Need advice for a finderscope
Posted 06 February 2013 - 01:26 PM
I'm currently using the standard Celestron 6x30 finder on my CGEM925, but I want to upgrade. It's very annoying when I'm doing the alignment and a star right above (in Holland we call it zenith, in US also?) you to look through the finder.
I'm only sixteen years old, so I don't need the best of the best but still a nice one to use
It doesn't matter if you sent links from American resellers!
Posted 06 February 2013 - 01:28 PM
Posted 06 February 2013 - 01:31 PM
Posted 06 February 2013 - 02:08 PM
Posted 06 February 2013 - 03:07 PM
Posted 06 February 2013 - 03:22 PM
I use the Orion RACI finder on my Celestron scope and it works fine. Bed sure to order the Orion SCT-style finder shoe since the finder will not fit in the stock Celestron shoe.
I took the 9X50 Orion RACI off my 10XTi and put it onto my 102XLT and it fit fine. Bought another and put it on my dob, same footprint....
Posted 06 February 2013 - 04:31 PM
Posted 06 February 2013 - 07:23 PM
Posted 07 February 2013 - 04:28 PM
Posted 09 February 2013 - 12:24 AM
90degree telrad is nice..
Posted 09 February 2013 - 10:03 AM
Posted 09 February 2013 - 10:17 AM
Yes i did, but I'm not sure what is the best choice for me. So thats why I'm asking you
Do you think you need a magnifying finder?
If you are just using the finder for alignment, a red dot finder maybe a better choice. There is no doubt that a right angle finder is more comfortable than a magnifying straight through finder but if the GOTO doesn't put the alignment star in the field of view of the Right angle finder you are stuck.
A straight through finder can be used with both eyes open much the same way one uses a red dot finder, one eye sees the cross hairs and the other eye sees the star field. Once the star is in the field of view, you close the other eye and center the star with the magnifying finder.
The awkward position of the straight through finder is the problem.. Do you have an adjustable observing chair so you could lower the seat down an view more comfortably when the guide star is near the zenith (you had that one correct)?
Posted 09 February 2013 - 10:24 AM
Having a finder that produces a correctly oriented image such as one would see in a binocular but that is presented to the observer at a right angle (RACI), is the best accessory that I have ever installed on my telescopes. One with a five-degree (or a little more) field of view is just about right. You are on the right track in my opinion. Here is another site for comparison shopping: AgenaAstro
Even with a 'go-to' mount that doesn't require continual navigation via finderscope, I find it indispensable for seeking out and exploring those nearby objects not listed in the hand-controller's database. I find the confinement of ‘go-to' is like taking a train tour of the night sky – I’m only able to visit the places where the train stops. By comparison, the finderscope can be very liberating when it is comfortable to use; and, hence, my appreciation of the opportunity for right-angle viewing.
I have not found illumination of crosshairs to be essential. It is very rare that I have been in a dark-enough location where I was unable to see my plain crosshairs but YMMV.
One characteristic that surprised me about using my RACI finders is that they do not point well. When seated at my dobsonian telescope (wide aperture, low to the ground), I cannot tell where the finder and telescope are pointing in the dark. That fact makes it difficult for me to get the telescope pointed to a specific object that I can see plainly with my unaided eyes. I overcame my pointing problem by installing a very inexpensive red-dot finder on top of the RACI finder. Problem solved! The ‘pointing’ problem manifests itself to a much lesser degree with my refractor which seems to have its own natural pointing ability.
Were you to find this pointing issue to be a factor in your case, you may find yourself wishing for some type of auxiliary pointing device. And, of course, it wouldn’t help with your initial alignment as much as you expect. On the positive side, it’s not likely to be a show-stopper in the alignment of a refractor on your CGEM. Clear skies to you,
Posted 09 February 2013 - 10:38 AM
Posted 11 March 2013 - 09:32 PM