Cygnus Loop Backpack
Designed and sold by ShinyPhoto
$61.61
$61.61
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Product features
- Carry your stuff, express yourself, keep your hands free, it's win-win-win
- Bag measures 17.7 x 11.8 x 4.9in / 45 x 30 x 12.5 cm
- Most standard laptops fit in the internal laptop pocket, which measures 13.5" x 10.5" / 34 x 27 cm
- Durable 100% polyester shell
- Vivid all-over design, sublimation printed for you when you order
- External mesh pocket and adjustable padded straps
- For a different style, check out the Drawstring Bag
- For more space, try the Duffle Bag
- Since every item is made just for you by your local third-party fulfiller, there may be slight variances in the product received
Cygnus Loop
Around 725pc (2400ly) distant, the Cygnus Loop (aka Sharpless Sh2-103) is an emission nebula in Cygnus measuring nearly 3° across, a large supernova remnant caused by a star around 12-15 solar masses (as yet unidentified).
I've had it in mind to make a photo of this entire loop for some months. This was comparatively tricky - with the appalling weather this summer, I decided OSC was the way to shoot it and preferably all in one frame without relying on a mosaic. Accordingly, I rigged-up a new astro-camera (the RisingCam IMX571 OSC) to my old Sigma 100-400mm (EF-mount) lens.
I also upgraded my dual-narrowband filter from the Optolong L-eNhance (which passes H-beta, making it not pure dual-NB) to the IDAS NBZ (which is pure Ha & OIII only, with no flare on bright stars).
It's been fun watching this come together. Initial attempts using 180s subs proved too dark, so I abandoned them and spent a couple of hours each of several nights shooting 300s subs instead.
Finally, in processing, experiments with background neutralization revealed far more nebula tendrils than I'd expected. I'd been looking for a coat-hook/screw shape with the bulk of the Eastern and Western Veil nebulae including the Witch's Broom nebula on the right, along with a "tail" toward the botom, but was not prepared to find an extra halo of Ha in an arc around the top of the structure.
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