Quote:
Originally Posted by Davekyn
To answer your question:
“I don't know why you are worried about the secondary mirror or why you would want to move it. I think you have your wires crossed there.”
I thought the secondary mirror was the one to move in relation to DSLR Prime focus with Newtonians? If I have this wrong, could you shed any light on the subject?
but I think it’s clear why I thought the mirrors had to be moved.
Thank you for bringing to my attention “the focuser to a low profile cayford style + inclusions of compatible extension tube” This must be dependant on the camera as I can’t understand why people would go to the trouble of moving mirrors for prime focus if this method works.
Here is a specific question for you?
What do you mean by “real Astro Camera” is like that what some call a dedicated digital sensor for astro usually small as if house in something the size of a salt shaker?
PS…For anyone else…
The Other suggestion I found hard to understand was about replacing the “Size of the secondary”.
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you are the chatty one indeed......
ok
1. secondary stays put .
2. Dont cut or modify until other options considered
3. If you want to cut, then its easier to move the bottom miror up, there an article here on IIS that tells you how to do it by someone whos done it (me).
4. You will need a BAADER MPCC (multi purpose coma corrector) this also changes the focal length so check before you buy another focuser or cut
5. Low profile focusers may not be that stable (GSO version isnt) so take that into consideration
6. All cameras will take astrophotos, ones dedicated to only Astrophotography such as SBIG ( Santa Barbara Instruments Group) are specifically desgned for this purose only...... you wont be taking snapshots of the kids with these too often, these are considered "real astro cameras" but hey they all work... some better than others, keep in mind some of these cost over 10,000 dollars.
7. most secondarys are larger than required so a 75mm one might be replaced with a 60mm one ..... this needs to be carefully determined.
there are many modifications and enhancements that can be done , but its best to learn to walk before you run. a 10 inch scope and eq6 will produce fine results, master these then worry about the intricate little things to get that extra 1 % better image.
i use a 12 inch cheap old GSO Newt thats only had a 50mm cut to the rear end no other mods like flocking, smaller secondarys etc
my latest image below. note theres not a lot of difference to a 10 inch so what you are considering is fine.