Best camera for use with OAG?

ASI's Range of Specialised CMOS camera's

Moderator: Sam

Post Reply
mcgillca
Posts: 68
Joined: Tue Feb 21, 2017 8:45 am

Best camera for use with OAG?

Post by mcgillca » Fri Mar 03, 2017 1:17 pm

Hi - I have Williams Optics Star 71 which has a focal length of 350mm and a 1600MC for my imaging camera.

I'm considering either the ASI120MM-S or the ASI178MM as a guider to use with the ZWO OAG.

With the 178MM, I'd have double the real estate (about a square degree vs 0.5 square degree for the 120MM) so increasing the chance of finding a good guide star, but at the expense of a little more weight, and from the photos, looks like the 178 is a little longer ,and of course the additional cost.

Any advice?

Thank you,

Colin

tgmorris99
Posts: 12
Joined: Sat Feb 06, 2016 1:37 am

Re: Best camera for use with OAG?

Post by tgmorris99 » Sat Mar 04, 2017 3:18 pm

I too have a WO Star71 + ASI1600MC-C and just purchased the ZWO OAG. I already had an ASI224MC so that's what I'll be using for guiding.

A word of caution though. I attached the OAG to the Star71 using the native M48 thread on the Star71. It seemed to attach fine but when going through the motions of getting everything focused I discovered that the depth of the M48 thread on the Star71 is too long for the OAG and it bottomed out against the stalk of the prism. No damage but it did mean that I had to switch to the M42 plate on the OAG and use an M48-M42 reducer on the Star71.

I could have also used a spacer ring on the Star71 to change the depth but since my other use is on an AT130EDT and the FR/FF has an M42 connection it's OK using the M42 adapter plate.

rockstarbill
Posts: 21
Joined: Fri Aug 12, 2016 6:49 pm

Re: Best camera for use with OAG?

Post by rockstarbill » Sun Mar 05, 2017 3:50 am

mcgillca wrote:Hi - I have Williams Optics Star 71 which has a focal length of 350mm and a 1600MC for my imaging camera.

I'm considering either the ASI120MM-S or the ASI178MM as a guider to use with the ZWO OAG.

With the 178MM, I'd have double the real estate (about a square degree vs 0.5 square degree for the 120MM) so increasing the chance of finding a good guide star, but at the expense of a little more weight, and from the photos, looks like the 178 is a little longer ,and of course the additional cost.

Any advice?

Thank you,

Colin
The ASI120MM is a staple guide cam. Tested, tried, proven, and very reliable. Its footprint is very small (smaller than the SSAG from Orion) and the sensor picks up tons of stars.

mcgillca
Posts: 68
Joined: Tue Feb 21, 2017 8:45 am

Re: Best camera for use with OAG?

Post by mcgillca » Mon Mar 06, 2017 12:01 pm

rockstarbill wrote:
The ASI120MM is a staple guide cam. Tested, tried, proven, and very reliable. Its footprint is very small (smaller than the SSAG from Orion) and the sensor picks up tons of stars.
That's very good advice - thank you!

I'll go with the smaller guide camera.

Colin

mcgillca
Posts: 68
Joined: Tue Feb 21, 2017 8:45 am

Re: Best camera for use with OAG?

Post by mcgillca » Mon Mar 06, 2017 12:03 pm

tgmorris99 wrote:I too have a WO Star71 + ASI1600MC-C and just purchased the ZWO OAG. I already had an ASI224MC so that's what I'll be using for guiding.

A word of caution though. I attached the OAG to the Star71 using the native M48 thread on the Star71. It seemed to attach fine but when going through the motions of getting everything focused I discovered that the depth of the M48 thread on the Star71 is too long for the OAG and it bottomed out against the stalk of the prism. No damage but it did mean that I had to switch to the M42 plate on the OAG and use an M48-M42 reducer on the Star71.

I could have also used a spacer ring on the Star71 to change the depth but since my other use is on an AT130EDT and the FR/FF has an M42 connection it's OK using the M42 adapter plate.
That's great to know - I have a 5mm M48 extension - I'll check the thread length when the OAG arrives.

Thank you,

Colin

Post Reply