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Help flattening a ES 80mm carbon fiber

astrophotography refractor equipment
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#1 najarfermin

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Posted 07 September 2019 - 08:34 PM

Hello everyone. I'm looking for some one who has this kind of setup. I'm having troubles trying to flatten the scope, I have distortion in the corners.

Some friends told me that maybe I need 1 mm spacer for the back focus. Do you know where I can get them ? Some advice ?

My setup:

- Explore Scientific 80mm triplet Apo

- Canon T5i/T7i/t3i

- Explore Scientific 2" Field Flattener - FFEDAPO-01 (55 mm backfocus )

Thank you for help

 

 

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#2 droe

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Posted 07 September 2019 - 09:50 PM

I have found that the Orion reducers works well. I did a comparison in this post that you may find helpful.

 

 https://www.cloudyni...or-es-80mm-apo/

 


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#3 najarfermin

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Posted 11 September 2019 - 12:27 PM

Thanks !!



#4 FlankerOneTwo

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Posted 12 September 2019 - 08:42 AM

Just FYI, there are numerous reports of corner distortion issues with some of the ES flatteners that were not curable with tilt / spacing adjustment. I have two friends with the ES ED80 (which is a fine scope) that spun their wheels for weeks trying to fix the corners with the ES flattener. Both worked fine with my TSFLAT2 and with the Orion flattener.


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#5 Baskevo

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Posted 28 October 2019 - 03:13 AM

Just FYI, there are numerous reports of corner distortion issues with some of the ES flatteners that were not curable with tilt / spacing adjustment. I have two friends with the ES ED80 (which is a fine scope) that spun their wheels for weeks trying to fix the corners with the ES flattener. Both worked fine with my TSFLAT2 and with the Orion flattener.

 

Wow wish I saw this a month ago tongue2.gif I've been pulling my hair out trying to find answers for why my Field Flattener isn't flattening... I originally had a defective one that felt like a cheap knock-off version of the replacement I received after returning it, and the stars at least didn't look over blown and uncollimated, but I still couldn't get the field to flatten. I've the maximum amount of spacing I can possibly add, and there is no difference in my images. I just received my Orion Field Flattener... I'll let you know how it goes



#6 Baskevo

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Posted 28 October 2019 - 03:14 AM

Hello everyone. I'm looking for some one who has this kind of setup. I'm having troubles trying to flatten the scope, I have distortion in the corners.

Some friends told me that maybe I need 1 mm spacer for the back focus. Do you know where I can get them ? Some advice ?

My setup:

- Explore Scientific 80mm triplet Apo

- Canon T5i/T7i/t3i

- Explore Scientific 2" Field Flattener - FFEDAPO-01 (55 mm backfocus )

Thank you for help

So did you end up figuring this out najarfermin?



#7 Baskevo

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Posted 29 October 2019 - 02:36 AM

Sorry for spamming this post, but I wanted to share this...

 

This was 20mm of spacing added to the Field Flattener:

 

https://photos.app.g...CegDu8KhscbtBb6

 

It's still not perfect, but WAY better!


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#8 najarfermin

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Posted 22 November 2019 - 09:38 PM

Not spamming at all ! Thanks for sharing



#9 moonrider

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Posted 22 November 2019 - 11:30 PM

I guess I'm one of the lucky ones that got a good ES flattener. My only problem was getting the back focus dialed in. My ES 80 took 2, 2" focuser extensions and the required 50 to 55mm of spacers.



#10 SeattleScott

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Posted 23 November 2019 - 01:04 AM

Hello everyone. I'm looking for some one who has this kind of setup. I'm having troubles trying to flatten the scope,

An 18-wheeler should do the trick.

Scott
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#11 thedudeabidez88

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Posted 16 February 2020 - 05:00 PM

Sorry for spamming this post, but I wanted to share this...

This was 20mm of spacing added to the Field Flattener:

https://photos.app.g...CegDu8KhscbtBb6

It's still not perfect, but WAY better!



I've been having a hell of a time trying to get my ES 2" 55mm flattener working on my ES ED80 APO CF as well. Can't get my stars flattened no matter what I do. I've even collimated the focuser and lens cell. Just to be clear, is this 20mm beyond the 55mm requirement or just 20mm?

Edited by thedudeabidez88, 16 February 2020 - 05:01 PM.



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