Dithering using PHD2 and the latest APT

[leveye]

Suggestions for settings would be welcome for i still have had no luck with it. Using the latest version of APT and PHD. Meade DSI 1 mono CCD and a Canon 5Dmkiii. I get one maybe two good picture and then all hell breaks loose LOL. I start getting trails.

[Yoddha]

Hi Chris,

Could you try to lower the "Dithering Stability" value and to increase the "Settle Time"? Maybe APT starts the exposure too early?

[tonygl]

Activate RA dithering only in PHD2. This happens when PHD make dithering in DEC. My opinion is that is caused by the setting of DEC guiding North/South in PHD. When PHD makes dithering in same direction which is configured for DEC guiding it needs a lot of time to get the original position relative to occuracy of polar alignment. During this time there isn't a DEC guiding and trails occured. I have this issue many times. Problem is not in APT. Some time ago I had a conversation with Ivo (Yoddha) about APT - PHD communication. The decision for dithering direction is made in PHD. When PHD make +/- RA dithering it's OK but on 3rh or 4th picture when a DEC dithering is made fail occurs when match the fixed by you direction of guiding South/North.

[leveye]

Clear skies soon to test those settings Ivo and tonygl. Many thanks! Test results coming asap.

[leveye]

Tonygl thats exactly whats happening. I will try your suggestion for i feel thats the cure to this issue. Many thanks!