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ERF choice: new D-ERF vs. used C-ERF vs. other

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bluecoast
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ERF choice: new D-ERF vs. used C-ERF vs. other

Post by bluecoast » Tue Jul 09, 2019 3:02 am

Hello,

New here. I have a couple of PSTs and want to mod one into an 80mm scope I have (Vixen A80MF).

I found a used C-ERF 70mm which I'd have to mount down the tube. I have some basic questions:

Is Baader D-ERF superior to C-ERF? The same size new D-ERF is about 2x the price.
Is objective mounting superior to down-the-tube? For a start, I like the idea of being able to see the ERF.

Are there other 80-90mm ERF options out there that are safe (even if inferior) at a lower cost?

Thank you!

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marktownley
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Re: ERF choice: new D-ERF vs. used C-ERF vs. other

Post by marktownley » Tue Jul 09, 2019 5:03 am

Yes, DERF is superior to CERF. Objective mounting superior to sub aperture mounting, but will work.
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Carbon60
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Re: ERF choice: new D-ERF vs. used C-ERF vs. other

Post by Carbon60 » Tue Jul 09, 2019 5:17 am

Welcome ‘Bluecoast’. Best to pay the price, get a full size DERF and front mount it.

Stu.
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bluecoast
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Re: ERF choice: new D-ERF vs. used C-ERF vs. other

Post by bluecoast » Thu Jul 11, 2019 5:24 am

Thanks for the feedback. I guess I'll resolve to pay the price for the 90mm D-ERF. Is there any source to consider aside from Baader?

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Re: ERF choice: new D-ERF vs. used C-ERF vs. other

Post by marktownley » Thu Jul 11, 2019 6:15 am

Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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