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What is your lowest scatter, short FL eyepiece(s)?

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#26 SteveG

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Posted 25 June 2014 - 12:25 PM

Steve, what barlow are you using?

I never thought about barlow on my Brandon 16mm, I just use a 6.7mm EP for highest power in some of my scopes. I'll have to give that a try on Saturn next time out.


I'm actually using (3) different barlows, all of which do not degrade the image and retain the high-contrast of the Brandon's. If I had to choose a favorite, it would be the Orion Trimag. The TV 3x is also very nice.

I find these barlowed Brandon's to be better than my Pentax XW's.

#27 REC

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Posted 25 June 2014 - 03:18 PM

Wow, better than the XW's! I'll have to try out the 16mm in my 2.5x Powermate on Saturn my next time out.

Thanks!

#28 bgi

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Posted 26 June 2014 - 07:55 AM

And by short, let's say 10mm or less.


Nagler 3-6 zoom.


^^^ What he said.

#29 PJ Anway

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Posted 26 June 2014 - 08:46 AM

ZAO-4, XO-5, ZAO-6, SMC-7

#30 Greg77

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Posted 26 June 2014 - 10:52 AM

...lowest scatter, short FL eyepiece(s)?

Thats easy...TMB SuperMonos. :)

CS!

Greg

#31 penguinx64

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Posted 26 June 2014 - 05:55 PM

8mm RKE

#32 precaud

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Posted 05 July 2014 - 01:28 PM

So, the next question is, what are the most significant contributing factors to diminish eyepiece scatter? From what I've read, it appears to be a combination of a) lens polish quality, and B) coatings. Is that so? Anything else?

#33 SteveG

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Posted 05 July 2014 - 01:52 PM

So, the next question is, what are the most significant contributing factors to diminish eyepiece scatter? From what I've read, it appears to be a combination of a) lens polish quality, and B) coatings. Is that so? Anything else?


Design

#34 precaud

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Posted 05 July 2014 - 08:13 PM

I was hoping for something a little more detailed than that...

#35 TPMack

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Posted 06 July 2014 - 12:22 PM

Zeiss 6mm monocentric.

#36 Jeff Morgan

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Posted 06 July 2014 - 11:45 PM

So, the next question is, what are the most significant contributing factors to diminish eyepiece scatter? From what I've read, it appears to be a combination of a) lens polish quality, and B) coatings. Is that so? Anything else?


Roland Christen has some interesting things to say on optics on the AP-UG. As much as I like CN, he will teach you 10x as much as anyone here.

To whet your appetite, properly applied coatings matter little for scatter (coatings give you transmission). Scatter is an inherent quality of the glass itself (imperfections, not absorption which is minimal). Also, the "crud" that gets between the lenses. And of course polish is important. He cites Zeiss in particular as polishing their legendary ZAO's twice as long as required.






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