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I use a Lumicon Illuminated 12mm Kelner with double crosshairs, variable illumination, adjustable focus for the crosshairs with pulseguide that controls on/off time for illumination. Bit OTT and pretty old now but great for centering autostar/synscan guide stars and drift align, wouldnt part with it.
They are still available now with 12.5 ortho about 100USD + 50usd for pulseguide option.
Chris
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