Refractors generally have the edge over reflectors for a quality image, both from the standpoint of lens/mirror quality and precision optical mountings, and lack of central obscurations. Refractors don't suffer from this problem. They are also highly cost-effective when compared to other similarly-sized refractors, as the reflecting telescopes are much cheaper to make thanks to the low cost of manufacturing for the mirrors they use.
While not aesthetically objectionable, it is true that any obstructions can degrade the image a little. The pros of the reflector are that they are better suited for deep-sky observing and have no chromatic aberration, aka ‘color fringing’. Reflecting telescopes, with their secondary mirror (generally with mirror supports), often produce "diffraction spikes" around star images. Nebula Photos 165K subscribers 6.3K 296K views 1 year ago Can’t decide on your first telescope for astrophotography In this video, I give you all the information you need to make an informed.However, the brightness of a nebula is proportional to D2/FL2 since the image of the nebula is also spread out over x and y dimensions by an amount proportional to the focal length (FL). For photographs of nebulae and galaxies, the focal ratio of the telescope is very important! The brightness of stars (point sources) is proportional to D2 (the Diameter of the telescope, and D2 is proportional to the collecting area, pi*R2).These mirrors reflect light at various angles within the optical tube, extending the overall light path. Plate scale (in arcseconds/mm) and the amount of the sky shown on your image depends only on the focal length of the telescope. Whereas refractors use lenses, reflectors use mirrors. Are you interested in a moderately wide field, say enough to capture the Orion nebula? Then a short focal length telescope (and correspondingly smaller plate scale) will get more of the sky onto film of a given size.Are you interested in photographing a very faint object? Perhaps a faint Cepheid variable star? A large reflector will collect a lot more light, and the resulting small field of view is not a problem.Is a reflector better for astrophotography? Or a refractor? Well.
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