Re: dob tube length vis a vis CMOS imagers
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Hi Gary, again lol. Now that I read you have an F5 mirror you may not need to shorten your truss tube unless as Jack said you use a focal reducer. My scope is an F3.3 so It was built with an adjustment built in.
Mickey
On Monday, May 13, 2024 at 09:03:22 AM EDT, K9RX - Gary <amateurk9rx@...> wrote:
Hello all... so - there are a few guys on here that have done imaging using their Obsession or similar dob. I'm curious what I should expect to have to do with the truss tube length. I have heard, anecdotally, that the length has to be shortened, that there isn't enough 'range' in a typical system/focuser to accommodate a normal CCD system. Anyone have an idea what to expect??
Also I'm thinking of the ZWO 533 as a starter... I want to stay away from amp glow. Note I'm not looking for outstanding images that require hours of post-processing. Just looking to do EAA work for outreach but want a decent enough camera that I can do some longer term (short exposure, lots of stacking) imaging. Thoughts here as well would be welcome.?
Gary Myers
12" F5 Obsession
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