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Getting My EAA Rig Back Together

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#1 Rustler46

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Posted 24 January 2021 - 08:47 PM

Recently I have downsized my OTA from C-11 to C-8, with a goal of easier setup and teardown. The C-11 will go into semi-retirement for a while, with my old 1985-era Celestron Super C8 Plus taking over largest aperture duties. But with a nice AT115EDT APO and EAA rig riding piggyback, there will be options, depending on my focus for a particular night's observing. 

 

Here is a recent shot of my workbench with the optical assembly in for servicing.

 

Screen Shot 2021-01-24 at 5.26.16 PM.png

 

The Pyramid 5-amp power supply (lower left, used with my G-11 mount) is being tested for output voltage under load. For this I used a small inverter powering an AC LED light seen in lower right. The C-8 has refractor tube rings and EAA rig riding on top.

 

Screen Shot 2021-01-24 at 5.27.24 PM.png

 

So here is the ZWO ASI290MC camera with 1972-era Mamiya-Sekor 55mm f/1.4 lens. Full frame that fast lens gives atrocious star images in corners. But at f/2.8 it has proved to be excellent corner to corner. With the camera's tiny sensor it should give nice images in its 5.8° x 3.3° FOV. This will cover the entire Veil Nebula as well as such expanses as from the Orion Nebula to Horsehead & Flame Nebulas. And f/2.8 will give bright images. Also the short 55 mm focal length places minimal demands on tracking. 

 

I just renewed my SharpCap Pro license for another 14 months. So now I need a clear night. The next 10 days is predicated to be non-stop rain & snow in the PNW. So I'll need to exercise patience.

 

Russ


Edited by Rustler46, 24 January 2021 - 09:48 PM.

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#2 Borodog

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Posted 24 January 2021 - 10:10 PM

Very nice indeed. I’ve been going back and forth about how to upgrade my cheapo EAA rig, which currently uses a C-mount zoom lens on a planetary camera piggybacking on my C8. I think I’ve settled on going with a camera lens; I just need to find one that is (a) fast, (b) produces nice star shapes and © doesn’t break the bank.

 

But the other option is a guide scope, something like the 120 mm mini guide scopes from ZWO, SVBONY, or WO. It’s twice the focal length of my current lens at it’s zoomiest and ~ f/4, but I could always use a reducer. I already have a reducer, and the f/4 mini guide scope from SVBONY is only $53. For that cheap I think it might be worth a shot. For that matter, I have a 240mm f/4 guide scope on my Dobsonian. I could test that out for EAA before pulling the trigger on a new lens.

 

Sorry; didn’t mean to hijack your thread. Your setup just got me thinking out loud.



#3 alphatripleplus

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Posted 25 January 2021 - 09:54 AM

 

 

I just renewed my SharpCap Pro license for another 14 months. So now I need a clear night. The next 10 days is predicated to be non-stop rain & snow in the PNW. So I'll need to exercise patience.

 

Russ

Russ, Just curious on how you did a 14 month SharpCap renewal ? I thought they were only for 12 months, as Robin stopped doing the longer term ( 5 yr) renewals



#4 Rustler46

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Posted 25 January 2021 - 11:15 AM

Russ, Just curious on how you did a 14 month SharpCap renewal ? I thought they were only for 12 months, as Robin stopped doing the longer term ( 5 yr) renewals

They have special going on where if you renew before the previous license expires, he adds two months to the regular 1 year license. I got a  notice that mine would expire on Feb. 20, 2021. For around $14, the new license expires April 20, 2022. Such a deal. 


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#5 alphatripleplus

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Posted 25 January 2021 - 12:07 PM

Thanks, Russ. I need to pay attention to that, as my license will expire in a few months.




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