NGC2244 Heart of Rosette NGC2237 NGC2238 NGC2246 (Chen Wu)

Celestial hemisphere: Northern · Constellation: Monoceros (Mon) · Contains: NGC 2239 · NGC 2244 · Rosette nebula · The star 12Mon

NGC2244 Heart of Rosette NGC2237 NGC2238 NGC2246, Chen Wu

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NGC2244 Heart of Rosette NGC2237 NGC2238 NGC2246

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NGC2244 Heart of Rosette NGC2237 NGC2238 NGC2246

I upgraded to EdgeHD in Jan 2019 as the coma issue on the normal C8 becomes more and more annoying. The choice of the right focuser is tricky as EdgeHD can lock the primary mirror to avoid mirror shift and fix the back focus. The traditional MicroTouch I have been using on C8 is great but it couldn't work with a locked primary mirror.

I loaned the OPTEC TCF-S focuser - a crayford style - from my friend. It works great when the reducer is not attached, for which the back focus is 133mm. This helps me to get the picture with an exact focal length of 2032mm. If the reducer is attached, then the recommended back focus (105mm) cannot be observed no matter how.

The focuser would be perfect, had it not used screws to tighten to the focuser drawtube. After a few nights of continuous shooting, the prolonged focus points indicate certain degree of sagging. I remember one night I caught the focuser in the air when I just started to dissemble it.

I would still consider the focuser, if I had a C11 or C14 EdgeHD. The back focus wouldn't be an issue.

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

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NGC2244 Heart of Rosette NGC2237 NGC2238 NGC2246

NGC2244 Heart of Rosette NGC2237 NGC2238 NGC2246

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NGC2244 Heart of Rosette NGC2237 NGC2238 NGC2246

NGC2244 Heart of Rosette NGC2237 NGC2238 NGC2246

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