Lunt ERF question.

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GUS
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Lunt ERF question.

Post by GUS »

I have a lunt 100mm ERF and l am not sure which side to face towards sun as both sides look identical.Any help appreciated

Thanks


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swisswalter
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Re: Lunt ERF question.

Post by swisswalter »

Hi Gus

usually there is an arrow on the edge of the filter which should face the sun. In the worst case, you have only two trials to find out while imaging


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GUS
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Re: Lunt ERF question.

Post by GUS »

Thanks Walter, just had a look and could see no arrow. As i do not image, what other way to test-does it matter which side faces sun- is it safe to try visually both ways.

Thanks


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Re: Lunt ERF question.

Post by Merlin66 »

Yes, either way will be 100% safe.
If there's a coated reflective surface...this should face the sun , to prevent heat build up in the glass.


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Re: Lunt ERF question.

Post by GUS »

Thanks Merlin, Lunt site says one side broadband AR coated and other side dielectric IR blocking coated.Looked at filter and noticed one side is deep red and other side slightly less red, with a tint of purple.Would it be safe to say the redder side is broadband AR coated.

Thanks.


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Re: Lunt ERF question.

Post by Sungazer »

Hi, in my opinion the slightly purple side should face the sun, this should be the IR coating. My ERF has a similar colour and has always been that way round as advised by Schotts when purchased. Hope this helps, John.


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Re: Lunt ERF question.

Post by GUS »

Thanks John, that definitely helps.


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Re: Lunt ERF question.

Post by marktownley »

I agree with Sungazer


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Re: Lunt ERF question.

Post by GUS »

Thanks Mark.


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