M13 unlikely image / Pentax K5 serial+Tamron 500mm SC f/8+teleconv x 1,4 / SW star adv / 80 ISO (patrick cartou)

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

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M13 unlikely image / Pentax K5 serial+Tamron 500mm SC f/8+teleconv x 1,4 / SW star adv / 80 ISO

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M13 unlikely image / Pentax K5 serial+Tamron 500mm SC f/8+teleconv x 1,4 / SW star adv / 80 ISO

I wanted to try again my second-hand purchase Pentax K5 serial, this time with a great challenge: with an old mirror lens Tamron 500mm f/8.0 and a Tamron teleconverter x 1,4 equivalent 700mm focal lenght ! And all that setting up the 80 ISO sensibility to reach the high dynamic range of K5.

48 x 300" lights but 38 really kept (= 4 hours) for the vesions A, B, C, and D

Only the 18 best subs for E version.

SIRIL 0.99.8 no drizzle.

Few adjustments, cropping on the cluster to avoid too much stars coma.

B

Description: SIRIL 0.99.8 stacking drizzle x 2

Cosmetic correction for stars coma with GIMP (roundstars)

Uploaded: ...

C

Description: A new crop with details renforcement

Uploaded: ...

D

Description: Stars reduction and red color reduction

Uploaded: ...

E

Description: Following advices of Michael Sherick, stacking 18 best sub.
Cosmetic enhancement too

Uploaded: ...

F

Description: Extreme cropping and star reduction

Uploaded: ...

G

Description: New treatment with Snapseed

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	4627637
PixInsight job	BYSF0T1BW5HDUT5SMN5C4N5OBKYYVOBO
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	16h41m41s.923
RA (top/left)	16h40m32s.539
RA (top/right)	16h40m35s.466
RA (bottom/right)	16h42m50s.729
RA (bottom/left)	16h42m48s.711

Dec (center)	+36°28′00″.20
Dec (top/left)	+36°41′24″.48
Dec (top/right)	+36°14′07″.15
Dec (bottom/right)	+36°14′36″.81
Dec (bottom/left)	+36°41′54″.50

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M13 unlikely image / Pentax K5 serial+Tamron 500mm SC f/8+teleconv x 1,4 / SW star adv / 80 ISO

M13 unlikely image / Pentax K5 serial+Tamron 500mm SC f/8+teleconv x 1,4 / SW star adv / 80 ISO

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M13 unlikely image / Pentax K5 serial+Tamron 500mm SC f/8+teleconv x 1,4 / SW star adv / 80 ISO

M13 unlikely image / Pentax K5 serial+Tamron 500mm SC f/8+teleconv x 1,4 / SW star adv / 80 ISO

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G

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