Hello everyone, I was outside last night here in southern New England viewing Mars with my 10.1" f4.5 and must say I had great success!! With a 12mm eyepiece...
I'd go for a barlow next. A 2.5X or 2.8X is always nice to have for planets. I live at 43 degrees N Latitude so 250X is about as much power as Mars will take....
... Try http://www.handsonoptics.com/used_equipment.html they usually have a used set in stock for $79.Bought mine there.Make sure it comes with the book....
... southern ... have ... 321x can be a chore to track by hand...You'd probably be happier with the 192x ... lose?) For lunar and planetary viewing, you might...
Neal, My scope uses a DX-1 focuser. There are 4 allen screws at the base. I am at a bit of a loss to understand how they are supposed to function on...
I'm trying to settle a disagreement. Does an off-axis aperture mask effectively reduce the aperture on a reflector, and as a result reduce the resolution? One...
BTW, the person who says that it doesn't reduce the effective aperture of a reflector *does* agree that it reduces the effective aperture on a refractor. ... ...
There is an interesting notion in science called empiricism, which means that you should try it and find out for yourself. If you dont want to wait for a clear...
I found that reducing the aperture did increase the detail I could see on Mars at low altitude. It also helped to make sure that Mars wasn't too bright. I've...
Without a doubt it reduces the aperture of both types of telescopes. The light beams are parallel when they enter the aperture. The short distance travelled...
By now you already know that your friend was wrong. An off-axis mask DOES reduce the effective aperture...regardless of whether the scope is a reflector or ...
There is also another natural mask going on....the pupil of the eye. I hear very little as to the relationship the pupil has with this thread. Observing with...
PS, mind if I copy that and upload it as a FAQ file in two of my groups? John Kagey ... ________________________________________________________________ The...
Neal, You make a very good point. This thread is similar to one on my local astro club's Yahoo group, some of which I will paste into this message. In that...
All, I'm looking for the pro's and con's between say and F6 and an F4.5 mirror in regards to an 8" dob I'm building. I figure this is a good place to get...
The difference will be little between these two. The F 4.5 needing higher quailty eyepeices such as naglers to give "sharp to the edge" views, and perhaps a...
Bob, An F4.5 will have much more coma than an f6, and be much more sensitive to collimation. It will have a shorter tube, and thus a bit more compact. An F6...
John...in response to your earlier post: The Apodizing mask is quite different from an off-axis aperture mask but, yes, I HAVE tried it with similar groups of...
I live in a city, not downtown mind you, but the lights are only a few miles away...and I have a street light about 50-75 yards from my house. While I'm a...
a filter wont help with the light. You have a few options. 1- have a light shield put on it so the light is forced more downwards. 2-set up a laser to shine on...
I have recently started observing with a Meade ETX70AT and have enjoyed it, but have decided to try something bigger. I saw an ad in astronomy magazine for a...
Mark...relative to isolating one quarter of the mirror which may have a better figure. I have an aperture stop that connects to the central bolt, which holds...
I currently have a cheap Orion Lasermate Clone laser collimator (ok, I should have spent the extra bucks to get the true Orion Lasermate). My clone Lasermate...
I got rid of my laser and only use techtron tools now. I keep a white light flashlight handy for those rare occasions I have to collimate in the dark. John...
Mark: You make (below) the single point I wanted to make in this discussion. All other things being equal (meaning that the mirror has cooled to the ambient...
... (ok, ... working ... be ... I'm planning to buy Howie Glatter's new barlowed laser collimators. I understand he had a few samples at BFSP and that he is...
