Ode to the C4-R
Posted 06 May 2010 - 07:10 PM
K5 Mcnaught is the fuzz ball in the center.
Posted 09 May 2010 - 04:40 AM
I really enjoy sunspot viewing with my
C4R and a white-light filter.
Posted 25 January 2013 - 06:05 AM
I wish it had come with a simple and easy altaz mount instead. I just want to be able carry it out, sit down and start working immediately with both of the remote controls. I have been trying to find an altaz mount, for a reasonable price. The 'Celestron Alt-Azimuth mount' or the 'Skywatcher mount AZ-3' don't seem to be workable options, since the weight of the telescope will not be center-balanced in all positions, but will be hanging to the side, and straining down on a single fastening of the mount when pointing upwards toward zenith, making positioning high up unreliable. The only reliable altaz mounts seem to be big boxlike structures. I have tried to adapt the CG-4 to altaz mode, but it is still kind of awkward and heavy.
This aside, the views through C4-R are fantastic. Mostly I have watched from inside the house out the window. The moon is incredible. I chased it with both remote controls when the mount was in equatorial mode, which was quite difficult.
I feel that equatorial mounts are for proffessionals, and real astronomers who want to make scientific observations of single objects. But for an ordinary observer like me, who want to go star-treading intuitively, and move around the telescope to new exotic locations, an altaz mount would have been much better.
Posted 25 January 2013 - 10:03 AM
Posted 25 January 2013 - 11:59 AM
I keep my C4-R/CG4 set up in the guest bedroom and when I want
to view I pick the whole thing up(legs retracted) and walk it
down the hall and out the door. I plop it down in a somewhat
northerly direction and start viewing. No motors. It's the
only mount I've used so I guess that's why it doesn't bother
me that it's not perfectly aligned.
Posted 25 January 2013 - 03:38 PM
Posted 25 January 2013 - 03:56 PM
Thanks for the tip csrlice12. I will try that. So with that rough alignment, you will follow a sky object with just one remote control nob?
To polar align using a compass, you should account for the http://en.wikipedia....tic_declination, the difference between "true" north and magnetic north.
In San Diego where I am, it's about 12 degrees which is enough to cause difficulties with polar alignment. You don't need to be super close, a few degrees is good enough.
Posted 25 January 2013 - 04:25 PM
Posted 25 January 2013 - 05:00 PM
Jay Reynolds Freeman Astronomy Page
A friend of mine did nearly the entire Hershal 400 in one night with a 4" refractor (TeleVue 101). He got 388 of them using a Go To mount but the fact that he used a 4" scope was impressive.
Your mention of the Herschel 400 reminded me of Jay Reynolds Freeman. He is probably best known for completing the Herschel 400 with his 55mm Vixen Refractor "Big Red." (No GOTO... of course) The other night I was viewing some faint Galaxies with my NP-101 but Jay raised the bar...
Comments on the Herschel 400
Jay Reynolds Freeman Astronomy Pages
Posted 25 January 2013 - 07:45 PM
Posted 25 January 2013 - 08:19 PM
When you have seen enough of an object, and you want to move on, and explore other parts of the sky, . . . that is kind of frustrating with the equatorial mode, because at least one of the knobs (don't remember if it's the RA or DEC) will not move the tube in a straight line, left to right, or up and down, making it difficult to get where you want (sort of like having a steering wheel on a car that is not directly connected to the wheels). Do you move to the next sky object by first checking coordinates in a star chart, and then readjusting the telescope to the same coordinate numbers on the setting circles?
You can move to the next object by checking the coordinates with a star chart and then moving to the coordinates on the setting circles.
This generally requires rather careful polar alignment. To reduce the need for accurate polar alignment, make smaller steps from one object to the next and before leaving an object, make sure the RA and dec are correctly set for that object. If there is a bright star near the object, locate it using the finder and then set the RA and Dec and move the new object.
In general, I loosen both axes and then use the finder and a chart, either paper or electronic, to find that next object by "starhopping."
Posted 25 January 2013 - 08:32 PM
Posted 25 January 2013 - 09:22 PM
Kevin T.: This is more in my line of philosophy, the altaz mounting. Well, I have tried setting the altitude axis to 0 degrees, but it doesn't work completely satisfactory. I understand that turning it to 90 degrees is better. I will try that.
Posted 25 January 2013 - 09:54 PM
Posted 26 January 2013 - 06:34 AM
Posted 26 January 2013 - 11:18 AM
I've also heard of hanging some weight down the middle of the tripod
or placed on the accessory tray.