| Joined: | Mon Apr 2nd, 2012 |
| Location: | South Lakeland, UK |
| Posts: | 4066 |
| Status: |
Offline
|
Lifepixel started to make other wavelength filters available but I am not aware of a 'better' 720nm filter unless they widened the pass band, but that might not be an improvement?
Just checked, David at ACS supplies 720 and 830nm filters but can supply others to order. The 830 images i have seen are way too stark and contrasty for artistic photography (unless of course that is the effect you want), more for forensic use I suspect. I may ask him for a spectrum graph of the ACS 720, just to see what I got but It works well, so in some ways there isn't much point except to guide others in the same direction and from an interest PoV.
This is an interesting site for bandpass charts:
http://rocoes.com.tw/2008e/optical/bandpass.htm
And:
http://rocoes.com.tw/2008e/optical/camfilter.htm
This page may provide a springboard to further information, some understanding of German may be needed! LOL:
http://www.baader-planetarium.de/sektion/s45/canon_astroupgrade-english.htm
Westonbirt sounds great, just let me know when. I really enjoyed the last visit, I have a fresh car now so perhaps the exhaust won't fall off on the way home!!! LOL
Yes I still have the green and grey cards, use the grey occasionally, The D200 is pre set by Eric but as he mentioned, it's all adjustable in processing by setting the WB to 2000 and tint to 80 or thereabouts. My D1 is set from brightly Sunlit grass.
As an aside, I remember from when I first used Bibble 4 the WB seemed to adjust lower than 2000 which seems to be the lower limit in must software/hardware and that was one of the reasons I switched to Bibble for the IR photo processing plus I liked the subtle control of the light shades often found in UV images. I have found now I am getting more proficient with Ps that isn't such an advantage but I did like the way Bibble 4 worked. There is also focus the de-cluttering factor of just using one application, rather than having to learn the finer and complex controls of multiple deep application software.
____________________
Robert.