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Equipment Discussions >> ATM, Optics and DIY Forum

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Pinbout
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Reged: 02/22/10

Loc: nj
Re: my 17.5" Coulter ronhci pic TDE? new [Re: dave brock]
      #5785397 - 04/08/13 07:59 AM

Quote:

His really dark image is supposedly inside focus.





the file name is "outside_zpsfa8f0f56.jpg"


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kfrederick
Carpal Tunnel
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Reged: 02/01/08

Re: my 17.5" Coulter ronhci pic TDE? new [Re: Pinbout]
      #5785403 - 04/08/13 08:05 AM

I would send Mark Harry the secondary to test . And go from there .Mainly use it and have fun .

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saemark30
Pooh-Bah


Reged: 02/21/12

Re: my 17.5" Coulter ronhci pic TDE? new [Re: kfrederick]
      #5785909 - 04/08/13 12:45 PM

I don't understand how you can do a Ronchi with eyepiece projection, Where do you place the Ronchi screen relative to the eyepiece?
I can see adding adding a barlow and placing the Ronchi screen after the barlow close to the focal plane would work.


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GlennLeDrew
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Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: my 17.5" Coulter ronhci pic TDE? new [Re: saemark30]
      #5785942 - 04/08/13 12:56 PM

I think it was actually afocal, with a lens on the camera and the Ronchi screen placed just in front of the camera lens.

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MessiToM
scholastic sledgehammer
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Reged: 12/21/09

Loc: Huntingdon PA
Re: my 17.5" Coulter ronhci pic TDE? new [Re: saemark30]
      #5785946 - 04/08/13 12:56 PM

I used a ronchi eye piece. Tuesday night I may have a chance at re testing.

I will know for sure then what my inside/outside images are like.


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MessiToM
scholastic sledgehammer
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Reged: 12/21/09

Loc: Huntingdon PA
Re: my 17.5" Coulter ronhci pic TDE? new [Re: MessiToM]
      #5785957 - 04/08/13 01:01 PM

also, iam going by these included pictures of defects seen with the EP
http://schmidling.com/etron.gif


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Pinbout
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Reged: 02/22/10

Loc: nj
Re: my 17.5" Coulter ronhci pic TDE? [Re: MessiToM]
      #5786210 - 04/08/13 03:25 PM

Quote:

Tuesday night I may have a chance at re testing.






What iso are you using? Can you also do star test images at x200 mag inside and out?

my favorite lens for afocal shots on a digital 35 is a 18-55. I have much better/faster lenses but for some reason I get best results with that lens. Also I get better result, much easier to see, with my canon then my nikon, for some reason the nikon has a darker finder image, can't see as well.


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