7 replies to this topic

[james7ca]

The Veil Nebula taken with a 105mm focal length Nikkor AI-S lens at approximately f/4 (using step-down/up rings, limiting aperture 26 to 30mm step-up ring) and a ZWO ASI178MM-Cool camera all carried unguided on an A-P Mach1GTO mount. Four hours and twenty-four minutes (88 x 3m) for both H-alpha (red) and OIII (blue) combined to produce a bi-color image with a mix of both Ha and OIII for the green channel.

 

Image processing in PixInsight and Photoshop CC2017.

 

Shown here reduced (1600 x 1064 pixels) and compressed to meet the CN posting guidelines.

 

If I get a chance I want to go back and capture this with a 200mm lens and the ASI183MM camera which should give me about the same field of view but at a higher resolution (and with about 20 mega pixels, rather than the 6 mega pixels that I captured with the ASI178 camera).

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Edited by james7ca, 27 September 2018 - 06:10 AM.

[Makelo215]

Looks great!

[james7ca]

Makelo215, thanks for the notice.

I think this is a pretty good example of what can be done with a small and cheap camera lens and a high resolution camera like the IMX178 or IMX183.

Edited by james7ca, 27 September 2018 - 09:05 PM.

[Greatdanes]

Very nice image!

[james7ca]

Greatdanes, thanks.

[szg]

I feel disco!

[fetoma]

James, great image. What size filters did you use?

[james7ca]

szg and fetoma, thanks for the notice.

 

I used mounted 1.25" filters held in a filter drawer that sits between the lens and the camera. Below is an image of a similar setup (using a different camera). Also, here is a thread on this topic (mounting filters behind the lens):

 

  https://www.cloudyni...r/#entry8422614

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