Gidday all I use alt az mounts most of the time. If, for example, I do 100 secs of stacks of 5 sec integrations on Sharpcap , does the program compensate for the rotation that occurs over that 100 secs or is it better to use an EQ mount.
Have my Lx 90 with me on the beach holiday. Back home the skies have been clear. I am pretty sure beach means clouds. Paul
Gidday Paul. Sharpcap ver 2.7 onwards will stack and derotate.
Do you understand the difference between star trails and field rotation BTW? And that you can actually go a lot longer than 5 seconds per frame when doing Alt Az? All explained here ... calgary.rasc.ca/field_rotation.htm
. . . . Have my Lx 90 with me on the beach holiday. Back home the skies have been clear. I am pretty sure beach means clouds. Paul
Don't worry Paul, it's been thunderstorms all day here and rain at Bendigo, so you aren't missing much
__________________________________________ Ken James - Snake Valley Australia CAMERAS: Samsung SCB-4000, Mallincam Xtreme & Xterminator, 3 different Revolution Imagers, 2 ToUcams, SX-5c, Canon 350d, 2 different IMX224's (an RI & RT) and an RT178. Broadcaster on NSN as 'Snake Valley Australia' HERE --> www.nightskiesnetwork.com/ - Video Astronomy Website: ballaratman.wix.com/videoastronomy
Well, some parts of the sky you can only go 6 secs longest exposure, and other parts 90 seconds or more if your Alt Az mount has good gearsets and motors. Here's the table for my latitude ... would be a pretty good start for your area ... PS my old Nexstar mount could only manage 45 seconds or so, but I have seen on NSN Mark Bahu go 90 seconds with an Evolution mount. Hope the sky is clear and you have fun.
I have just read this thread, LX90 and with Hyperstar very nice but as Howie said it depends on what parts of the sky your in. But with Hyperstar I would have thought it does not matter. What I have seen Dave Hudson do is 4 to 10 sec exposures live stack .
Is not that the beauty of Hyperstar fast optics quick exposures and the software stacks and aligns !
BTW no clouds here just hot hot hot and lots of holiday makers. No room on the beach!!!!!
Thanks Guys I wasnt sure if sharpcap derotated with stacking.That has been answered.
My asi224 will sit on the celestron 6se with hyperstar as it is a much better fit than either the Xtreme or the Infinity..Also 1 cable is certainly an advantage here. The infinity has 2 cables and is a big block in front of the primary mirror. The Xtreme is either 2 cables plus a large receiver for wireless control or 3 cables for computer connection. I know many are of the opinion cabling in general is not a problem but for hyperstar it does matter.The asi224,6se,hyperstar combination will become the travel scope for dark sky sites but there is no facility for eyepiece.
So, that is why I am down the beach with the LX90,and Infinity and eyepieces.Have had 1 clear sky over the week. That was on Friday,wasn't dark till 1030, but I had to be up at 0530 Sat for the Lorne Pier to Pub swim....just cant get the timing right
Gidday David I have used the asi224 on hyperstar on the 6"sct twice but the results were better than the Xtreme or the Infinity on that setup .The asi224 is much less bulky with fewer cables than the other 2 and I think that will be the setup I will continue to use with hyperstar. Now that may be my inexperience. I am very comfortable with the Xtreme generally and was annoyed that I couldnt get anything reasonable on hyperstar. My focus at the moment is to get used to the Infinity on the lx90 . One thing at a time otherwise I just get confused.
The 6"sct ,hyperstar and asi224 will be a good combination Paul
I would add that decent 2" - 1.25" adaptors are needed to hold the camera securely and in alignment, OEM ones can be very poor, you don't want your camera on the floor!. Sometimes the whole focuser needs to be upgraded, so if you are looking at a secondhand scope with a focuser upgrade it may be better value.
Skywatcher Esprit 100ED, SW AZ EQ6-GT mount, Mallincam Extreme camera, Pinnacle Dazzle Video Creator Platinum, model DVC100.