M13 Hercule's great globular cluster / Pentax K5 mod + Tamron 500mm mirror lens / SW star adventurer / 400 ISO (patrick cartou)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: HD150293 · HD150679 · HD150998 · Hercules Globular Cluster · IC 4617 · M 13 · NGC 6205 · NGC 6207

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M13 Hercule's great globular cluster / Pentax K5 mod + Tamron 500mm mirror lens / SW star adventurer / 400 ISO

Powered byPixInsight

M13 Hercule's great globular cluster / Pentax K5 mod + Tamron 500mm mirror lens / SW star adventurer / 400 ISO

Last year I tried to shoot this same famous globular cluster with the same setup + teleconverter x 1,4.see (2021-05-29). link to image of 2021-05-29
Last night I've chosen the same target, but without the teleconverter. Of course this old catadioptric lens (Tamron 500mm f/8.0) doesn't give more than its capacity (particularly coma on big stars). However the result seems to be better...?

Nearly 3 hours integration time (177 x 60") ISO 400

siril 1.0.3 stacking no drizzle (for the 1st version)

B

Description: Less realistic image, like an artist's view...

Uploaded: ...

C

Description: New stacking drizzle x 2 . Image cropped

Uploaded: ...

D

Description: New cropped image with reduced stars

Uploaded: ...

E

Description: New version, with deconvolution, and a bit more colorful...

Uploaded: ...

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AAA : Astronomes et Astrographes Amateurs

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Status	Advanced success
Started	...
Astrometry.net job	5992016
PixInsight job	I7ZHN705IRH8G1RBFMDUF5GPQ9G4L8DO
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h41m40s.94
RA (top/left)	16h38m05s.48
RA (top/right)	16h38m08s.88
RA (bottom/right)	16h45m10s.74
RA (bottom/left)	16h45m17s.50

Dec (center)	+36°27′50″.1
Dec (top/left)	+37°20′54″.4
Dec (top/right)	+35°34′50″.0
Dec (bottom/right)	+35°34′36″.6
Dec (bottom/left)	+37°20′36″.6

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M13 Hercule's great globular cluster / Pentax K5 mod + Tamron 500mm mirror lens / SW star adventurer / 400 ISO

M13 Hercule's great globular cluster / Pentax K5 mod + Tamron 500mm mirror lens / SW star adventurer / 400 ISO

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M13 Hercule's great globular cluster / Pentax K5 mod + Tamron 500mm mirror lens / SW star adventurer / 400 ISO

M13 Hercule's great globular cluster / Pentax K5 mod + Tamron 500mm mirror lens / SW star adventurer / 400 ISO

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