Observation by Ray Emery: NGC 7000 red only

Uploaded by

Ray Emery

Observer

Ray Emery

Observed

2019 Oct 27 - 18:59

Uploaded

2019 Oct 28 - 19:05

Objects

The North America Nebula (NGC7000)

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Constellation

Cygnus

Field centre

RA: 20^h58^m
Dec: +44°23'
Position angle: +0°09'

Field size

1°42' × 2°33'

Equipment

Canon 700D modified
Wratten 25 red filter
Genesis 500mm f5 refractor

Exposure

8 x 10 mins & 5 x 15 mins exps @ ISO 1600

Location

Brinkhill, Lincs

Target name

NGC 7000 North America Nebula

Title

NGC 7000 red only

About this image

Humble stuff I'm afraid.

I bought an el cheapo Chinese (Wratten no. 25) 2-inch red filter.

The streaky stars in the lower part of the frame, esp. towards the lower right, are due to the cheap filter, I am almost sure.

The idea was to try to get improved images of h-alpha objects without shelling out for a very expensive h-alpha filter!

Now, I am aware that a DSLR is not the instrument of choice here, since I am only using 1/4 of the elements per pixel.

This image has of course been knurdled up in Photoshop on the machine.

No slings & arrows, please - it was just an experiment.

But I think the result ain’t too bad, and may be worth pursuing.

Quite a bit of flare around the brighter stars - I noticed this on Live View when focussing. May also be down to the filter?

No challenging moonlight of course - which is where a proper h-alpha filter would definitely score.

Files associated with this observation

NGC 7000_PS2_sm 2.jpg (1.9 MB)

Like this image

Graham Winstanley, Jeremy Shears, David Swan, Andy Wilson, Geof Lewis, Andrew Dumbleton, Ray Emery

Comments

David Swan, 2019 Oct 30 - 17:20 UTC

I think this is really good, Ray. I was just looking at the transmission curve of the Wratten 25: it is a pretty steep cutoff lambda < 600nm. You've inspired me to have a go with my Hyperstar, with a 1.25" red filter just above the chip (I don't have a 2" one). I seem to recall my Baader red longpass actually cuts off more.....

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