CurtPalme.com Home Theater Forum

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I am running into a problem with the picture on my Sony 1272. First let me say I have as I said a Sony 1272 with which I am using Crystalimage v 4.0 as a line doubler/scaler. I don't have all the wonderful pieces of equipement that might make this all easier, but I have been working with video projectors for nearly 19 years and I have learned to make do. I have decided to leave the projector, that is running RGBHV, at the factory normal settings of 80 contrast and 50 brightness. I make my adjustments through the scaler. 98% of the time the overall look of the picture is really very good. The black bars at the to and bottom of the picture look very black. The color saturation etc look very close to my direct view montior. The problem comes when I watch a DVD like Star Wars Episode 1. The pod race desert scenes ie. in some areas seem to be over driven and lose all definition. If I make any adjustment to get that back it ruins the rest of the picture. I must be missing the balance of everything somewhere, but I can't seem to get a handle on it. Maybe I'm being picky and I don't watch these movies every day, but it seems to me there should be a happy medium. I would appreciate any help.

On a seperate note I have something which appears to be between the outer adjustment section(corner focus) and the main part of the lens on all three lens. Is there any way to safely to get that part off so it can be cleaned. I tried removing the stud for the wing nut, but the section still would not come off. I would appreciate any suggestions.

BILL

[ecrabb]

Hi Bill,

You're seeing an effect called "crush" or dynamic range compression.

You can't just leave the projector's brightness and contrast controls at default. The projector controls for brightness, contrast, gamma, and greyscale tracking need to optimized. You simply can't use the scaler to correct much, if any of those things if they're not right on the projector first. If the contrast is too low, or brightness too low, you won't have the adjustment range to correct it without destroying the picture quality. It's a little like having a pillow duct-taped to your loudspeaker, and trying to fix the sound by turning up the volume or adjusting the treble control. It's not gonna happen.

What you want to do is properly optimize the projector's G2, BIAS, GAIN, brightness, and contrast settings irrespective of source... That would with the CrystalImage's controls set to "neutral" or off. Once the projector is optimized, then make as little adjustment as possible (if any) with the CrystalImage.

What's your comfort/skill level with electronics - say with the covers off and a multimeter? How about a test disc such as AVIA or Video Essentials... Do you have either of those?

It'll take a little work, but we'll get you fixed up.

On the lens issue. I doubt you have material inside all three lenses. The dust and dirt you're seeing is probably on the tube face and the back of the lens. Have you removed the four philips screws in the corners of the lens mount and taken the lens off the machine? That's where your dust is.

You can just see one of the Philips screws on the lens in this photo:


I take it you're not running any HD sources on your 1272, yet?

SC

[ecrabb]

Hi Bill,

You're seeing an effect called "crush" or dynamic range compression.

You can't just leave the projector's brightness and contrast controls at default. The projector controls for brightness, contrast, gamma, and greyscale tracking need to optimized. You simply can't use the scaler to correct much, if any of those things if they're not right on the projector first. If the contrast is too low, or brightness too low, you won't have the adjustment range to correct it without destroying the picture quality. It's a little like having a pillow duct-taped to your loudspeaker, and trying to fix the sound by turning up the volume or adjusting the treble control. It's not gonna happen.

What you want to do is properly optimize the projector's G2, BIAS, GAIN, brightness, and contrast settings irrespective of source... That would with the CrystalImage's controls set to "neutral" or off. Once the projector is optimized, then make as little adjustment as possible (if any) with the CrystalImage.

What's your comfort/skill level with electronics - say with the covers off and a multimeter? How about a test disc such as AVIA or Video Essentials... Do you have either of those?

It'll take a little work, but we'll get you fixed up.

On the lens issue. I doubt you have material inside all three lenses. The dust and dirt you're seeing is probably on the tube face and the back of the lens. Have you removed the four philips screws in the corners of the lens mount and taken the lens off the machine? That's where your dust is.

You can just see one of the Philips screws on the lens in this photo:


I take it you're not running any HD sources on your 1272, yet?

SC