Archived posting to the Leica Users Group, 2001/11/14
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On Wed, 14 November 2001, Jim Brick wrote: > > Use a B+W KR3 filter. The higher you go, when there is clear blue sky, the > higher the color temp as there is less atmosphere (moisture & stuff that is > packed down at lower elevations). I've taken ton's of Leica photographs in > the Colorado Rockys and after the first roll, started using a KR3, and all > was well after that. > > Please note, it is NOT UV that is causing the blue, it is simply a higher > color temp of the light. Your Leica lens has all of the UV filtering > built-in. You need to warm up the light, convert it back down to 5000-8000 > Kelvin (from roughly 12,000 Kelvin) color temp. Use a KR3. > > Jim > Another method is to use Photoshop. The advantages include making the *exact* color correction you need, and no filter factors. Here's a good example of how not using a warming filter saved the photo (this .jpg matches the color of the original slide, an old Kodachrome X): http://www.wildlightphoto.com/technique/bluepika.jpg The Pika was lit by the deep blue sky at high altitude; even the sun had gone behind a cloud. Since asking the Pika to wait until the cloud moved was pointless, I shot anyway, 1/60 sec @ f/4.5. This was with a 300mm f/4.5 lens, leaning against a rock. Since a warming filter works by reducing the cooler wavelengths, using the warming filter would have taken away more of the light than the nominal filter factor would indicate. 1/60 sec was slow enough; a slower shutter speed would likely have given me too much camera motion. By using Photoshop I can make the nessesary color corrections: http://www.wildlightphoto.com/mammals/pika.html This photo has been one of my most successful, having been used in several books and magazines (including Audubon magazine) and has also been quite popular as a print. Doug Herr Birdman of Sacramento http://www.wildlightphoto.com ___________________________________________________ The ALL NEW CS2000 from CompuServe Better! Faster! More Powerful! 250 FREE hours! Sign-on Now! http://www.compuserve.com/trycsrv/cs2000/webmail/ - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html