M44 Field Flattening Exercise3: How to micro-manage the ASI 6200 Tilt Plate with Feeler Gauges (Jerry Yesavage)

Celestial hemisphere: Northern · Constellation: Cancer (Cnc) · Contains: 38 Cnc · 39 Cnc · 40 Cnc · 41 eps Cnc · 42 Cnc · Beehive · Beehive cluster · Cancer · IC 2388 · IC 2390 · M 44 · NGC 2624 · NGC 2625 · NGC 2632 · NGC 2637 · NGC 2643 · NGC 2647 · Praesepe · Praesepe Cluster

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M44 Field Flattening Exercise3: How to micro-manage the ASI 6200 Tilt Plate with Feeler Gauges

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M44 Field Flattening Exercise3: How to micro-manage the ASI 6200 Tilt Plate with Feeler Gauges

Target chosen to get a good star field for corrections. Image still not what I had with a Tak 180ED but I think I see how to get there.

"B" is a close up of the tilt plate with a 0.4 mm feeler gauge inserted between two of the sets of push-pull screws.

Point is that there is a gap of 0.4mm and the critical focus zone (CFZ) is about 0.1mm for this scope. Very easy to get lost in this gap. Using the gauges allows precise adjustment. Spacers that come with the scope for its image train are 1.0mm at smallest (10X CFZ). Secondary market spacers go down to 0.4mm and do not measure that by calipers.

This image is with the ASI/Stellarvue backfocus at 94.0 mm.

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B

B

Title: Tilt Plate Details

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Status	Advanced success
Started	...
Astrometry.net job	5610029
PixInsight job	8DMGU6AASV5MXOZOH6CX0C2YTN5WMZFI
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	08h39m57s.930
RA (top/left)	08h35m25s.251
RA (top/right)	08h44m33s.690
RA (bottom/right)	08h44m33s.344
RA (bottom/left)	08h35m20s.696

Dec (center)	+19°40′12″.47
Dec (top/left)	+18°56′28″.51
Dec (top/right)	+18°57′13″.58
Dec (bottom/right)	+20°23′30″.44
Dec (bottom/left)	+20°22′44″.61

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M44 Field Flattening Exercise3: How to micro-manage the ASI 6200 Tilt Plate with Feeler Gauges

M44 Field Flattening Exercise3: How to micro-manage the ASI 6200 Tilt Plate with Feeler Gauges

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M44 Field Flattening Exercise3: How to micro-manage the ASI 6200 Tilt Plate with Feeler Gauges

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