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In This Week's Tele Vue Blog: Watch Your Back Focus

Astrophotography Accessories Equipment Filters Imaging Optics CCD CMOS DSLR
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#1 Stars4jon

Stars4jon

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Posted 23 September 2022 - 12:41 PM

Reducers, flatteners, reducer / flattener combos, and edge correctors all require a specific “back focus” distance between the imaging sensor and the adapter. Within that back focus distance is placed needed accessories such as a filter wheel / filter drawer, off-axis-guider (OAG), and perhaps an atmospheric dispersion corrector (ADC) for planetary work -- plus any required adapters to connect these together and to the scope and camera.

 

In this week’s blog, we investigate setting up the correct back focus using a popular brand of astro camera and our Imaging System accessories.

 

Read and share this blog using the shortened link: Watch Your Back Focus

 

MM_Heart-Nebula-JPG-NP101is-New-0.8x-Ha-Oiii-7-768x612.jpg

The Heart Nebula by Tele Vue engineer and Instagram user Mahendra Mahadeo. All rights reserved. Used by permission. “Located in the Constellation of Cassiopeia, the Heart Nebula is a very interesting summer target with bright areas of ionized hydrogen and dark dust lanes. This is my second time capturing this nebula but the first time I’ve done it with a monochrome Camera.” Tele Vue-NP101is APO refractor with prototype Tele Vue Imaging System 0.8x reducer / flattener, and Atik Horizon camera on Skywatcher EQ6-R Pro mount. Exposures through Astronomik 2″ filters: Hα 43x5min and OIII 47x5min for a total of 7.5-hrs.


Edited by Stars4jon, 23 September 2022 - 12:46 PM.

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#2 Phillip Creed

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Posted 27 September 2022 - 09:45 AM

Jon,

Noticed the words, "Tele Vue-NP101is APO refractor with prototype Tele Vue Imaging System 0.8x reducer / flattener."

Please elaborate.  I assume it'll work with a non-IS NP101, too?

Clear Skies,

Phil



#3 Stars4jon

Stars4jon

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Posted 28 September 2022 - 04:00 PM

Hi Phil,

 

Yes it will. 


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#4 phenrotay

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Posted 30 September 2022 - 06:10 AM

Hello,
And for the NP127 (original, non Is)?
Pierre


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