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ES ED102 2.5 HEX FOCUSER ADAPTOR

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#1 NOVA8264

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Posted 20 January 2021 - 01:34 PM

Is this the correct adaptor to use on the ES ed102 hex focuser to be able to connect a flattener. Also, when calculating 55mm back focus on this scope for a ZWO  camera, with or without the flattene, is that calculated with focuser drawn all the way in?

https://explorescien...ter-for-2-5-hex



#2 NoDarkSkies

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Posted 21 January 2021 - 09:38 PM

I got mine as well and even Pre-Ordered the Explore Scientific M48x0.75 Adapter for FFFR ES Link

What flattener are you getting for your 102?
My focuser is at about 10 using my ZWO ASI Camera, I do not have a flattener for my 102.
I do have the Explore Scientific 3" Field Flattener .7x Focal Reducer - FFFR507X-00 for my ES 127 & ES 140.


Edited by NoDarkSkies, 21 January 2021 - 09:44 PM.


#3 kvastronomer

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Posted 21 January 2021 - 10:41 PM

When you don't use flattener or reducer you don't care about back focus. You add as many extensions (and retract focuser) as you need to achieve focused image.

 

For my ES ED102 I use this flattener: Hotech 2" SCA Self-Centering Field Flattener with removed nose piece, so I can thread it instead of sliding it.

And this adapter to thread flattener into: https://starizona.co...55e1c2fc8&_ss=r

 

With combination above mine looks like this (55mm backfocus):

Focuser retracted about 20mm --> two 2.5"" extension tubes (comes with the scope) --> Starizona Adapter --> Hotech flattener (threaded without nose piece) --> Zwo ASI (16.5mm ext + 21mm + 17.5mm) --> Zwo camera

 

And I screw filter into starizona adapter (side pointing OTA)

 

Hope it helps



#4 NoDarkSkies

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Posted 21 January 2021 - 10:44 PM

This one? Hotech 2" SCA Self-Centering Field Flattener

What size is the T-Thread?

On the Apex ED Threaded Focuser Adapter do you have to have this to mount a ZWO M42 or M48 Camera?

*Please note the threaded adapters take up backfocus. The M42 Threaded Adapter takes up 4mm from your backfocus, while the M48 adapter takes up 1mm of your backfocus.

I wonder how well this would work with a Full Frame Camera as well as an APS-C Camera?


Edited by NoDarkSkies, 21 January 2021 - 10:56 PM.


#5 kvastronomer

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Posted 21 January 2021 - 10:57 PM

From Starizona I ordered adapter for ES with M48. When I removed nose piece from the flattener (you found correct one) it was M48 as well, so they connect nicely.

Starizona adapter takes back focus only in case when you put it in between flattener and camera. In my example it is not the case: adapter -> flattener -> 55mm extensions -> Camera



#6 NoDarkSkies

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Posted 21 January 2021 - 11:03 PM

adapter -> flattener -> 55mm extensions -> Camera

Telescope + adapter -> flattener -> 55mm extensions -> Camera

or ES Telescope -> flattener -> 55mm extensions -> Camera?



#7 kvastronomer

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Posted 21 January 2021 - 11:03 PM

From Starizona I ordered adapter for ES with M48. When I removed nose piece from the flattener (you found correct one) it was M48 as well, so they connect nicely.

Starizona adapter takes back focus only in case when you put it in between flattener and camera. In my example it is not the case: adapter -> flattener -> 55mm extensions -> Camera

I also own Starizona Apex ED 0.65x Reducer / Flattener.

In this case flattener is threaded into the same starizona adapter from OTA side and it looks like this:

Focuser retracted about 5mm --> two 2.5"" extension tubes (comes with the scope and starizona flattener is hidden now inside these two extensions) --> Starizona Adapter (eating 1mm) --> Zwo ASI (16.5mm ext + 21mm + 17.5mm) --> Zwo camera

 

And total backfocus is 56mm now as per starizona specification.


Edited by kvastronomer, 21 January 2021 - 11:04 PM.


#8 kvastronomer

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Posted 21 January 2021 - 11:12 PM

adapter -> flattener -> 55mm extensions -> Camera

Telescope + adapter -> flattener -> 55mm extensions -> Camera

or ES Telescope -> flattener -> 55mm extensions -> Camera?


es102.JPG


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#9 NOVA8264

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Posted 22 January 2021 - 01:45 PM

I got mine as well and even Pre-Ordered the Explore Scientific M48x0.75 Adapter for FFFR ES Link

What flattener are you getting for your 102?
My focuser is at about 10 using my ZWO ASI Camera, I do not have a flattener for my 102.
I do have the Explore Scientific 3" Field Flattener .7x Focal Reducer - FFFR507X-00 for my ES 127 & ES 140.

No FF or FR yet, was trying to make sure I have the adaptor for the focus tube to attatch a FF to first.



#10 NOVA8264

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Posted 22 January 2021 - 01:48 PM

So are the centering rings on the flattener still on or do they unscrew off and you then screwed the rest of the flattener onto the adaptor?



#11 kvastronomer

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Posted 22 January 2021 - 02:19 PM

So are the centering rings on the flattener still on or do they unscrew off and you then screwed the rest of the flattener onto the adaptor?

The centering rings are unscrewed off but it was not easy as they used glue on that thread.




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