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APS-C sensor and Full frame sensor on C11 ( edge hd )

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#1 cosmic07

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Posted 18 January 2025 - 10:33 PM

Hello everyone,

I’m exploring astrophotography camera and would like to understand the performance differences between the ZWO ASI 2600 MC Pro  and a full-frame camera when paired with the Celestron Edge HD 11 telescope.

 

Specifically, I’m interested in how these cameras perform in terms of edge illumination and vignetting under different configurations.

At Native Focal Length (f/10): How well does the Edge HD 11 illuminate the edges of both the ASI 2600 MC Pro and a full-frame sensor? Are there noticeable differences in vignetting or image quality between the two?

With a 0.7x Reducer: Does using the focal reducer significantly improve edge illumination for either sensor size? How does the field of view and vignetting compare between the APS-C and full-frame sensors in this configuration?

With Hyperstar V4: For those who have used Hyperstar V4, how does it perform with both APS-C and full-frame sensors? Is there any significant vignetting with full-frame cameras, or does Hyperstar fully illuminate both sensors?

Are there any specific calibration techniques or accessories that help optimize performance for either sensor size?

I’d love to hear your experiences, insights, or tips about these setups, especially if you’ve used both APS-C and full-frame cameras with the Edge HD 11. If you are willing to share unprocessed photos taken with either of these sensors using the Edge HD 11, that would be greatly appreciated! It would help me better understand the practical differences in image quality.



#2 speedster

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Posted 18 January 2025 - 11:32 PM

This is a C11 with Starizona LF reducer and APS-C sensor (ASI071MC PRO).  Stacked, but no further processing.

 

Screenshot 2025-01-18 222931.png


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#3 DuncanM

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Posted 19 January 2025 - 01:06 PM

Hello everyone,

I’m exploring astrophotography camera and would like to understand the performance differences between the ZWO ASI 2600 MC Pro  and a full-frame camera when paired with the Celestron Edge HD 11 telescope.

 

Specifically, I’m interested in how these cameras perform in terms of edge illumination and vignetting under different configurations.

At Native Focal Length (f/10): How well does the Edge HD 11 illuminate the edges of both the ASI 2600 MC Pro and a full-frame sensor? Are there noticeable differences in vignetting or image quality between the two?

With a 0.7x Reducer: Does using the focal reducer significantly improve edge illumination for either sensor size? How does the field of view and vignetting compare between the APS-C and full-frame sensors in this configuration?

With Hyperstar V4: For those who have used Hyperstar V4, how does it perform with both APS-C and full-frame sensors? Is there any significant vignetting with full-frame cameras, or does Hyperstar fully illuminate both sensors?

Are there any specific calibration techniques or accessories that help optimize performance for either sensor size?

I’d love to hear your experiences, insights, or tips about these setups, especially if you’ve used both APS-C and full-frame cameras with the Edge HD 11. If you are willing to share unprocessed photos taken with either of these sensors using the Edge HD 11, that would be greatly appreciated! It would help me better understand the practical differences in image quality.

This White Paper from Celestron gives a lot of technical details and describes Edge11/.7x Edge reducer performance:

 

https://s3.amazonaws...paper_final.pdf

 

 

The Edge 11+ .7x Edge SCT FR will provide excellent illumination for an APSC sensor and adequate illumination for a FF (24x36mm) sensor; flat frames will be mandatory. 



#4 Ron (Lubbock)

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Posted 20 January 2025 - 09:34 PM

I used the 0.7x reducer (and EdgeHD 1100) for years with a small (16 mm diagonal) sensor with no optical issues.  However, I encountered problems that I could not fix when I tried using the 0.7x reducer with an APS-C sensor.  So did several other people on CN.  The issue was chromatic aberrations on the edge of the field of view.  (I'd link the CN thread if I could find it.)  I have seen some imagers on Astrobin who got it to work, but let's say that the Celestron 0.7x reducer quality is suspect, and any flaws it may have become a lot more apparent once the sensor gets larger.


Edited by Ron (Lubbock), 21 January 2025 - 09:09 PM.

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#5 cosmic07

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Posted 21 January 2025 - 06:29 PM

I used the 0.7x reducer for years with a small (16 mm diagonal) sensor with no optical issues.  However, I encountered problems that I could not fix when I tried using the 0.7x reducer with an APS-C sensor.  So did several other people on CN.  The issue was chromatic aberrations on the edge of the field of view.  (I'd link the CN thread if I could find it.)  I have seen some imagers on Astrobin who got it to work, but let's say that the Celestron 0.7x reducer quality is suspect, and any flaws it may have become a lot more apparent once the sensor gets larger.

I had issues with the 0.7x reducer while using my Edge HD 11 telescope. I couldn't achieve focus with it, so I contacted High Point Scientific for assistance. After a thorough examination of my back focus through email correspondence, the technical team concluded that the problem might stem from a short focusing rod in the Edge HD 11.
To resolve this, I sent both my telescope and the reducer to Celestron for repairs, requesting a larger focusing rod. It appears that the issue was nearly resolved when I first tested it last year; however, I did not have the opportunity to test it with a camera due to other commitments. I am now waiting for spring to put my scope back to work again


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