Last updated: 6 November 2002
Subject: Photography : Semi-autoguiding Sent: Monday, November 4, 2002 19:50:05 From: email@example.com (Adrian Vergot) Even though the ETX motors in general have a lot of slop with respect to guided photography, the ETX-70s wide angle 350mm focal length should be fairly forgiving. Subsequently, I decided to try setting up a pseudo autoguider since I hate hunching over a reticle eyepiece worrying about bumping the scope. Below is a photo of the assembly, though a simple cheap black and while TV set would do just fine in place of the laptop PC simply get a guidestar on the TV screen, draw a tight circle around it with a dry erase maker (if using a PC, simply place the tip of the mousepointer directly on the star image), and using the ETX paddle buttons keep it centered within the circle (or on the mouse pointer...). I have included my first test picture of the Orion Nebula, taken at prime focus with a nebular filter for 5 minutes using Fuji-Superia800 film. On a side note, the video camera and Quantaray lens perfectly offset balance the OM1 camera, so that no counterweights are necessary... 8^) Adrian ETX-70 SuperCircuit .0003 lux C-mount video camera C to T mount adapter (Orion Telescopes) Quantaray 500mm Mak T-mount lense (Ritz Camera) PC with video-in Battery Pack OM-1
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