This means in addition to gathering a lot of light it does it very quickly so you get the equivalent exposure in about half the time or even less. Secondly it has a short focal length (620 mm) which gives it the ability to see a nice wide-field view of the sky and an a really fast f ratio of 2.2 (most scopes would be f 5 to f 10). That bit about ‘at the same time’ is really the crux of the biscuit here because like so many things that have a lot of ‘moving parts’, you can’t do any one thing exactly right that will guarantee yourself a good shot, but doing any one of those things wrong will most definitely ruin your picture.Ī RASA telescope is a contemporary take on an older design of scope that’s strictly for astrophotography–you couldn’t look through a RASA scope if you wanted to because there’s no place to put an eyepiece! This is not big deal because the benefits of this design for photography are tremendous! The camera actually is up at the front of the scope by the lens not in the back where you might expect.įirst of all it’s eleven inches in diameter so it gathers a lot of light. ![]() If you can get all of this working reliably at the same time you can take a pretty decent picture as long as you know what you’re doing after the fact with computer image processing. The telescope needs some support equipment in order to be at its best. The Equatorial mount for the scope needs to follow the sky pretty close to perfectly. Getting that light to the camera’s detector The system involves the basic characteristics of: I recently posted a RASA 11-Inch Unboxing Video on my YouTube channel which you can watch here:Īfter sitting down and analyzing things, it occurs to me that he best way to describe this project is that it’s not really a telescope, it’s a system that involves a telescope! ![]() So after going through the process I thought it might be useful to others to write down how I approached the whole thing in case it might be useful to other people getting their rigs together. In going through the process of preparing the new RASA (Rowe-Ackerman-Schmidt Astrograph) scope for photographic use, it struck me how much is really involved in getting a scope like this ready to do it’s very best.
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