What is the maximium reducer for LX-200 10"?

[joseph (Joseph)]

Dear all,

I have the LX-200 10", and want to take the photo by Sbig ST-10XME. Ihave both of Meade 4000 F6.3 and F3.3 reducer. I hear that F3.3 isn't good for Sbig ST-10XME, because it is only good for small chip CCD (DSI).

Do anyone know what's the maxmimium focual reducer in the market for LX-200 and Sbig ST-10XME? Is F6.3 the maxmium reducer to be?

Thanks for help.
Cheer,
funoooo

[marki]

The ST 10 working with a F6.3 reducer will give you a imaging scale of 0.89 arcsec/pixel. A bit over sampled but will not cause any real problems. You would have to go down to F5.6 to get an image scale of 1 arcsec/pixel which would be closer to ideal depending on your seeing conditions. Optec in the USA make a F5 reducer with a 17.5mm corrected circle that may do the trick (http://www.optecinc.com/astronomy/nextgen.htm). You could also try moving the F6.3 reducer a little further away from the sensor (standard length is 105mm) to get it but I imagine distortion around the edges would be a problem. The F3.3 reducer only produces a 9mm corrected circle so is far too small to be of use.

Mark