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Motion blur with Celestron piggyback mount?(!)

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#1 UP4014Fan

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Posted 28 May 2024 - 12:12 AM

OK, on the advice of the good folks here, I’ve purchased a dew shield and a piggyback camera mount for my NexStar 8SE. I should have purchased the dew shield some time ago. Right now, I’m again imaging M101 as kind of a control to see how things improve. I can say that the debayered images seem to have more contrast, so that’s good.

Now to the real conundrum: I added a piggyback mount to the scope. Using an identical SL2 and a relatively short lens (55mm), I got motion blur that looked like I was trying to hand hold a picture of a city street at night. Meantime, the images from the camera on the scope were rock solid. Any thoughts?

#2 B 26354

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Posted 28 May 2024 - 12:52 AM

Loose attachment of camera to mount?   shrug.gif

 

Which piggyback mount? How about a photo or three of your piggyback setup?


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#3 archiebald

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Posted 28 May 2024 - 12:52 AM

I think it would be helpful to any commenters if you could post a photo of your current setup.



#4 UP4014Fan

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Posted 28 May 2024 - 01:38 AM

Celestron’s mount that goes on the mirror cell.

 

It’s a poor photo, but you get the idea.  
 

 

Edit:  tried to attach photo from cell phone, but software isn’t having it…


Edited by UP4014Fan, 28 May 2024 - 01:44 AM.


#5 archiebald

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Posted 28 May 2024 - 01:42 AM

No photo showing



#6 B 26354

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Posted 28 May 2024 - 01:43 AM

Well so far... it's an invisible photo.  sad.png


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#7 UP4014Fan

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Posted 28 May 2024 - 01:45 AM

Well so far... it's an invisible photo.  sad.png

Yeah - iPhone is taking 2mb image. Give me a minute. 


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#8 UP4014Fan

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Posted 28 May 2024 - 01:54 AM

Here you go.
 
 
Piggyback mount


#9 B 26354

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Posted 28 May 2024 - 02:22 AM

Meh. The photo doesn't really show the piggyback mount... or reveal the connection between the piggyback and the camera.

 

I'm sticking with loose attachment of camera to mount, causing the camera to shift, over the course of the exposure period.



#10 UP4014Fan

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Posted 28 May 2024 - 04:21 AM

Meh. The photo doesn't really show the piggyback mount... or reveal the connection between the piggyback and the camera.

 

I'm sticking with loose attachment of camera to mount, causing the camera to shift, over the course of the exposure period.

Like I said, wasn’t a great photo.

 

Anyway, I think it was the  1/4” tripod screw on the adapter not being tight.  I’m going to get another of quick release plates.  That way I can tie down the telescope side and be reasonably assured I’m parallel with the axis of the tube.


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#11 MikeCMP

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Posted 28 May 2024 - 06:32 AM

Are you guiding your main cam using an oag ? The dithering might mess up your piggy back images, I used to piggy back a z61 and that would happen to some of my images.  Now you can synchronize with multiple instances of nina so I was going to maybe try it again.

 

Mike



#12 firemachine69

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Posted 28 May 2024 - 07:04 AM

Way too much weight for that mount. 




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