Quote:
Originally Posted by Brycepj
Rom thanks for you advice. so basically I should be looking at either a reflector or refractor on alt Az mount providing the refractor is 100mm.
I have discounted the reflector after read about collmination issues and is it true that the images are reverse/mirror images ? Should I still look at Apo refractors? What 2nd hand sites can you refer me to that are trustworthy and reasonable
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For simplicity,
- I'd go for a 10 to 12 inch Dob, with a low F ratio say F4 or F5. Size may be an issue with the 12"
- For a refractor, I'd try for a 100mm, (Just that bit bigger) on an alt-az. Later on, you can move this over to an equatorial.
Its true reflectors need to be re-aligned frequently compared to a refractor, but the process is pretty simple and there are lots of tutorials on how to do it.
In all astronomical scopes, the image is inverted but there is no up or down in space, so its irrelevant. You can get a gadget that will flip the image back but its just one more element that robs you of light. For a refractor, get an apo because it gives a better image than an achromatic lens, no / little false colour.
Generally, astro sites are pretty reliable but its a case of buyer beware. The classifieds on IIS are a great source of gear and I use the site often. This is another:
http://www.astrobuysell.com/au/
If you see something that appeals, ask other people their opinion. Most are quite honest and only to willing to help. Sellers often have an extended history of posts and you can get an idea of what they are like.
Rom