Quote:
Originally posted by sthong
My digital camera just got nuked by a coffee cup.

When I'm back up and running, no problem.
:eek: !:eek: !:eek: !:eek: !

NOt good-
You back up and running?
You still around?



Quote:
Originally posted by dickmc

Sorry I missed the fun.

https://www.avsforum.com/avs-vb/showt...hreadid=197296 is how to lens focus without the screen in place.
Thanks for the link... :D Great Post :D
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