Afocal Astrophotography Update for 2008 onwards: I now have a 4 inch F6.
5 Celestron Nexstar on a GOTO alt az mount it works just as well for afocal imaging as the 8.5 inch better on flak jacket oakley large objects in fact. Update for 2010 onwards: well, I finally went down the DSLR route and started prime focus imaging. I did seriously consider a new P oakley sunglasses closeout but it is now very difficult (almost impossible in fact) to find one with a threaded lens. Anyway, for what its worth, here is how I used to do it. Pros and Cons of Point digital cameras cf DSLRs You will often see it said that DSLRs are better because their CCDs have larger pixels which can hold many more photons and hence oakley sale sunglasses reduce the random noise. For everyday photography this is true but the reason this works is that DSLRs have much bigger lens apertures and so collect much more light for a given exposure and F number. In astronomy, the amount of light is fixed by the telescope not the camera lens, so this advantage vanishes (except see below!).
my 2020Z has a 6mm focal length at f2 => sale oakley sunglasses outlet 3mm aperture. A low power eyepiece for optical viewing may have, say, a 6mm exit pupil, so I am effectively limiting my telescope to one of half the aperture. Zooming in, either with the camera or the eyepiece, helps (gives a larger camera aperture or smaller exit pupil) but, of course, reduces the field of view on theHow To Image DSOs The basic idea is to take lots of short.
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