focal point of the asi1600mm cooled and skywatcher 80ed with a reducer

[Wirral man]

Hi does anyone have this setup and know the correct distance needed i have the skywatcher 80ed with the dedicated skywatcher focal reducer .85 along with the zwo efw and asi1600mm cooled thanks

[knobby]

Should work with a DSLR with no fiddling, so 10mm for T ring + 45mm standard DSLR flange to chip = 55 mm ... ish !

The ZWO EFW is 20mm, The 1600 is 6.5 mm to chip so in theory you need to add about 28.5mm spacer to equate to a DSLR.

'in theory'

[vlaiv]

Yes, as knobby mentioned, you need to account for 55mm of optical path.

6.5mm is T2 to sensor distance on ASI1600, and if EFW is 20mm, then you have about 28.5mm. You will need T2 to M48 adapter and I recommend you to use some sort of variable extension that will put you in 26-30mm range so you can "dial" in correct spacing by trial and error.

[david_taurus83]

You should speak to them first to confirm the spacing you need.

 

 

https://www.firstlightoptics.com/adapters/baader-varilock-29-lockable-t-2-extension-tube.html

[Wirral man]

right will do that thanks