Concorde-SST Posted September 9, 2007 Share #1 Posted September 9, 2007 Advertisement (gone after registration) Hello, I was playing around with my M8 and the WATE plus a 67mm Infrared filter (B+W 093 IR). The effect is truly spectacular. The only problem I face is a somewhat milky and rather large spot in the center of the picture. I tried to mask off the openings of Leica´s 67mm filter holder for the Tri-Elmar 16-18-21 with black duct tape, but the problem persists. Have I overlooked some special requirements for infrared photography? The lens and the camera are perfectly fine in normal photography. The filter is brand new and spotlessly clean. I suspect some light / infrared leaking somewhere? I´d be happy if someone can help me out?! I wish you all a happy and peaceful sunday. best, Andreas / Concorde-SST Link to post Share on other sites More sharing options...
Advertisement Posted September 9, 2007 Posted September 9, 2007 Hi Concorde-SST, Take a look here M8 + Infrared photography + WATE. I'm sure you'll find what you were looking for!
jimcollum Posted September 9, 2007 Share #2 Posted September 9, 2007 Hello, I was playing around with my M8 and the WATE plus a 67mm Infrared filter (B+W 093 IR). The effect is truly spectacular. The only problem I face is a somewhat milky and rather large spot in the center of the picture. I tried to mask off the openings of Leica´s 67mm filter holder for the Tri-Elmar 16-18-21 with black duct tape, but the problem persists. Have I overlooked some special requirements for infrared photography? The lens and the camera are perfectly fine in normal photography. The filter is brand new and spotlessly clean. I suspect some light / infrared leaking somewhere? I´d be happy if someone can help me out?! I wish you all a happy and peaceful sunday. best, Andreas / Concorde-SST unfortunately, this is a characteristic of that lens design. It's known as a hot spot, there's really no way of correcting the color image, but you can normally salvage a b/w, since this spot is usually dominant in one color channel. jim Link to post Share on other sites More sharing options...
farnz Posted September 9, 2007 Share #3 Posted September 9, 2007 Andreas, I've found the same hot spot on all my lenses with IR. I'm of the opinion that its related to aperture because the more you stop down the smaller and brighter the hot spot gets. I control it by shooting wide open to get the least exposure variation between the hot spot and the surrounding image and then use vignetting control in ACR or LR to minimise its effect on the finished image. Shooting wide open also allows me to hand hold in many instances but I prefer not to increase ISO beyond ISO 320 because noise above this level in B&W IR looks ugly to me - not like film grain at all. Pete. Link to post Share on other sites More sharing options...
Concorde-SST Posted September 9, 2007 Author Share #4 Posted September 9, 2007 Hello, Darn, thats too unfortunate about the hot spot. I´ll try to fix it in B/W mode. What color channel is the hot spot? Red? Yes, I noticed the increase of intensity with smaller apertures. I shoot from a tripod and ISO 160 to have max quality. This leads me to another thought: Have you tried doing IR photography with another lens which isn´t from Leica? Or is it a physical one affecting the camera? Thank you all! best, Andreas. Link to post Share on other sites More sharing options...
farnz Posted September 9, 2007 Share #5 Posted September 9, 2007 Andreas, Yes, I get the same with a CV15. I used to use a tripod but shooting wide open means I can usually hand hold at ISO 160 because I normally restrict shooting IR to sunny days when there's plenty of infrared about. Pete. Link to post Share on other sites More sharing options...
Concorde-SST Posted September 9, 2007 Author Share #6 Posted September 9, 2007 Pete, thank you. I guess the best approach to this problem is to use a very fast lens wide open. The f4 of the WATE seems not to be the best solution. Have you tried IR photography with a Noctilux for example? The fastest lens I own is a f2 summicron (50mm). I just have one filter, didn´t buy another because of this problem. best, Andreas. Link to post Share on other sites More sharing options...
farnz Posted September 9, 2007 Share #7 Posted September 9, 2007 Advertisement (gone after registration) Andreas, No, regrettably I don't have the luxury of a Nocti. The fastest I have is a 35 Summicron asph but the CV15 is f4.5 and I manage to hand hold that with a 093 filter on sunny days so the WATE should be fast enough wide open although the additional weight might be a factor. I manage to hand hold to 1/15th regularly and 1/8th on occasion by bracing the M8 against my brow (I'm a left-eye shooter), exhaling, relaxing and then gently squeezing the release. Pete. Link to post Share on other sites More sharing options...
DaveB Posted September 9, 2007 Share #8 Posted September 9, 2007 I can't figure out exactly what's going on with wide angles and IR with the M8. Using the B&W 093 on the CV15 a hot spot is sometimes, but not always, apparent. Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! It doesn't seem to have anything to do with aperature either. I'm always shooting this lens wide open or pretty close to wide open. I wonder if it has more to do with the direction of the sun? Perhaps something about the susceptibility towards polarization of IR light is more obvious with wide lenses. I do agree that fast lenses are super with IR. I like my 50mm Summilux for IR because I never see that bloom or hot spot in the center and it allows one to use selective focus. Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! It doesn't seem to have anything to do with aperature either. I'm always shooting this lens wide open or pretty close to wide open. I wonder if it has more to do with the direction of the sun? Perhaps something about the susceptibility towards polarization of IR light is more obvious with wide lenses. I do agree that fast lenses are super with IR. I like my 50mm Summilux for IR because I never see that bloom or hot spot in the center and it allows one to use selective focus. ' data-webShareUrl='https://www.l-camera-forum.com/topic/33015-m8-infrared-photography-wate/?do=findComment&comment=349493'>More sharing options...
Concorde-SST Posted September 9, 2007 Author Share #9 Posted September 9, 2007 Wow, great images! I think I have noticed the same discrepancy. A while ago I was in NYC and shot some pics in Central Park. Some of the pics had the spot, some of them not. It indeed seems to be dependent of the direction where the infrared source comes from. I don´t own a polarizer filter for this combo, but I guess it would fix? Have you tried? Also, I noticed that this issue hardly happens when shooting inside a room. For example, when I shoot a sofa in a living room (just an example) with the light coming from the large windows in a 90 degree-angle, there´s a spot. When I shoot the whole room with a 45 degree angle, there´s no spot (maybe because its invisible with the opaque white curtains). Strange! thanks again! Andreas. Link to post Share on other sites More sharing options...
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