Posted 30 June 2013 - 05:43 AM
I had a SBIG ST7 but I sold it a while ago ( to a forum member ) because I wanted to do something else in astronomy. I have done some other observing but now it seems that the variable disease is back on me. I think it's in the blood.
Because SBIG is no option for me ( it's to expensive to buy a new one or a used one ) I'm looking for a other camera. The other commercial available camera's are almost AGB. I have read in the past that one can do good photometry with a AGB camera as long I don't go above the linearity.
So, which brand is good choice?
Posted 30 June 2013 - 10:49 AM
I have used both the Meade DSI Pro I and Pro II for photometry and they worked just fine. As you have already mentioned, just keep them in the linear range and all is well.
Posted 30 June 2013 - 11:34 AM
what is your setup? How faint can you go with it?
With my ST7 and C8 I could reach mag 13 and had very good counts with exposuretimes of about 2 - 3 minutes. Most of the time I did unfiltered exposures of High amplitude stars.
Posted 30 June 2013 - 03:36 PM
Posted 01 July 2013 - 07:35 AM
Back when I used the DSIs, my setup was the same as John's-- a Meade SN6. Its been a few years so I don't remember exactly how deep I could go. I was not able to get 60-second images, though-- because of the mount, I stacked several shorter exposures which may have totaled 60 seconds (I don't remember).
I have recently acquired an ST7, but have not yet used it for photometry-- I mostly do single-channel photometry with an Optec photometer these days.
Posted 03 July 2013 - 01:49 PM
I'm going to buy a SBIG ST-402ME. It's the same as the ST7 I used to have expect the autoguiderhead. That's no problem because I can use a extern autoguiding system. I also think that one of the advantages of the ST-402ME is that I can buy a intern filterwheel with photometric filters (BVI).
My question now is: what is the best system to autoguide?
Standalone or a guidecamera connected to a laptop?
Pro's and con's?
Posted 03 July 2013 - 09:22 PM
Posted 04 July 2013 - 02:09 AM
I use a C9.25 which gives no big FOV but it's also usable because I always go after stars between magnitude 10 and 15.
What do you mean with the WO 66 very solidly mounted? How do you do search for a guidestar with no rings?
Posted 04 July 2013 - 01:47 PM
The little WO66 is clamped down on a rail, adjusted to "kind of" point in the same direction as the scope. The FOV is wide enough that I have not failed to fine a guide star yet. Note the "yet."
Posted 04 July 2013 - 02:24 PM
Posted 04 July 2013 - 03:24 PM
Posted 05 July 2013 - 01:29 AM
Posted 05 July 2013 - 05:57 PM
Posted 06 July 2013 - 04:33 AM
Hi Hubert: Yes, I use PhD so I can pick any star in the FOV for guiding, no need to have the guide star in the center of the FOV.
Looks easier than using intern guiding. There was centering the guidestar a difficult
Posted 07 July 2013 - 11:10 AM
Posted 08 July 2013 - 01:08 AM
Posted 08 July 2013 - 01:19 AM
Posted 08 July 2013 - 03:16 PM
Posted 14 July 2013 - 04:32 AM
I have some doubts. Or I buy the NAGB with a small fov or I buy a AGB with a bigger fov.
Someone have comments on this?
Posted 14 July 2013 - 09:53 PM
Posted 15 July 2013 - 08:47 AM
And I always can sell my C9.25 and buy a 10" newton f4 which gives me a bigger FOV.
Posted 16 July 2013 - 12:12 PM
But, nothing wrong with larger FOV and ABG cameras so long as you figure linearity and stay linear.