Woody Campbell Posted February 25, 2007 Share #1 Â Posted February 25, 2007 Advertisement (gone after registration) So I thought that I'd try shooting IR with my M8. I put a B+W 093 filter (blocks almost all non ir) on my 28mm f2.8 asp and went shooting. Â Some observations: at 2.8 nothing is in focus. Much better by f11. Probably better yet at f16 or 22. The rule of thumb for infinity focus for IR (infinity focus = 300xfocal length, or 9 meters for the 28mm) looks to be about right. Obviously a tripod is needed. Â Much more subject to flare than visible light. All images have a hot spot in the center. Â Any advice / experience would be very welcome. Here are two versions of the same image (with apologies for the pedestrian subject matter) - one straight out of the camera (note the hot spot) and same image fixed as best I could in PS. (iso 320) Â [ATTACH]27258[/ATTACH] Â [ATTACH]27259[/ATTACH] Link to post Share on other sites More sharing options...
Advertisement Posted February 25, 2007 Posted February 25, 2007 Hi Woody Campbell, Take a look here Shooting infrared. I'm sure you'll find what you were looking for!
Vivek Iyer Posted February 25, 2007 Share #2 Â Posted February 25, 2007 Woody, I would stay very far away from that Elmarit for IR. Link to post Share on other sites More sharing options...
Woody Campbell Posted February 25, 2007 Author Share #3 Â Posted February 25, 2007 Woody, I would stay very far away from that Elmarit for IR. Â Which lenses would you recommend? Link to post Share on other sites More sharing options...
Vivek Iyer Posted February 25, 2007 Share #4 Â Posted February 25, 2007 2.5cm f/4 W-Nikkor-C and 28mm f/6 Orion-15 (Russian lens)- both Topogon design. Top notch lenses for invisible light photography. Â Old Elmars, Summars, 2.8cm Hektor, old Summicrons... Link to post Share on other sites More sharing options...
marknorton Posted February 25, 2007 Share #5 Â Posted February 25, 2007 All very interesting because this is what gets added to the image when there is no IR cut filter in place as an out of focus haze - best kept out of the visible light image. Link to post Share on other sites More sharing options...
Donald Posted February 25, 2007 Share #6 Â Posted February 25, 2007 Woody, I'm puzzled by your photos that should show IR pictures taken with the B&W 93 filter. I have done IR pictures on the Kodak IR film years ago with a Kodak wratten filter and the results I got showed dark black skies with the images almost reversed. In your pictures the snow is still white and the sky still white. I would suggest that a lot of visible light still comes thru and doesn't get close to IR photography. Regards, Donald Link to post Share on other sites More sharing options...
Woody Campbell Posted February 25, 2007 Author Share #7  Posted February 25, 2007 Advertisement (gone after registration) Woody, I'm puzzled by your photos that should show IR pictures taken with the B&W 93 filter. I have done IR pictures on the Kodak IR film years ago with a Kodak wratten filter and the results I got showed dark black skies with the images almost reversed. In your pictures the snow is still white and the sky still white. I would suggest that a lot of visible light still comes thru and doesn't get close to IR photography. Regards, Donald  There's a light overcast today. I took the following image yesterday with sunny, deep blue sky conditions which is much more what you may have in mind. It's two stitched images (done in PTGui) with the 24mm at f2.8. B+W 093 filter Handheld at about 1/30. Iso 1250. At full resolution it is very soft focus - almost pinhole-like. Note the huge flare, with no apparent source of backlighting.  [ATTACH]27270[/ATTACH]  Vivek - thanks for the advice - I've ordered the Orion-15. Link to post Share on other sites More sharing options...
flavio Posted February 25, 2007 Share #8  Posted February 25, 2007 Woody, can you tell us time and place where you shot those pictures? Especially the third one. Thanks  Flavio Link to post Share on other sites More sharing options...
Vivek Iyer Posted February 25, 2007 Share #9 Â Posted February 25, 2007 Woody, You are welcome! I look forward to your images from it. Â If you care to, you could get some UV bandpass filters (Visible cut) and try UV with this lens. I have no clue if the M8 is UV capable. I do suspect it is. If you or anyone could check it, it will prompt me to get an M8. Â Here is a false color reflected ultraviolet capture through the Orion-15 (wide open) on Epson R-D1s. Link to post Share on other sites More sharing options...
Woody Campbell Posted February 25, 2007 Author Share #10 Â Posted February 25, 2007 flavio - 3rd image - yesterday at 12:41 EST, looking west, in Litchfield County, Connecticut. 1 and 2 are the same image, same place at 11:26 today. Â Vivek - Interesting image. What's the filter size on the Orion-15? I take it that you have to remove the filter to change the f-stop! What is the specification on your UV filter? I'm happy to get one and give it a try. Link to post Share on other sites More sharing options...
Vivek Iyer Posted February 25, 2007 Share #11 Â Posted February 25, 2007 Woody, Here is a grainy shot of my Orion-15 and a remounted Baader UV/Venus filter (cuts off visible and IR) filter. Â The filter comes in 1/4" size (Baader Accessories) (25mm filter). I remounted it in a 30.5mm B+W filter (after removing the UV/IR cut filter glass). Step rings 40.5 to 37mm and 37 to 30.5mm (eBay- "Heavystar") allow the remounted filter to be used on the Orion-15 (40.5mm filter). Â I also have attached a (turned out to be a rare collector item- i had it lying around) a Nikon Series VII to 52mm filter holder that fits the Orion-15 perfectly and allows me to mount 52mm filters. Â You need not worry about the aperture change. Wide open is optimum. There is plenty of DOF as well! :-) Link to post Share on other sites More sharing options...
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