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M42, M43 & Running Man (Stacked Film)

astrophotography dso Meade catadioptric


Alen Koebel

M42, M43 & Running Man (Stacked Film)

This is a full-frame image on 35mm slide film. It is a stack of three exposures: 5 minutes, 15 minutes and 20 minutes. All were taken through a Hutech IDAS LPS filter, which made it a bit of a challenge to get any of the original blue back in the image. It's still far too red, even given the film I used. According to most thinking, stacking isn't supposed to work as well for scanned film images as it does for images that are taken with digital sensors (film is by no means a linear-responding recording medium). But it quite obviously is still very effective at controlling noise, in this case film grain. In fact, I didn't need to apply any noise reduction at all and instead added a bit of sharpening to bring out details in the nebulae. North is up in this view.

_Imager: Olympus OM-1 + Hutech IDAS LPS filter (original model), Elite Chrome 200 35mm slide film pushed one stop, scanned at 4,032 x 2,688 (10.8 MP). _Scope: Meade LXD55 6-inch f/5 Schmidt-Newtonian on Vixen GP-DX with SkySensor 2000PC. _Exposures: Three @ 5min, 15min, 20min. _Guider: Manually guided using 80mm f/5 guidescope. _Date: September 4, 2005. _Location: Near Ayton, Ontario, Canada.

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