I lost count of my scopes. Now I just want mobility. I came, I saw, I bought some interesting accessories, and put names to faces: NEAF 2012, ASAE 2012, SWAP 2013, ASAE 2013.
Quote:Hi,I am looking for some advice about my EQ6 mount. It is the basic model, without GoTo and without PEC. It lets me doing astrophotography taking short exposures with short focal lengths.Recently I took several shots to M42 and after stacking without movement correction I got a picture of the periodic error of my EQ6 mount.After measuring the distance between peaks and valleys I found it yields 40 arcseconds of periodic error, and it takes 6 minutes to complete this distance from peak to valley.Just wanted to know if that values are what you should expect from an EQ6 mount or if they are much worse. I would also want to know about alternatives to this mount with better periodic error values and similar price. Thanks for any help or tips you could offer me.
Uncle Rod Uncle Rod's Astroblog: http://uncle-rods.blogspot.com/
Astrophoto: Intes Micro ALTER-M606 (6" f/6 MCT), Astrotech AT6RC (6" f/9 RC), 2x Tair-3 lenses (300mm f/4.5)
Visual: Celestron 8 SCT ('77 Orange Tube, 8" f/10), Selsi #247 Refractor (aka Towa #339, 80mm f/15), Tasco 11TE-5 Newtonian (4.5" f/7.9), Galileoscope (50mm f/10)
Mounts: Celestron CI-700, iOptron ZEQ25GT, Celestron CG5-ASGT, plus a couple old EQ2s My Astrophotography Site: http://ap.x-wing.ca/
Quote:I could be way off-base on this as I have not used an EQ6, but since your PE fluctuations are in RA and seems to be over a very short time period it has me wondering... How do you balance your scope?I know from my own lowly CG-5 and from a few other reports on the forums here that if the mount is balanced EXACTLY perfectly or if it is balanced slightly west heavy then what can happen is the RA axis gears, rather then meshing continuously/smoothly, can be bumped ahead slightly and then sits waiting for the motor to catch up, where it then gets bumped slightly again, etc. That would created a sawtooth pattern something like yours with size of up to as much as the backlash in RA.You might try balancing slightly East heavy to keep the gears continuously meshed/pushing and see if that changes anything.