ASI1600v3 with dust on the sensor and OAG question

matariki

Hello,

I have 2 questions:

1) I just received my ASI 1600 from Robtics (NL) and noticed that there is sadly a big dust mote on the sensor...

See this image for the dust mote: https://i.imgur.com/8xnxXjZ.png

Is it safe to open the sensor chamber with the 4 screws on the outside of the body and blow off the dust with a hand blower?

2) I also bought the OAG and EFW (8x31mm) and wonder what is the correct order / way to connect everything to achieve 55mm backfocus. Is there a manual? The current manual only shows connection without OAG.

So far I have:

sensor (6.5mm) camera-front - directly screwed into FW (20mm) FW female T2 -- OAG screwed into (16.5mm) end of OAG is either male M42 or male M48 ...... (this is what is missing) ...... M48 male from reducer (55mm backfocus)

So I would need a ~10mm M48/M42 to M48 (both sides female), right? Anyone knows where to get one of these?

Regards,

Denis

archange34

http://www.webastro.net/forum/showthread.php?t=145042

https://forum.albe.club/viewtopic.php?f=25&t=1045

http://www.webastro.net/forum/showthread.php?t=144725&page=2

In french sorry.

Sam@ZWO

you can do like this in a clear room

but it may introduce more dusts if the air is not very clear

for connect with OAG, you can do like this

ASI-EFW- (t2-t2) -11mm T2 extender-OAG

6.5+20 + 2 + 11 +16.5 = 56mm