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ERF filters -PST
Casstony,
The new "upgraded" ERF is a blue colour whereas the original was a gold colour. It looks like ALL the gold ones may eventually suffer the same fate so I think their life could be limited. The complete front ERF element was replaced on the one I got but all the other rear elements were unchanged. There no "other" improvements on the monochromatic filters or the small blocking filter at the eyepiece.
According to Maurice Gavin who has tested both versions the blue coating gives a much brighter image and his exposures had to be significantly reduced.
I do see the the current ads mention "improved filters" but don't know what this means; I'd assumed it was marketing hype to overcome the customer concerns with the original.
Still piddling down at the moment, typical!!
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