Member Avatar for Duki

Hey guys, I am in desperate need of a monitor with the following specs:

* 21” or larger CRT
* Horizontal Frequency = 30-115 KHz or greater
* Vertical Frequency = 50-160 Hz or greater
* Recommended resolution of 1280 x 1024 @ 120 Hz / True Color
* Required resolution of 1280 x 1024 @ 100 Hz / True Color (preferably 100Hz+)

Can someone help me out? It can't be the ViewSonic G22fb or whatever; we've had 3 of those go bad in the past 6 months.

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Dani AI

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: the 100–120 Hz target makes sense for active-shutter stereo — you want at least 50–60 Hz per eye to avoid obvious flicker and motion artifacts. asked the right question: higher total vertical refresh reduces flicker and improves stereo fusion.

Practical points to help the search and setup:

  • Look for pro/graphic CRTs from Sony, EIZO, NEC or Barco that list wide horizontal (>=30–115 kHz) and vertical ranges to cover 1280x1024 at 100–120 Hz. Many consumer CRTs will not advertise sustained 120 Hz at that resolution.
  • Because CRTs are discontinued, buyers markets are used/surplus. Inspect for focus/brightness uniformity, convergence, and signs of overheating or intermittent degauss failures before purchase. A known-good power-on and warm-up test is worth insisting on.
  • Confirm the GPU and analog output can drive the mode. Use the video card control panel to add/verify custom timings. If a monitor refuses a mode, check H/V sync ranges rather than only the vertical rate.
  • Cable and sync matters: use high-quality analog (VGA) cabling and try separate H and V sync where supported. Bad cables or incorrect sync polarity can prevent stable high-refresh modes.
  • For verification, run a refresh/flicker test at your intended stereo rates (tools that animate bars or alternate frames are useful) and confirm both eyes see full frames with the glasses system you use.

If 120 Hz at 1280x1024 proves hard to find, consider:

  • Running 100 Hz (50 Hz per eye) with motion smoothing tuned to your workflow, or
  • A dual-display stereoscopic rig (one display per eye) which trades cost and alignment work for lower per-display rates.

These checks should make sourcing and validating a CRT for stereoscopic 3D more reliable.

Member Avatar for darrglud

Can I ask why it needs to have such a high refresh rate?

Member Avatar for Duki

we use 3D imaging that takes two images and (with special glasses) "tricks" your brain into thinkings it's one 3D image. We use it to calculate the size of coal fields; much more effecient than sending out a surveying crew. Just fly over, take a few pictures, bring it up on the computer, and map it out.

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