I'm only modding the black box out, for now.
The pentaprism offers added protection, so be mindful of that when modding. I know it because I could feel something in my eyeballs in the mod, then nothing when I put back the stock PST. Through binos so I'm halving per eye exposure which means the penta must reduce exposure by a LOT.
In this context Diane's blog is important.
This Diane blog got me reading some science yesterday night! Our tolerance to IR isn't bad, decay seems slow and can be felt. Diane's numbers are missing the /cm2 so they're not useful out of the context of her blog, they only provide a ratio of blocking with and without the BK filter. This filter I'm not seeing in any of the mods, why is that? Have you guys measured the actual output after mod?
What's a narrowband "sort" filter? Couldn't find anything on sorting light.
Why is it made of two layers: one golden reflective and one red block?
Is the gold the ITF (metal deposit)? ref: https://luntsolarsystems.com/equipment-care/
Is the ITF a blocking filter, is ITF = BF?
It's tiny, about 4mm across, does it mean the PST is rocking a B400, is that what B stand for in the lunt and coronado diagonal (B
And why is the ITF in the diagonal and not in front of the etalon to protect it from heat and UV, from decay.
What is the other filter that's about 17mm in diameter which is in the tube that's holding this eyepiece holder? Is it the ERF like those expensive Baader everyone talks about?
Pedro's youtubes are only slideshows, I didn't find any value in it. Value is in understanding why things are where, or for those who can't be bothered with that, where to get the parts.