Quote:The reason I ask is that I was using a Mallincam at the prime focus of my C8, and someone asked me what the magnification was. I had no idea how to answer him.
Cliff Mygatt Astronomical League Master Observer
Astronomical League Lunar II & Constellation Hunter programs national coordinator President, Olympic Astronomical Society Bremerton, WA
Orion XT12i Fully flocked with Zambuto Mirror, Protostar quartz secondary and Moonlite CR focuser
Meade 8" LX10 SCT Fully Flocked with Magellan I DSCs
Orion 120mm and William Optics 80mm Refractors Ethos 21mm,17mm,13mm,10mm,8mm,6mm,4.7mm,3.7mm Nagler 31mm and paracorr type 1
Quote:Sounds complicated. I know it had to be more than 40x because I had a very wide split of the Trapezium, even with the Mallincam focal reducer in the optical train./Ira
Quote:There is not a magnification as such, the scope simply creates an image of size X, based on the focal length of the scope and the subtended angler of the object being viewed. The size is in mm or whatever the scope focal length units are.Magnification is How much bigger it appears to your eye, and your eye, nor the eyepiece, is not in the optical chain.So the system and comparison is not applicable.
Quote: "Magnification" is a ratio - the ratio between the angular size of the naked-eye image, and the angular size of the image seen in the scope. Both images are at infinity, and as such only possess angular size. You can talk about magnification in this context because the two images compared are similar.With prime focus photography, one image is virtual, at infinity (the sky itself), the other is a real image, formed in the focal plane. The former has an angular size (is measured in degrees), the other has a linear size (measured in mm). You cannot compare them, so therefore magnification is not defined in this case.