7 replies to this topic

[GolgafrinchanB]

I had some fun today making little graphs comparing my perception of how cool various targets are both visually and under night vision. It's not scientific or even super serious, but I had a lot of fun and wanted to share them. I've also included the source doodle so you can make and share your own if you're interested.

 

Red is night vision

Blue is glass

I'm thinking of these through my 10" f/5 dob

 

Enjoy,

Mitchell

Attached Thumbnails

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Edited by GolgafrinchanB, 23 April 2025 - 12:13 AM.

[ABQJeff]

Fun! I would rate Rosette visual much higher, even at B4 it is amazing (in my 11”F/7 filling the FoV), but overall nice concept.

[Saros145]

I quite like the vertical axis of the graph.

[Thierry Legault]

yes, the planets and the Moon lost a lot of contrast and don't look nice, with two reservations about the gazeous planets:

 

- with a methane filter, Jupiter and Saturn look very unusual: the GRS is brighter than the rest of the atmosphere, and the globe of Saturn almost disappears

 

- more satellites are visible with NVD, in particular (depending on the aperture of the telescope) Ariel, Titania and Oberon with Uranus, and Triton with Neptune

[WheezyGod]

Haha I love this! Please do more of them!
Edit: I would say I mostly agree with your assessments.

Edited by WheezyGod, 26 April 2025 - 10:33 AM.

[petertinkerer]

These graphs are an excellent way to capture the  areas where night vision excels and where it makes little or no improvement.  I have poor skies and started using  a prime focus with 680nm filter, night vision device on one side of my 6 inch f5 binoscope so I could actually finish seeing all the Messier galaxies.  Nothing brings out the advantage of night vision more than looking through the glass side of the binoscope and seeing absolutely nothing and then looking through the night vision side and seeing the galaxy easily and clearly.

[GolgafrinchanB]

Haha I love this! Please do more of them!
Edit: I would say I mostly agree with your assessments.

Any specific requests of others? I stopped at 8 because the graphs kinda stopped getting unique, but I'm happy to submit requests if you have a target in mind. Also, if you have your own graphs to add, they are as easy to make as importing the doodle into Microsoft Paint (or your favorite photo "editing" tool - I used the default one on my phone) and drawing some lines

 

yes, the planets and the Moon lost a lot of contrast and don't look nice, with two reservations about the gazeous planets:

 

- with a methane filter, Jupiter and Saturn look very unusual: the GRS is brighter than the rest of the atmosphere, and the globe of Saturn almost disappears

 

- more satellites are visible with NVD, in particular (depending on the aperture of the telescope) Ariel, Titania and Oberon with Uranus, and Triton with Neptune

I haven't had access to a methane filter yet, but I hope to find an imager willing to let me borrow one some day. This sounds super fun to try! How do you view your planets without damaging the tube? Jupiter has left marks on my tube in the past (cleared up after a night of dark boxing), both at 1x and magnified. Even at a 1mm exit pupil Jupiter seems pretty bright to where I worry about it. I'm less worried with a methane filter since that would cut down on brightness.

[Joko]

Any specific requests of others? I stopped at 8 because the graphs kinda stopped getting unique, but I'm happy to submit requests if you have a target in mind. Also, if you have your own graphs to add, they are as easy to make as importing the doodle into Microsoft Paint (or your favorite photo "editing" tool - I used the default one on my phone) and drawing some lines

 

I haven't had access to a methane filter yet, but I hope to find an imager willing to let me borrow one some day. This sounds super fun to try! How do you view your planets without damaging the tube? Jupiter has left marks on my tube in the past (cleared up after a night of dark boxing), both at 1x and magnified. Even at a 1mm exit pupil Jupiter seems pretty bright to where I worry about it. I'm less worried with a methane filter since that would cut down on brightness.

You can also observe the Moon with Methane / UV filters.

And observe the Sun with your NV + Cak filter.

 

Like for the planets and natural satellites, these are great observations with NV.

As a NV vendor we can't share links done with our NVD but there are many discussions about all the objects observed.

Edited by Joko, 27 April 2025 - 03:43 AM.