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Old 05-06-2021, 08:18 PM
TrevorW
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Bluehorse nebula

Tried capturing this one the other night with a QHY183c OSC attached to an 80ED with .8 reducer and Optolong L-pro filter 2hrs 50min of data in varying exposures between 150 and 300s but not happy with the data, even after stretching doesn't seem to show up the nebula that well. Any recommendations for capturing this one
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Old 10-06-2021, 09:33 PM
neurosis3000 (Reggie)
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Quote:
Originally Posted by TrevorW View Post
Tried capturing this one the other night with a QHY183c OSC attached to an 80ED with .8 reducer and Optolong L-pro filter 2hrs 50min of data in varying exposures between 150 and 300s but not happy with the data, even after stretching doesn't seem to show up the nebula that well. Any recommendations for capturing this one
Hi Trevor, I did this one recently and its very fsint. I used 600s subs on a ZWO 294MC OSC using an ES 80ED triplet with 0.8 reducer so 385mn f/4.8. I turned out OK.
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Old 11-06-2021, 08:21 AM
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The Optolong enhance L filter - is that a narrowband filter?

The Blue Horsehead is a reflection nebula and narrowband filters will not enhance it but just make it harder to detect.

Try no filter and longer exposures. If you are imaging from a suburban location it may not be a good target to try.

Best to stick to the brighter targets when in the suburbs.

Greg.
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Old 11-06-2021, 01:55 PM
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Retrograde (Pete)
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Quote:
Originally Posted by gregbradley View Post
The Optolong enhance L filter - is that a narrowband filter?
.
The OP said it's an L-Pro, Greg, which is more of a broadband LP filter & seems to have pretty good transmission in the blue so in theory it should allow it to be captured.

I think the main issue Trevor is that it's super faint AND extremely large.
My image here: Blue Horsehead was taken with a Samyang 135mm lens at f2.8 under really dark skies. I did crop it a little but the image is still 9 degrees across - getting background sky around the blue horse-head for contrast with even a small, fast f-ratio telescope (without resorting to mosaics) would likely take a camera with a pretty large sensor.

Hope that gives some context. It's definitely a challenging object.
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Old 11-06-2021, 07:49 PM
AdamJL
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More integration time
It's not the faintest of nebulas, but it's not bright either. Changing your exposures won't matter much, but you can capture more light by chucking on a reducer/flattener.

I'm hoping to shoot this tomorrow with a Canon 100mm Macro at either f.2.8 or f/4 so I'll report back if it's any easier.
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Old 12-06-2021, 09:27 AM
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As Greg pointed out it's easier in RGB rather than NB. And it's a faint one too.
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Old 14-06-2021, 12:34 PM
Wilsil (Wilco)
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Shoot at a dark site
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Old 14-06-2021, 01:42 PM
TrevorW
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Thanks all for the feedback
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