Sh 2-234 Initial Test of C11 Edge ZWO 6200M Combination (Effect on SNR) (Jerry Yesavage)

Sh 2-234 Initial Test of C11 Edge ZWO 6200M Combination (Effect on SNR)

Revision title: HDRMT Applied

First Light on a New Scope:

There were at number of considerations at getting a C11 Edge, most importantly Gary Imm could tell me exactly what to do, but I was very interested to see what combining the 2800mm FL would do with binning the huge sensor of the ZWO ASI 6200M 4x4. I am happy with the result.... after two months of tweaks.

The math is here:

https://kevinrfrancis.com/2020/12/binning-in-astrophotography-to-bin-or-not-to-bin/

Basically 2x2 binning of a CMOS sensor doubles the SNR ratio (A CCD quadruples it). However, using sum of squares math I believe you get a quadrupling of the SNR when you bin 4x4.

In any case, I think the image looks pretty crisp for first light.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Other Images getting up to speed on the system:

First Image (G):

Test after new Focus V curve and re-calibration of guiding.

Binned 4x for large sensor.

No Flats or Bias yet.

Ran uncooled at about 0 C. Hence a lot of hot pixels.

Second Image (H):

14x450s H-alpha with Bias and Flats. cooled to -5C now.

Third Image (I):

BlurXterminator applied to H.

Fourth & Fifth Images (I&J):

GHS and the HDRMT applied

Final image is N with 22 subs.

E

Title: Initial Colimation

Uploaded: ...

F

Title: Final Columation

Description: Dark strip is painters masking tape to identify correct screw to turn... from center to outside edge.

Uploaded: ...

H

Title: More Subs, Bias and Flats

Uploaded: ...

I

Title: BlurXterminator and GHS Applied

Uploaded: ...

J

Title: HDRMT Applied

Uploaded: ...

K

Title: Tilt

Description: Tilt in the J Revision with a good number of stars. Need to confirm in NINA.

Uploaded: ...

L

Description: Colorized.

Uploaded: ...

M

Title: Focus V-Curve and Blacklash

Description: Finally, a reasonable V-curve.
Binning=2
Blacklash in upper left reduced with setting pf 250 steps
Wide CFZ = f**2 * 2.2 grossly = 220 microns

Uploaded: ...

N

Description: Now up to 22 subs after the rain stopped.

Uploaded: ...

O

Title: Redid Periodic Error Model

Description: To help guiding.

Uploaded: ...

P

Title: Field Flattening

Description: Just to complete technical details the field is pretty flat. ZWO tilt plat screwed in tight (No adjustments of tile). OTA flat out of the box.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	7321469
PixInsight job	DE1H67UPACE5BGZORAYP6DXMRMY66I9N
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h28m12s.65
RA (top/left)	05h29m22s.14
RA (top/right)	05h29m21s.47
RA (bottom/right)	05h27m02s.60
RA (bottom/left)	05h27m04s.54

Dec (center)	+34°26′13″.5
Dec (top/left)	+34°04′46″.8
Dec (top/right)	+34°47′49″.9
Dec (bottom/right)	+34°47′39″.4
Dec (bottom/left)	+34°04′33″.9

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