Quote:
Originally Posted by Suzy_A
From the graph, it shows that it lets through extended red and the longer wavelength IR, but chops out the shorther and medium IR.
Have a look at my tests with a clear filter replacement ... and various other over the lens filter combinations.
http://www.iceinspace.com.au/forum/s...ad.php?t=15205
The filter in my 30D (since stolen) was the clear one - the red line up the top in the graph I've attached.
I found the best colour correction filter to be the B+W 489. although the 486 was good as well, but these are expensive filters... The 489 has a green tint while the 486 is clear with an UV/IR interference surface and looks very sexy, but gives weird effects at wide angle - below about 20 mm on a 1.6 crop camera like the 30 or 40D. Below about 20 mm, the angle of the light coming in results in green vignetting of the image corners.
http://www.madsens.com.au/hoyacart/b+w/screw.htm
The CC1 filters from the USA are cheaper, but shipping them to Oz is a pain.... They have a distinct green tint.
http://www.maxmax.com/aXNiteFilters.htm |
Thanks Suzy for your input on this. So that means my camera lets in the long IR but blocks the short/medium wavelength? By adding a typical IR rejection filter, this will block the long IR wavelength and makes no difference with the short/medium IR wavelength?
your first image in your post looks very much like mine which definitely indicates that my camera doesnt block IR at all :
http://www.iceinspace.com.au/forum/a...se.php?a=19946
Sorry to hear about your 30d
ouch that will hurt alot. In conclusion of your test images, i think the B+W 486 image (the 2nd one) has the best colour balance.
great recommendation too suzy and the filtershop is australian also.