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Some recent attempts: Neowise and M8/M20

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#1 Eric P

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Posted 21 July 2020 - 02:37 PM

Comet Neowise on E100 film. Cropped from the 58mm positive.

 

 

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#2 Eric P

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Posted 21 July 2020 - 02:39 PM

M8 and M20 wide field.  Using homemade 3D printed holders so there are some kinks to work out with the focus.  
 

 

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#3 canondslr

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Posted 21 July 2020 - 03:36 PM

Nicely done! You clearly picked up the Ion tail. I hope you can shoot a few more before it is gone.  

 

Is that the new E100 formula?  Great to see Neowise on film. I've taken a few of the comet with the new E100 in 35mm from a fairly dark location, exposing around 8 mins at F2.8.  But I haven't seen the results yet. Would love to know your approximate settings?

 

Planning final shoot tomorrow, and then off to the lab. 

 

Tom


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#4 Eric P

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Posted 21 July 2020 - 03:48 PM

Hi Tom

 

Yes, this is the new E100 and I am using a Celestron Schmidt camera 8 @ f1.5.  I did a couple of longer exposures (approx 5 min) but the comet detail was blown out.   

 

I processed with an Arista E6 kit with no push.



#5 canondslr

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Posted 21 July 2020 - 05:13 PM

Thank you Eric

 

I'm running on average about 1 to 2 stops below the equivalent exposure of (5 mins at F1.5). Fingers crossed.

 

Great camera, and very nice shot of M8/M20.

 

Tom



#6 TxStars

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Posted 21 July 2020 - 11:17 PM

Eric,

What type of holders did you print up for your schmidt camera?

I have the old standard 35mm metal holders for mine, but was thinking of making some 120 holders.. 



#7 telesonic

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Posted 22 July 2020 - 01:15 AM

Hey Eric, 

Nice photos, and thanks for sharing them here. Very super cool shots.... bow.gif

8" Schmidt Camera @ ƒ/1.7..... YOWZA! Very well done, I dig it, I'd bet that took time, and some effort to figure it all out Top notch work, I'd say. waytogo.gif

 

 

 

Cheers,

T

 

 

 

 


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#8 Eric P

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Posted 22 July 2020 - 06:11 AM

Eric,

What type of holders did you print up for your schmidt camera?

I have the old standard 35mm metal holders for mine, but was thinking of making some 120 holders.. 

 

It's nice being able to prep the film holders ahead of time and not worry about cutting film in the field which makes for a more efficient workflow.

 

 

Here is the design.  There is a slot on the rim for a thin neodymium magnet with 3M double sided tape which Amazon sells in 12 packs.  I also printed the holder upright to eliminate warping when removing from the print bed.  I used a 12" radius gauge (fret gauge) to check the curvature and a light sanding with 100 & 220 grit to smooth out the surface.  Finally painted the surface with Black 3.0 to prevent the reflections the standard holder yields on brighter stars.  Cutting the 120 film is done with an EKTools 2 1/4" paper cutter, and developing is done with a holder from JSO which should be easy to replicate with a 3D print.

 

Some changes needed: the back needs a center alignment post to help mate the holder to the core of the camera's magnet.  The retaining ring needs to have a smaller internal diameter as most of my shots had a popped edge from the film slipping.  The 3 retaining holes around the retaining ring and film base need to be slightly larger to accommodate M2 screws without reaming them.  

 

I have the STLs but I don't think CN allows those as an attachment so I can create a Thingiverse page. 

  

 

 

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Edited by Eric P, 22 July 2020 - 06:53 AM.


#9 Eric P

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Posted 24 July 2020 - 09:46 AM

Some other scans from 7/16

 

Scutum Cloud

 

 

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#10 Eric P

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Posted 24 July 2020 - 09:48 AM

Crop of NGC7000

 

 

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#11 canondslr

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Posted 25 July 2020 - 03:14 PM

Very nice!

 

That camera must be a lot of fun to use. 

 

Do you happen to have the approximate exposure values, and sky quality estimate? I'm guessing around 4 minutes at F1.5?

 

I plan to shoot more of the new E100 at a site with an SQM of around 21.3.  About 6.3 magnitude to my eyes. 

 

 

Tom



#12 Eric P

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Posted 25 July 2020 - 05:32 PM

I think NGC 7000 was around 10 min and Scutum cloud around 12 min. I’m guesstimating that Cherry Springs that evening was around 21.3 possibly a little less. Transparency started to deteriorate around 1a which was when I was imaging Scutum.

#13 canondslr

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Posted 25 July 2020 - 11:35 PM

Thank you for the information Eric!

 

Those conditions are very similar to mine. 

 

Tom



#14 Michal1

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Posted 26 July 2020 - 04:46 PM

Hi Eric, thanks for sharing these nice photos and information! E100 looks like a very usable film. How would you compare it with E200? How much do you have to increase the exposure time?

 

I am particularly happy to see this first film shot of the comet Neowise. Due to various problems, I was able to take only two images of it through clouds. I will share them later.



#15 Eric P

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Posted 26 July 2020 - 06:21 PM

Thanks Michal, E100 seems to be a bit better with Ha sensitivity than Provia but not on the level of E200.  I didn’t go longer than 12 minutes since I was going unguided.




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