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ACT LABS lightgun (VGA/USB model) ... calibration offset by ~100 pixels

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ARTIFACT:
(on a CRT monitor, plugged via VGA > RGB via BNC leads adapter)

the title says it all

Am I not calibrating right? ... the instructions are VAGUE at best ("wave slowly back and forth...")

It seems to work with my monitor, I can shoot and it moves the cursor BUT it is off by 100 pixels both vertically (toward the top) and horizontally (toward the left)

Do you know if this is a sign that it won't work at all with my monitor/setup?

I currently have a gray smoked plexi in front of my monitor. I haven't tried without yet. Could this be the issue?

THANK YOU!

ARTIFACT:
OK the act labs guys are GREAT

they replied to my email (which was essentially a copy/paste of the post above) and they already got back to me (within hours!) with a long and detailed list of advice on how to calibrate the guns correctly.

I will apply what they said tonight, and hopefully the gun will work well :)

thumbs up to the Act Labs guys.

weaklink:
I hope you'll share the calibration procedure.  I've been really disappointed with the gun's performance.

ARTIFACT:
To summarize:

. in the dark (turning off room lights / 6 recessed flood lights) it works ok
. still have about ~30 pixels offset too high vertically (that's "ok"...)
. works beautifully in Model2 / House of Dead, etc
. CANNOT play in MAME ... set lightgun_device lightgun, etc... but the issue is that the gun button is not triggering the "Button 1" in MAME... Hitting the Happ pushbutton manually "shoots" where I last shot the gun.... WEIRD. MAME config???

I had fun in HOD though :)

mrudie:
Any chance you can share everything that Act-Labs sent you for calibration help? (copy and paste?)

Mine is offset a little high and to the right.  The calibration instructions are pretty vague.

Thanks....

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