#1  
Old 04-06-2018, 12:59 PM
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Merlin66 (Ken)
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2" M48 filter spacers?

Anyone found a cheap source for 2" filter spacers?
I'm looking for at least a 50mm spacer to push a filter further along the optical axis (for solar testing/ imaging)
Similar to these:
https://www.ebay.com.au/i/253390844184?chn=ps
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  #2  
Old 07-06-2018, 12:42 PM
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Merlin66 (Ken)
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OK, ended up buying a set (5,10,20,30mm) from eBay......
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Old 07-06-2018, 12:46 PM
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Atmos (Colin)
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The only M48 spacer I've been able to find in Australia is one that Televue make for their eye pieces. Other than that it has just been ordering a limited number from Teleskop Service.

Ebay seems to be the way to go.
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Old 07-06-2018, 01:44 PM
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Merlin66 (Ken)
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I stand corrected!
The same product and supplier was cheaper from Amazon (!)
https://www.amazon.com/gp/product/B072M7CSLH/

(I'm trying to build a multi-element CaK solar filter and need to position the ERF element as far from the prime focus as possible)
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Old 08-06-2018, 11:17 PM
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Camelopardalis (Dunk)
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FWIW, the Baader fine tuning rings for the Hyperion eyepieces are M48 threaded and come in some more unusual lengths.

They are available in Australia and fairly cost effective, in addition to being well made.
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Old 11-06-2018, 11:35 AM
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Merlin66 (Ken)
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Thanks.
I'll report back when the adaptors arrive...
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Old 15-06-2018, 04:52 PM
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Merlin66 (Ken)
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They arrived...
Just as ordered, great fit and finish.
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