Stacking Effect -- single frame vs. 25 frames

Test GIF -- Time-Lapse from William Hill

06/03/2017 Kickoff Deep Crescent Nebula Project -- Ha First

Plan to collect total 12hr Ha (24 subs with 30min each)...
Will take 3 nights ... from 12am to 5am

Use SGP Pro autofocus... works great out of box...

Take 30 flat subs every morning...

06/03/2017 Clean Dob 10" Mirror

The mirror is very dirty... Let it clean ...

05/25/2017 Refocus is needed ...

Here is a photo I took at 11pm and 4am without doing re-focusing...
You can see it is off by a lot !

05/14/2017 More on my Front Yard Observatory

Give another try to image in my front yard. There are not many NB targets that I can access. NGC6888 is the only one at reasonable alt at 11pm...

But !! The street light is killing me !!!

It highlights all the dust on my lens, and maybe CCD filter...

Second night.. I have my son to deal with this problem with me... haha

A light shield works !!

My Picture on Takahashi USA Catalog ;-)

Haha...