Celestial hemisphere:  Northern  ·  Constellation: Hercules (Her)  ·  Contains:  Hercules Globular Cluster  ·  IC 4613  ·  IC 4614  ·  IC 4615  ·  IC 4616  ·  IC 4617  ·  M 13  ·  NGC 6196  ·  NGC 6197  ·  NGC 6205  ·  NGC 6207
M 13 Hercules Cluster (0.5mm T-2 distance ring test), star-watcher.ch
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M 13 Hercules Cluster (0.5mm T-2 distance ring test)

M 13 Hercules Cluster (0.5mm T-2 distance ring test), star-watcher.ch
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M 13 Hercules Cluster (0.5mm T-2 distance ring test)

Equipment

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Acquisition details

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Description

For this test I used a T-2 fine adjustment ring (0.5mm) to extend slightly the distance between DSLR sensor and corrector (measured distance about 54mm without any ring). The stars in the corners look much better than before, but there is still room for improvement. Next time I'll use the 1mm distance ring!

Additional I encountered for the first time some light reflections. I’m not sure about the source. There is no bright star outside the field of view in that direction… I’m a bit confused about this…

Maybe it’s time to darken the tube inside...

Comments

Revisions

  • M 13 Hercules Cluster (0.5mm T-2 distance ring test), star-watcher.ch
    Original
  • M 13 Hercules Cluster (0.5mm T-2 distance ring test), star-watcher.ch
    B
  • Final
    M 13 Hercules Cluster (0.5mm T-2 distance ring test), star-watcher.ch
    C

B

Description: Tried to remove the reflection

Uploaded: ...

C

Description: NoiseXTerminator

Uploaded: ...

Sky plot

Sky plot

Histogram

M 13 Hercules Cluster (0.5mm T-2 distance ring test), star-watcher.ch

In these collections

Star Cluster