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EAA Equipment Additions

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#1 aeBry

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Posted 21 September 2021 - 12:06 PM

I've got my EAA base equipment - CPC800, ASI385, and laptop. I am enjoying my EAA journey immensely so far with his these items. What do I need to bring it to the next level?

Filters?
Wireless and portable power solutions (cords are drive me bonkers)?
What else?

Right now I'm exclusively doing my EAA sessions in my Bortle 7/8 backyard.

Thanks!

#2 alphatripleplus

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Posted 21 September 2021 - 12:18 PM

Are you using a focal reducer with your SCT? A f/6.3 SCT reducer is a useful addition. For combating LP, you can use narrowband filters on emission nebulae. I use a H-alpha filter with a mono camera on emission nebulae, while others use dual narrowband filters, like the Optolong L-eXtreme with one shot colour cameras such as yours. Be prepared for longer sub-exposures with narrow band filters.

 

For broadband targets, like galaxies, many of us don't use filters as there is some debate about how effective they can be under LP. Some people have found infrared pass filters to be helpful on broadband targets such as galaxies under heavy LP.


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#3 JTNX01DC

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Posted 21 September 2021 - 12:56 PM

I use a marine battery w/an inverter.


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#4 aeBry

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Posted 24 September 2021 - 01:35 PM

Thanks for the suggestions! I do have the FR, so that part is covered. Looks like a filter or 2 might be next on the list.

JTNX01DC, I have a battery box with an inverter, but no battery. Are you using SLA or some other battery technology like lithium? The sealed lead is quite heavy to lug around.

#5 Jeff Lee

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Posted 24 September 2021 - 02:41 PM

lithium (expensive in larger sizes) can run my scope, my laptop and heaters for over 6 hours. Have a small one on my SE and it runs for a couple of days.



#6 alphatripleplus

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Posted 24 September 2021 - 04:22 PM

Right now I'm exclusively doing my EAA sessions in my Bortle 7/8 backyard.

 

I don't mind using an extension cord in my back yard - quick to roll out and roll up, and easy to power multiple things. I can understand those that use a portable power supply if they are travelling, as I would but I tend not to use large batteries in my back yard.

 

I only run a  USB dew heater for a small scope from a small battery pack, and everything else from the extension cord.



#7 GazingOli

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Posted 25 September 2021 - 01:43 AM

What do I need to bring it to the next level?

I would invest in a camera with a bigger sensor. The ASI294, for me, was a step forward.

 

The wedge was also an improvement for me. No field rotation issues and the chance to do longer exposures if needed.

 

CS.Oli


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#8 MarMax

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Posted 25 September 2021 - 02:18 AM

I'm using the C11 (Alt-Az) with both reducers (f/6.3 and f/3.3) and enjoying that very much. The f/3.3 introduces a lot of CA but it's fun to use. You can see the CA in this pic of M57 but it does not really bother me for a 10 minute effort. My best ever measured SQM-L was 18.34 and it's usually 17.90's to 18.

 

gallery_332504_17333_52025.jpg

 

I like using a 12V 18Ah AGM battery ($39) to power the mounts. It's small enough to handle easily and depending on how much power I need it can last up to three nights (mount only). If I end up running the laptop and mount off the battery it will only last 3-4 hours.

 

I typically use an extension chord for the laptop. I've added a cooled camera that I've not run off the battery yet but the mount and camera should be good for 6-8 hours. If I need more capacity I'll pick up another 12V 18Ah battery and run them in parallel.

 

Keeping it simple I'd also suggest a portable table, comfy chair and a trackball mouse.


Edited by MarMax, 25 September 2021 - 10:56 AM.

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#9 alphatripleplus

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Posted 25 September 2021 - 08:15 AM

I've got my EAA base equipment - CPC800, ASI385, and laptop. I am enjoying my EAA journey immensely so far with his these items. What do I need to bring it to the next level?

 

I'm not sure how good the tracking of the CPC800 is in alt-az mode. You could try a wedge as Oli mentions, but that is quite a heavy load to set-up on a wedge if you need to set-up each night. If you have a small ED refractor that you can piggyback on your big SCT, you will be able to get somewhat wider fields with the shorter focal length and the same camera.

 

Also the cost of something like a AT72EDII is modest compared with the cost of adding a larger sensor camera.


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#10 GazingOli

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Posted 25 September 2021 - 01:17 PM

something like this will work very well:

20210109_213925resized2.jpg

 

but even my lightweight (4.4 lbs) selfmade triplet apo is too heavy to use with a CPC on wedge, as far as my experience goes.

 

CS.Oli


Edited by GazingOli, 25 September 2021 - 01:18 PM.

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#11 GazingOli

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Posted 25 September 2021 - 01:44 PM

here a very bad smartphone shot that might give you an idea about the issues with the piggypack refractor when using a wedge:

 

20210524_000552s.jpg

 

a lot more bending than without the wedge (I hope this is the right way to express it).

 

CS.Oli


Edited by GazingOli, 25 September 2021 - 01:47 PM.

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#12 iam1ru12

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Posted 26 September 2021 - 10:24 PM

I'm using the C11 (Alt-Az) with both reducers (f/6.3 and f/3.3) and enjoying that very much. The f/3.3 introduces a lot of CA but it's fun to use. You can see the CA in this pic of M57 but it does not really bother me for a 10 minute effort…

What brand/model of 0.33x focal reducer are you using?  Your camera has a 1/2 chip, right?

 

-Mike



#13 MarMax

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Posted 27 September 2021 - 02:08 AM

What brand/model of 0.33x focal reducer are you using?  Your camera has a 1/2 chip, right?

 

-Mike

It's the Meade f/3.3 reducer and the camera has a 7.86mm x 4.46mm sensor (9mm diagonal). The fully illuminated circle should be about 10mm and I've not noticed any vignetting with the 9mm sensor.




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