Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5457  ·  NGC 5473  ·  NGC 5474  ·  NGC 5485
M101 - Fast exposures with Samyang 135, Ben
M101 - Fast exposures with Samyang 135
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M101 - Fast exposures with Samyang 135

M101 - Fast exposures with Samyang 135, Ben
M101 - Fast exposures with Samyang 135
Powered byPixInsight

M101 - Fast exposures with Samyang 135

Equipment

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Description

I wanted to try the fast exposures approach.

- gain 300 / offset 140 to get the min read noise

- 5 seconds sub. 75 % of the best subs have been kept (stacked with DeepSkyStacker).

Image C shows one 5'' sub with background extraction and stretched.

- despite of heavy light pollution i used the UV-IR cut instead of the CLS because i wanted the maximum possible light. Lens opened at f/2.

- no guiding

- less polluted location + cooling the camera would improve the SNR that is weak

- the result can be compared to B : 30'' subs, gain 76 (but with CLS and flats for this one)

- Now stack in PI and reprocessed

Comments

Revisions

  • M101 - Fast exposures with Samyang 135, Ben
    Original
  • Final
    M101 - Fast exposures with Samyang 135, Ben
    D

D

Description: Drizzle, reprocessed

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M101 - Fast exposures with Samyang 135, Ben

In these public groups

Samyang 135 f/2