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1.25" or 2" for EAA

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#1 sjed

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Posted 10 August 2018 - 11:03 AM

I am starting to gather equipment to try EAA. Presently my setup is 1.25" but I have a 6" f/4.8 mak newt on Equitorial mount that can handle 1.25" or 2" viewing. I did purchase a ZWO camera. My question is do I just continue with my 1.25" setup for EAA or is there a big advantage to switching to 2" for EAA and would I see an appreciable difference in viewing?



#2 petert913

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Posted 10 August 2018 - 11:09 AM

I'm thinking the CMOS sensors are pretty small.  Unless you have a 4/3rds or larger sensor,  2" probably won't buy you anything.

I could be wrong.  It's been known to happen :)


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#3 barbarosa

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Posted 10 August 2018 - 11:26 AM

If you look at the 294 Pro page on the ZWO site toward the bottom there is a diagram of various ways to connect the camera. One of them shows it with 1.25"/M42 adapter and a 1.25" filter. I connect my 294 (4/3 sensor) and 224 (1/3 sensor) using T extensions and the 1.25" adapter  without any issues that I can see. ZWO recommends using this set up with the 1600. 

 

The site does not show the use of a 1.25" filter with the larger 23.6mm  aps-c camera such as the ASI071 Pro.



#4 sjed

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Posted 10 August 2018 - 03:59 PM

I have a zwo 290mc with the smaller sensor so if I understand you correctly, you don't see much of a difference until you get to bigger sensors?



#5 LaCasaCorp

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Posted 10 August 2018 - 10:56 PM

You will not see any difference, with that sensor size, don't worry! 



#6 barbarosa

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Posted 10 August 2018 - 11:48 PM

Agreed no difference whatsoever



#7 jgraham

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Posted 11 August 2018 - 10:21 AM

The smaller sensors work fine with 1.25" hardware. Even my ASI294MC Pro with its type 4/3 chip only shows a little bit of vignetting in the corners at f/3.6 using a 1.25" nosepiece and focuser. When using an APS-c chip I switch to 2" hardware.



#8 sjed

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Posted 12 August 2018 - 10:48 AM

Thanks everyone.




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