Are telescope reflector mirrors similar to the mirrors we use in the house?
Monday, April 20th, 2009 at
1:26 am
Susan Asked:
can you use regular house mirrors as reflector mirrors for a homemade telescope reflector?
Reply:
ou CANNOT use household mirrors in telescopes.
Household mirrors are flat, whereas telescope reflector mirrors need to be round, so they can reflect the light to the eyepeices.
US $95.61
when was this video taken
Meade 114eq-astr 114mm Equatorial Reflector Telescope
when was this video taken
Hi,I’m interested in buying a 114mm skywatcher telescope…I’m begginer so can you make review of that telescope,please?=))
I suspect that the 650 mm and 900 mm to which you refer are focal lengths and not mirror diameters. A 65 cm (26 inch) or 90 cm (36 inch) mirror is a very major instrument costing tens of thousands of dollars.
Focal lengths are not so important. Since you are looking at a reflecting telescope probably the most important point is the diameter of the objective. You don't give this figure but you can probably get anywhere from a 10 cm (4 inch) to 20 cm (8 inch) diameter objective in that range of focal lengths.
The diameter of the objective is the key parameter in light gathering power. A bigger mirror collects more light and thus makes fainter objects visible. Focal length than does have some bearing, longer focal lengths enable greater magnification for a given eye-piece. A longer focal length also tends to make collimation less critical. However the tube will be longer which may affect portability or other use considerations.
For planetary observing one is usually looking for a long focal ratio F/8, F/10 or even more. For deepsky observing one is generally after a shorter focal ratio such as F/5 or F/6. At F/4 and shorter collimation a very important, as is the quality of the mirror shape.
You also need to think about whether you want and equatorial mount or an alt-azimuth mount like the Dobsonian.
New Blog Post on Reflector Telescope you can find it here
What magnification is that taken at?
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