Re: dob tube length vis a vis CMOS imagers
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Gary,
Can you shorten the tube length?? The purpose of the truss system is to hold the secondary mirror at the correct focal length away from the primary mirror.? Seems to me if the focal length is 1524mm (60 inches), that it has to stay at that length.? Am i missing something?
On Mon, May 13, 2024 at 9:03?AM K9RX - Gary via <amateurK9RX= [email protected]> 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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