alanv12952@... writes: Because it is drastically so low to begin with. What mount are you coming from? If you want to reduce periodic error just for the fun of it, then by all means do so.

teche70@... writes: That will depend on how well drift aligned that you are. You can get the periodic error down around 1 arc sec, so if you have less than 1 arc sec drift in both axes for X

"Not necessary unless you want to do unguided imaging" How long could you go, unguided, with the Mach1 mount...under 800mm FL.? Todd calibration at I have not periodic drastically crops up

Will the StarGPS-NX work with an 600E GOTO? What cable should I use (a Meade)? Thanks, Chris Spratt Victoria, BC

I've been calibration/guiding in Maxim at 0.5x since I was concerned about what the minimum move time for the mount would be when doing small corrections at the (relatively) high speed of 1x. Running

Roland, Thank you for the guidance. I will attempt to view the ST-4 calibration at next opportunity. Another question: should i run a 'PEM' routine before the above? I have not yet done

The manual says that the error curve from the factory testing procedures is already loaded into the the servo system. Is this active upon arrival, or not? Thanks, Alan Astrophotography:

Hi everyone, I am looking to upgrae my current Celestron CGE mount to a new or used AP mount. I currently use a CF C11 along with assorted accessories so the weight is close to 50#'s but no

winfij@... writes: Minimum move is around 8 milliseconds, which means this: 8msec = .008 sec. 1x = 15 arc sec per sec. Therefore 8 miliseconds at 1x = .008x15 = 0.12 arc

alanv12952@... writes: Not necessary unless you want to do unguided imaging. PEM is for periodic error compensation. That means during any unguided imaging, you can drastically reduce the

alanv12952@... writes: No, it is in memory, just as if you had placed your own curve into the memory (PEM = Periodic Error Memory). Use the keypad to turn it on or off. You can also use

Sorry for this 'supposed' Private eMail, sometimes my ISP doesn't see that I removed the originating source of the eMail and use the new address I typed in. Grrr...joe :( "May You Go Among The

alanv12952@... writes: You MUST calibrate at 1x, otherwise you may not get good cal numbers. With the ST4 guider, you are working basically blind, so it won't be easy for you to figure out

We get a lot of DSLR and CCD posts, but there still are some who shoot film. Actually, it averages out to be about as busy as this list. That's the reason I left APML. I still occasonally visit to

Hey Joe, --- Joe Mize <jmize@...> wrote: We get a lot of DSLR and CCD posts, but there still are some who shoot film. Actually, it averages out to be about as busy as this list. I've asked that

There's still a few of us left on APML, not many though. I think the total number is...7. Alan, APML must be Snooz Time. It sure was fun during the film era. documentation and use It works. OK. So,

Hey Joe, --- "jmize@..." <jmize@...> wrote: There's still a few of us left on APML, not many though. I think the total number is...7. OK. So, I should use 1x to calibrate AND guide.

Alan, you are an ol' warhorse, still using an ST-4 and film!!! Talk about being a rarity, I wonder how many out there are still film based. Looks like you're heading in the right direction, check

Hey all, Still getting familiar with the new 1200 which arrived in late Oct. Had a few opportunites (weather has sucked since mid-Sept) to use the FS-102 for a few comet shots and managed to do the

Hi Jean-Yves, If you have the short, large diameter shaft, then yes, you can add the shaft extension. See: http://www.astro-physics.com/products/accessories&#92; /mounting_acc/cwshaftoptions.htm You