Pages: [1]   Go Down

Author Topic: Square (100mm) didymium filter  (Read 299 times)

Aram Hăvărneanu

  • Jr. Member
  • **
  • Offline Offline
  • Posts: 63
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 »
Logged

Alan Smallbone

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 770
    • APS Photography
Re: Square (100mm) didymium filter
« Reply #2 on: October 15, 2018, 09:49:20 AM »

I have the NISI and it works great.

Alan
Logged
Alan Smallbone
Orange County, CA

Aram Hăvărneanu

  • Jr. Member
  • **
  • Offline Offline
  • Posts: 63
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.
Logged

Alan Smallbone

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 770
    • APS Photography
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
Logged
Alan Smallbone
Orange County, CA

Alan Smallbone

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 770
    • APS Photography
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
Logged
Alan Smallbone
Orange County, CA

Aram Hăvărneanu

  • Jr. Member
  • **
  • Offline Offline
  • Posts: 63
Re: Square (100mm) didymium filter
« Reply #6 on: October 18, 2018, 09:37:18 AM »

Fantastic, thank you!
Logged
Pages: [1]   Go Up