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Square (100mm) didymium filter
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Topic: Square (100mm) didymium filter (Read 1340 times)
Aram Hăvărneanu
Full Member
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Posts: 214
Square (100mm) didymium filter
«
on:
October 14, 2018, 01:09:00 pm »
I have a circular Tiffen didymium filter. Generally it has almost no effect, but during fall it has quite a useful effect. Also it's very useful for astrophotography.
I want a square one, though, because it's more versatile. Also the Tiffen filter is uncoated. Who manufactures square didymium filters?
Breakthrough
has one
, but it's on backorder.
Tiffen
used to have one
, but no longer.
Anyone else?
«
Last Edit: October 14, 2018, 01:27:57 pm by Aram Hăvărneanu
»
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BRH
Newbie
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Posts: 10
Re: Square (100mm) didymium filter
«
Reply #1 on:
October 14, 2018, 01:47:23 pm »
Try the following;
https://www.lonelyspeck.com/purenight/
https://nisifilters.com.au/product/nisi-100x100mm-natural-night-filter/
https://www.amazon.com/NiSi-100X100mm-Natural-Night-Astrophotography/dp/B06XK8H3L9
https://www.alibaba.com/product-detail/Premium-Optical-Quality-Didymium-Glass-PNB586_1867203987.html?spm=a2700.7724857.normalList.33.4f6f706bHrF5by
Bryan
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Alan Smallbone
Sr. Member
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Posts: 788
Re: Square (100mm) didymium filter
«
Reply #2 on:
October 15, 2018, 09:49:20 am »
I have the NISI and it works great.
Alan
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Alan Smallbone
Orange County, CA
Aram Hăvărneanu
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Posts: 214
Re: Square (100mm) didymium filter
«
Reply #3 on:
October 15, 2018, 09:58:32 am »
Is the NiSi one truly Didymium glass? I've heard conflicting reports.
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Alan Smallbone
Sr. Member
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Posts: 788
Re: Square (100mm) didymium filter
«
Reply #4 on:
October 18, 2018, 09:21:08 am »
I have another from a random Chinese manufacturer that seems to behave much like the Nisi. I got it because the lens I wanted to use it on was the Laowa 9mm for FujiX and the square filters system caused vignettes. In taking images at night I see very much the same effect from both filters. I did not test the spectrum of both but did test the Nisi, and here is the result:
https://flic.kr/p/26EKVpN
There is a big notch in the spectrum around the sodium vapor light spectrum. So it is blocking mostly yellows.
Alan
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Alan Smallbone
Orange County, CA
Alan Smallbone
Sr. Member
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Posts: 788
Re: Square (100mm) didymium filter
«
Reply #5 on:
October 18, 2018, 09:23:16 am »
As a side note in general I avoid Tiffen filters, and this is my own bias. I have had too many experiences with poor filter quality or color casts that I just avoid them in general.
Alan
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Alan Smallbone
Orange County, CA
Aram Hăvărneanu
Full Member
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Posts: 214
Re: Square (100mm) didymium filter
«
Reply #6 on:
October 18, 2018, 09:37:18 am »
Fantastic, thank you!
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