Filter Discussions & Tests

370 topics in this forum

1. Trying to Prevent Filter Glass Oxidation #1 1 2 3 4 5

   By Andrea B., June 22, 2020   

   • Filters
   • 108 replies
   • 4.6k views
   • 
   • Andrea B.
   • May 28, 2021

2. Astronomy Filter Sizes and Adapters

   By enricosavazzi, September 10, 2015   

   • Filters
   • 7 replies
   • 4.6k views
   • 
   • enricosavazzi
   • October 9, 2015

3. Zomei IR-filter. Transmission graphs

   By ulf, August 25, 2017   

   • Filters
   • Infrared
   • 6 replies
   • 4.5k views
   • 
   • ulf
   • August 29, 2017

4. Easier Aerochrome: The Triple Bandpass TB550/660/850 1 2 3 4

   By Christoph, March 3, 2021   

   • Aerochrome
   • Filters
   • 84 replies
   • 4.4k views
   • 
   • photoni
   • April 5, 2023

5. Wanted - Andrea U 52mm filter Please ? 1 2

   By colinbm, December 8, 2013   

   • Filters
   • 26 replies
   • 4.3k views
   • 
   • Alaun
   • December 12, 2013

6. [Filter Test] Hoya B410: Quick Look

   By Andrea B., January 27, 2016   

   • Filters
   • 10 replies
   • 4.3k views
   • 
   • colinbm
   • January 28, 2016

7. New generic Venus Filter 1 2

   By NA_joey, November 29, 2018   

   • Filters
   • 31 replies
   • 4.3k views
   • 
   • ulf
   • June 24, 2021

8. Thought expt - correcting filter transmission with camera sensitivity and light intensity 1 2

   By JMC, March 26, 2018   

   • Filters
   • 33 replies
   • 4.2k views
   • 
   • OlDoinyo
   • March 30, 2018

9. Transmission through thin (0.5mm) Hoya U-340 and U-360 filters 1 2 3 4 5

   By JMC, September 12, 2020   

   • Filters
   • 106 replies
   • 4.2k views
   • 
   • Stefano
   • September 21, 2020

10. [Filter Test] 340/10 #3 Trying again with the 340/10

    By Andrea B., September 28, 2016   

    • Filters
    • 14 replies
    • 4.2k views
    • 
    • Andrea B.
    • October 5, 2016

11. Those ZWB filters again.....

    By Andrea B., February 18, 2018   

    • Filters
    • 4 replies
    • 4.1k views
    • 
    • Andrea B.
    • February 21, 2018

12. Rusty Nut and Bolt - Precision U D300

    By Erik Lund, May 14, 2013   

    • Filters
    • Camera
    • 7 replies
    • 4.1k views
    • 
    • nfoto
    • May 15, 2013

13. 280bp10 attempt 1 2

    By dabateman, September 21, 2018   

    • Filters
    • 33 replies
    • 4k views
    • 
    • OlDoinyo
    • October 21, 2018

14. Problems with small dichroic filter

    By Andy Perrin, April 12, 2016   

    • Filters
    • 17 replies
    • 4k views
    • 
    • Andrea B.
    • April 14, 2016

15. [Filter Test] AndreaU, BaaderU, PrecisionU with UV-Flash & S8612

    By Andrea B., May 17, 2015   

    • Filters
    • 7 replies
    • 3.9k views
    • 
    • colinbm
    • May 20, 2015

16. UV Allamanda Flower in Sunlight with AstroDon UVenus filter

    By colinbm, December 3, 2013   

    • Filters
    • 4 replies
    • 3.9k views
    • 
    • colinbm
    • December 14, 2013

17. First Experimental UV Kit Questions

    By djt, March 4, 2016   

    • Filters
    • 16 replies
    • 3.9k views
    • 
    • djt
    • March 10, 2016

18. Schott 2017 Filter Program - Graphs Compared 1 2 3

    By Cadmium, June 30, 2019   

    • Filters
    • 64 replies
    • 3.8k views
    • 
    • Cadmium
    • September 8, 2021

19. Photos with Various Schott & Hoya Filters :: K5 + UAT85/4.5

    By Andrea B., April 7, 2015   

    • Filters
    • 13 replies
    • 3.8k views
    • 
    • Andrea B.
    • April 11, 2015

20. UVA and UVB polariser - Moxtek UVD260A 1 2

    By JMC, March 7, 2019   

    • Filters
    • 35 replies
    • 3.7k views
    • 
    • dabateman
    • May 10, 2020

21. [Filter Test] Baader-U, Hoya 340 + S8612, Hoya 360 + S8612, Precision-U (old)

    By Andrea B., July 19, 2013   

    • Filters
    • 0 replies
    • 3.7k views
    • 
    • Andrea B.
    • July 19, 2013

22. Bold claim - Hitech ND filters and UV capability 1 2

    By JMC, January 4, 2019   

    • Filters
    • 40 replies
    • 3.7k views
    • 
    • aphalo
    • January 14, 2019

23. [Filter Test] Baader UV/IR-Cut, B+W 38/39/470, Schott BG40/S8612: IR-Blockers

    By Andrea B., September 3, 2016   

    • Filters
    • 7 replies
    • 3.6k views
    • 
    • Andrea B.
    • September 8, 2016

24. [Filter Test] BaaderU, KolariU, StraightEdgeU (v2016): 3 Filters and 3 Sunflowers

    By Andrea B., April 3, 2017   

    • Filters
    • 14 replies
    • 3.6k views
    • 
    • Guest
    • April 6, 2017

25. Filters available in larger sizes?

    By OlDoinyo, January 2, 2016   

    • Filters
    • 11 replies
    • 3.6k views
    • 
    • Cadmium
    • January 10, 2016