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Baader 2" Diagonal ?

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#1 SloMoe

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Posted 15 August 2020 - 10:43 AM

I found reading in product descriptions about ERF coatings of this diagonal, would that suffice for use under a quark in a 130apo?

 

Baader 2" Clicklock Mirror Star Diagonal # CLDIAG-2 295610

 

Oversized 2 "dielectric lamda / 10 levels with 112mm optical length 

Mirror repels UV and IR radiation, provides high security at the solar observation in white light and with Ha-sun filters

Scratch-resistant, hard-coated mirror surface for safe cleaning, scratch-resistant even in extreme conditions

 

Baader 2" ClickLock clamp for ultrafast clamping action

 

Removable 2" Safety Kerf nosepiece

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Edited by SloMoe, 15 August 2020 - 10:50 AM.

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#2 BYoesle

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Posted 17 August 2020 - 11:09 AM

Should be fine.



#3 Volvonium

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Posted 17 August 2020 - 03:07 PM

I have that diagonal and it is a wonderful performer...I purchased it with a different application of white light observing with a front mounted solar film in mind, where the UV and IR rejection coatings on the diagonal's flat are just a form of insurance for me, should there be any failure with the solar film.   

 

The Baader diagonal has high reflectivity, so the coatings should be able to handle your application.... but with the amount of energy from an unfiltered  130mm objective, at an area where the light cone is nearing focus... I would still be cautious when it comes to safety and would feel much better with either:

 

UV/IR rejecting threaded 48mm filter on the nosepiece   

a dedicated tilted subaperture ERF prefilter 

or a front mounted tilted ERF 




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