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Observation by Dean Ashton: M101trying the Optolong L-Pro filter wit...

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Dean Ashton


Dean Ashton


2020 Mar 25 - 20:30


2020 Mar 29 - 21:24



Planetarium overlay


Ursa Major

Field centre

RA: 14h03m
Dec: +54°21'
Position angle: -2°55'

Field size

0°36' × 0°27'

  • Celestron 9.25 EdgeHD
  • 0.7xFocal Reducer
  • Celestron Nightscape 10100 CCD OSC
  • Optolong L-Pro Filter
  • CGEM mount

75x600s @/f7


St Austell, Cornwall UK

Target name



M101trying the Optolong L-Pro filter with a OSC camera.

About this image

This image of M101 was captured over the four nights of 15th, 23rd, 24th and 25th March 2020.  

A total of 75x600-second light frames were captured.  The Nightscape 10100 TEC was set at -10C. An Optolong L-Pro filter was used.  The L-Pro filter is a luminous filter that blocks typical light pollution wavelengths and provides an IR cut-off.

Image capture was controlled with SGP-Pro software.

Image calibration, integration and processing carried out with PixInsight.

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