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#7276 saguaro

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Posted 22 January 2019 - 01:43 PM

My question is how do you get SharpCap to be black? When I choose night colors, it's red, and and it dims the image at the same time. How you doing that?

SharpCap 3.2 has a night mode color scheme (press F12 to toggle it on and off). See https://www.sharpcap...in-sharpcap-3-2


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#7277 jdaliix

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Posted 23 January 2019 - 01:08 PM

SharpCap 3.2 has a night mode color scheme (press F12 to toggle it on and off). See https://www.sharpcap...in-sharpcap-3-2

Strange, mine doesn't do that. Like I said in my post, choosing night vision colors turns mine red. F12 does nothing, and choosing it in the settings turns it all red and dims the viewing window. And Update says I'm updated. I guess I'd better go post in the SharpCap forum.

 

Thanks for trying, though.



#7278 saguaro

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Posted 24 January 2019 - 01:05 AM

A brief EAA session tonight before moonrise. I used my 40-year old Celestron 8-inch SCT on an Evolution Alt-Az mount, with a Meade 3.3 focal reducer operating at F/4 with a ZWO 385MC camera (no filters) and SharpCap Pro 3.2 live stacking with a master dark.

 

Crab Nebula, 19x15sec

 

Crab nebula.jpg

 

NGC 2403, 24x15sec

 

NGC 2403.jpg


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#7279 saguaro

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Posted 24 January 2019 - 01:06 AM

Horsehead Nebula, 29x15sec

 

Horsehead.jpg


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#7280 saguaro

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Posted 24 January 2019 - 01:08 AM

M74, 26x15sec

 

M74.jpg


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#7281 wargrafix

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Posted 24 January 2019 - 12:21 PM

Are you autoguiding?

#7282 saguaro

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Posted 24 January 2019 - 01:11 PM

Are you autoguiding?

No, I’m using a Celestron Evolution Alt Az mount, no wedge.



#7283 curronh

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Posted 24 January 2019 - 02:12 PM

I have to say those are pretty amazing shots with a 40 year old 8" scope on an Alt Az mount... Well Done!


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#7284 saguaro

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Posted 24 January 2019 - 02:20 PM

I have to say those are pretty amazing shots with a 40 year old 8" scope on an Alt Az mount... Well Done!

Thanks! This is the setup that I take to outreach events since it’s very portable.



#7285 tmaestro

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Posted 25 January 2019 - 11:20 AM

I notice that in all of those, whether it's nebula or galaxy, your histogram tweaks are about the same.  You bring the black point up to just before the peak of the white curve, the mid point to the place where the yellow curve crosses the color graphs, and the white point stays all the way out to the right.  Is this intentional or coincidental?  

 

I see that you're under Bortle 4 skies, do you use any filters?


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#7286 wargrafix

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Posted 25 January 2019 - 11:22 AM

Bortle 4 wins...hard!


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#7287 wargrafix

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Posted 25 January 2019 - 11:23 AM

I notice that in all of those, whether it's nebula or galaxy, your histogram tweaks are about the same.  You bring the black point up to just before the peak of the white curve, the mid point to the place where the yellow curve crosses the color graphs, and the white point stays all the way out to the right.  Is this intentional or coincidental?  

 

I see that you're under Bortle 4 skies, do you use any filters?

As far as I know...you never mess with the white point



#7288 jdaliix

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Posted 25 January 2019 - 04:10 PM

I notice that in all of those, whether it's nebula or galaxy, your histogram tweaks are about the same.  You bring the black point up to just before the peak of the white curve, the mid point to the place where the yellow curve crosses the color graphs, and the white point stays all the way out to the right.  Is this intentional or coincidental?  

 

I see that you're under Bortle 4 skies, do you use any filters?

In my experience, you mess with all of them until your view is what you want it to be. 



#7289 saguaro

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Posted 25 January 2019 - 04:37 PM

I notice that in all of those, whether it's nebula or galaxy, your histogram tweaks are about the same.  You bring the black point up to just before the peak of the white curve, the mid point to the place where the yellow curve crosses the color graphs, and the white point stays all the way out to the right.  Is this intentional or coincidental?  

 

I see that you're under Bortle 4 skies, do you use any filters?

Yes, all my histogram adjustments are intentional! However, I don't really focus on looking at the histogram. Instead, while adjusting the Black and Mid points, I focus on trying to get a live-stacked image that pleases me. smile.gif  I typically put the white point all the way to the right, since that gives me the best results, and only adjust the Black and Mid points.

 

Under my Bortle 4 skies, I do use filters, typically an IDAS D1 or Astronomik CLS (not the CCD version). However, I decided to try not using a filter for these just to see how they would turn out.


Edited by saguaro, 25 January 2019 - 04:38 PM.

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#7290 saguaro

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Posted 27 January 2019 - 09:45 AM

An enjoyable observing session last night under my Bortle 4 skies west of Tucson. Again I used my 40-yr old Celestron 8-inch SCT on an Evolution Alt-Az mount (no guiding, no wedge). Camera used was ASI 385MC operating at F/4 using a Meade 3.3 focal reducer. This time I used an Astronomik CLS filter, so I used Gain 350 to keep the subexposures to 15 seconds. SharpCap Pro 3.2 live stacking with master dark and saved as viewed (only reduced in size and converted to JPG for posting here).

 

I didn't notice much difference with using the CLS filter under my skies (at least, not enough to matter for outreach events), so if skies are dark enough, I won't use the filter.

 

IC 342 15secx27 Gain 350, 8-inch SCT@F/4, Evolution Alt-Az mount, 385MC camera with CLS filter

 

ic-342-15secx27-cls-small.jpg

 

 

M81, 15x20sec, Gain 350, 8-inch SCT@F/4, Evolution Alt-Az mount, 385MC camera with CLS filter

 

M81-15secx20-350-Gain-CLS-f.jpg


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#7291 saguaro

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Posted 27 January 2019 - 09:47 AM

M78 15secx23 Gain 350, 8-inch SCT@F/4, Evolution Alt-Az mount, 385MC camera with CLS filter

 

M78-15secx23-cls-small.jpg


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#7292 saguaro

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Posted 27 January 2019 - 09:48 AM

NGC 891 15secx20 Gain 350, 8-inch SCT@F/4, Evolution Alt-Az mount, 385MC camera with CLS filter

 

NGC-891-15secx20-CLS-small.jpg


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#7293 selfo

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Posted 27 January 2019 - 10:31 AM

Very nice shots Sagauro

The .33 Focal reducer does not seem to cause any vignetting with your C8 and your 385.  Wish I could find one of those puppies to use on my own rig as 0.63 just isn't enough on the larger objects

 

Stewart


Edited by selfo, 27 January 2019 - 10:32 AM.

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#7294 Ptarmigan

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Posted 27 January 2019 - 11:56 AM

Nice images Saguaro! cool.gif waytogo.gif like-button.jpg

 

I just got an IMX385 camera as well, which is an Altair GPCAM. cool.gif


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#7295 saguaro

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Posted 27 January 2019 - 03:02 PM

Very nice shots Sagauro

The .33 Focal reducer does not seem to cause any vignetting with your C8 and your 385.  Wish I could find one of those puppies to use on my own rig as 0.63 just isn't enough on the larger objects

 

Stewart

Thanks Stewart. The Meade 3.3 are still available used. I put a wanted ad on CN and Astromart and was able to find one pretty quickly.



#7296 saguaro

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Posted 27 January 2019 - 03:03 PM

Nice images Saguaro! cool.gif waytogo.gif like-button.jpg

 

I just got an IMX385 camera as well, which is an Altair GPCAM. cool.gif

Thanks. You will really enjoy this camera! There is some amp glow but it can be calibrated out by using a matching master dark during live stacking.


Edited by saguaro, 27 January 2019 - 05:06 PM.

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#7297 Ptarmigan

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Posted 27 January 2019 - 03:55 PM

Thanks. You will really enjoy this camera! There is some amp glow but it can be calibrated out by using a matching master dark during lie stacking.

I tested it, but not on the telescope and can set the analog gain to 10,000. Most use around 200 to 500.



#7298 neaptide

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Posted 27 January 2019 - 06:14 PM

Very nice shots Sagauro

The .33 Focal reducer does not seem to cause any vignetting with your C8 and your 385.  Wish I could find one of those puppies to use on my own rig as 0.63 just isn't enough on the larger objects

 

Stewart

 

I was able to get my C8 down to F/3.7 by stacking focal reducers. I used the .63 SCT reducer and a 2” 0.5x reducer screwed onto the end of a 2” nosepiece with ~10mm spacer to the camera. The 2” accessories reduced the vignetting and with this configuration I had almost zero vignetting. It worked really well with my asi224 camera. You may have to adjust the spacing a bit for the asi385. Others have had success stacking two 0.63 reducers. 


Edited by neaptide, 27 January 2019 - 06:48 PM.

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#7299 Stargazer3236

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Posted 28 January 2019 - 09:31 AM

An enjoyable observing session last night under my Bortle 4 skies west of Tucson. Again I used my 40-yr old Celestron 8-inch SCT on an Evolution Alt-Az mount (no guiding, no wedge). Camera used was ASI 385MC operating at F/4 using a Meade 3.3 focal reducer. This time I used an Astronomik CLS filter, so I used Gain 350 to keep the subexposures to 15 seconds. SharpCap Pro 3.2 live stacking with master dark and saved as viewed (only reduced in size and converted to JPG for posting here).

 

I didn't notice much difference with using the CLS filter under my skies (at least, not enough to matter for outreach events), so if skies are dark enough, I won't use the filter.

 

IC 342 15secx27 Gain 350, 8-inch SCT@F/4, Evolution Alt-Az mount, 385MC camera with CLS filter

 

attachicon.gif ic-342-15secx27-cls-small.jpg

 

 

M81, 15x20sec, Gain 350, 8-inch SCT@F/4, Evolution Alt-Az mount, 385MC camera with CLS filter

 

attachicon.gif M81-15secx20-350-Gain-CLS-f.jpg

Use an IR/UV block filter to reduce the star bloat. Works very well!



#7300 Stargazer3236

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Posted 28 January 2019 - 09:35 AM

It is kind of funny. Amateurs say you can double stack two F/.63 reducers atop one another to achieve F/3.7 Focal ratio. I tried that a few times, it produces a lot of vignetting on the outer 1/4 of the FOV. I only use that when I want magnified images at F/3.7 with my Nexstar C8. I also can get  F/3.78 with my AT60ED, native F/6, using one Meade F/.63 focal reducer on my little APO refractor and it produces a nice 4.4 degree x 3.84 degree FOV.


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