dithering phd2 /apt distance

[velaproxima]

hi guys and girls 

really needing some help with my dither disatance..and im wondering if someone could work this out for me

my main cam is .canon 6d m2

5.67 microns

w 35 x h 24

so image scale should be 0.866

scope is 1370mm

 

guide cam meade lpi  gc

3.75microns

w 4.8 x 3.6 

scope 162mm

so image scale should be 4.775 

 

just need a hand with what i should set the scale in apt and phd2 . not really a maths nerd so please just put it in plane english ..i dont need some hawking equation .. thanks for any help..

 

 

[david_taurus83]

Set it at 1 in APT and 2 in PHD. That will get you a roughly 10 pixel or so dither on your 6D.

Edit: It'd not really clear what the 1 to 5 scale is in APT. I've always left it at 1 and used the PHD scale which is the number of pixels on the guide camera to dither. So 2 pixels on your guide camera is almost 10 arc seconds of movement.

Edited June 24, 2021 by david_taurus83