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New Generation 3 Lumicon OIII filters are here!

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#26 25585

25585

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Posted 16 June 2019 - 09:16 AM

Yes, I have tests for both.

The new filter:

--has less long wavelength transmission in the 650-750nm range than the old filter (OOB)

--has a higher % transmission

--has a slightly (1-2nm) narrower bandwidth.

 

The old filter was my "reference standard".  No longer.

Though both are superb (2009-2010 version and 2018 version), my new reference standard is another filter, but it is

not "visually significantly different" from the 2018 Lumicon Gen.3, which is an excellent filter!

I will always keep my late 80s-early 90s Lumicon OIII & UHC. The ones that came in dark blue translucent boxes. No later OIII has made nebula shine in the same way.

 

What is the bandwidth breakdown of the Gen 3?


Edited by 25585, 16 June 2019 - 09:17 AM.


#27 Starman1

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Posted 16 June 2019 - 11:11 AM

11nm bandwidth FWHM 494nm-505nm

3.5% transmission at 486.1nm

95.1% transmission at 495.9nm

94.7% transmission at 500.7nm

<0.1% transmission at 656nm

 

I would have my older (pre-2000) lumicon filter tested.

They are known to deteriorate:

https://www.cloudyni...ters/?p=7048175

and the posts following.


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