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Contains:  NGC 1763, NGC 1966, NGC 2018, NGC 2048, NGC 2070, NGC 2077, Tarantula nebula, The star βMen, The star δDor, The star εDor, The star θDor, The star μMen
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LMC remix, 


            Wei-Hao Wang
LMC remix
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LMC remix

Technical card

Imaging telescopes or lenses:Sigma 180mm/F2.8 APOTakahashi TOA 150

Imaging cameras:Nikon D810ACanon EOS 5D Mark II MOD

Mounts:iOptron CEM60-ECTakahashi EM-400 Temma2

Guiding telescope or lens:Vixen FL70S

Guiding camera:Fishcamp Starfish

Focal reducer:Takahashi TOA 67 Flattener

Software:Photoshop CC

Filters:H alphaUV/IR-cut

Dates:Dec. 15, 2012May 4, 2016


Integration: 3.9 hours

Avg. Moon age: 14.66 days

Avg. Moon phase: 7.35%

Basic astrometry details job: 3258604

RA center: 5h 20' 57"

DEC center: -68° 51' 54"

Pixel scale: 4.617 arcsec/pixel

Orientation: 0.234 degrees

Field radius: 5.478 degrees

Resolution: 5300x6700

Locations: Alice Springs, Alice Springs, Northern Territory, Australia; Coonabarabran, Coonabarabran, Australia

Data source: Traveller


This is combined from the following two older images of mine:

The first image was taken with a 15cm telescope and has very high resolution. On the other hand, it is not very deep and there are all kinds of processing artifacts because it is a complicated mosaic. On the contrary, the second image was taken with a 180mm telephoto lens and is a single shot. It does not suffer from processing artifacts and it is very deep. It contains H-alpha data as well. However, its resolution is not very good. It's just a 180mm telephoto after all.

The image here is not a simple blending of the two. I took the high-frequency components from the high-resolution image and low-frequency components from the deep image, and then merged them, so I can have the best from the each side. This works pretty well for the frame center, but not quite so for the corners where the stars from the 180mm lens are not as sharp as the center. So additional steps were used to suppress the funky stars in the 180mm image. Unfortunately, the result is not perfect. There might be smarter ways to blend these two images, but I don't think it can be much better than this, given that the resolution of the two images are so different.

This is just for me to kill some time during bad weather. Eventually I will redo the mosaic with the 15cm telescope, to go much deeper and to process with my latest improved mosacking workflow. Hope you enjoy watching this image.



Wei-Hao Wang
License: None (All rights reserved)

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LMC remix, 


            Wei-Hao Wang