delander †Posted October 16, 2008 Share #1  Posted October 16, 2008 Advertisement (gone after registration) Last week we had a few sunny days in the UK (it does not happen often) and I was out taking a few snaps with my M8/50 lux. I found that I could not use the F1.4 aperture because even at 1/8000 the camera was over exposing. So it seems that we need either a faster shutter speed or lower base ISO to accommodate these conditions. Something for the M9 perhaps?  Jeff Link to post Share on other sites More sharing options...
Advertisement Posted October 16, 2008 Posted October 16, 2008 Hi delander †, Take a look here Forced over exposure at F1.4 in sunny conditions?. I'm sure you'll find what you were looking for!
peterv Posted October 16, 2008 Share #2 Â Posted October 16, 2008 How about a good old ND filter? Link to post Share on other sites More sharing options...
stunsworth Posted October 16, 2008 Share #3 Â Posted October 16, 2008 Buy an ND filter, probably the cheaper option <grin>. Â The faster shutter speed on the M8 means that you'd have run into the same problem with a film M shooting 25 ISO Kodachrome. Link to post Share on other sites More sharing options...
delander †Posted October 16, 2008 Author Share #4  Posted October 16, 2008 Never had an ND filter, I worry about them causing image degradation and of course using them on top of the ir filter?  Jeff Link to post Share on other sites More sharing options...
ndjambrose Posted October 16, 2008 Share #5  Posted October 16, 2008 Never had an ND filter, I worry about them causing image degradation and of course using them on top of the ir filter? Jeff  So what's more degraded - an over-exposed image, or one shot through an ND? :-)  Actually, ND filters are optically very good if you buy the right ones. Some of the best landscape photographers in the world couldn't work without them. There's certainly no reason to ignore them - like all tools, they're there to solve a problem, and are useful when you need them. Link to post Share on other sites More sharing options...
lars_bergquist Posted October 16, 2008 Share #6 Â Posted October 16, 2008 A first class pola filter is just as good. There's no need to turn it around for maximum effect, it can be quite inconspicuous. Cine and video photogs too use ND filters all the time. Â The maximum sunlit exposure varies in different places. The 'sunny sixteen' rule (f:16 and 1/ISO) may hold in southern California, but not where I live. And we do not usually take pictures with the sun exactly behind us. My summer exposure is 1/1000 at 1:5.6 and ISO 160, or corresponding. But even that would mean 1:1.4 and 1/8000. Â The old man from the Age of Scheiner Speeds Link to post Share on other sites More sharing options...
SJP Posted October 16, 2008 Share #7 Â Posted October 16, 2008 Advertisement (gone after registration) My summer exposure is 1/1000 at 1:5.6 and ISO 160, or corresponding. That is 'the same' as 1/500 f/8, 1/250 f/11, 1/125 f/16. The last is as close as you can get to sunny 16 rule which would prescribe 1/160 f/16 for a sunny day. So I do not quite see how your summer light is different from the 'standard'. Link to post Share on other sites More sharing options...
jackal Posted October 16, 2008 Share #8  Posted October 16, 2008 Never had an ND filter, I worry about them causing image degradation and of course using them on top of the ir filter? Jeff   image degredation ? do your images get inspected by nasa or something ?   Real world pro-use: 2 or 3 stopper makes absolutely sod all difference to image quality Link to post Share on other sites More sharing options...
pemayeux Posted October 16, 2008 Share #9 Â Posted October 16, 2008 I use a 3 stop Heliopan ND filter over the Leica IR filter and the results are fine. Link to post Share on other sites More sharing options...
delander †Posted October 16, 2008 Author Share #10  Posted October 16, 2008 image degredation ? do your images get inspected by nasa or something ?  Real world pro-use: 2 or 3 stopper makes absolutely sod all difference to image quality   There is no need to be rude. I said at the outset that I was an amateur and had never used an ND filter.  Jeff Link to post Share on other sites More sharing options...
delander †Posted October 16, 2008 Author Share #11  Posted October 16, 2008 I use a 3 stop Heliopan ND filter over the Leica IR filter and the results are fine.  Thanks Paul that is useful information, I as wondering about a 2-stop filter.  jeff Link to post Share on other sites More sharing options...
Mauribix Posted October 16, 2008 Share #12  Posted October 16, 2008 I used an ND8 filter this summer to shoot @f1.4 in the desert... by my calculation it should have been "removing" something like 2,66 (2+2/3) stop... not fully 3 stops. Am I wrong guys?  BTW this is courtesy of Wiki:  1)Attenuation Factor 2)Filter Optical Density 3)f-Stop Reduction 4)% transmittance  (1) (2) (3) (4) 2 0.3 1 50% 4 0.6 2 25% 8 0.9 3 12.5% 64 1.8 6 1.5625% 1,000 3.0 10 <0.1% 10,000 4.0 13 1,000,000 6.0 20 Link to post Share on other sites More sharing options...
delander †Posted October 16, 2008 Author Share #13  Posted October 16, 2008 Is there any loss in contrast using these filters?  Jeff Link to post Share on other sites More sharing options...
Mauribix Posted October 16, 2008 Share #14 Â Posted October 16, 2008 If you're referring to macro-contrast I can firmly say that I never find any difference or evident alteration. BTW I cannot say about micro-contrast. Unfortunately I never checked 100% crop of comparison shots till now, but I've always wondered that to myself. I don't think something should change so evidently anyway, but this is just my guess. The filters should apply the same "alteration" to all the frame, even if I think that something related to wave-lenght response could interfere. Obviously the best is the filter the less altered your pictures will be. IMHO Link to post Share on other sites More sharing options...
lars_bergquist Posted October 17, 2008 Share #15 Â Posted October 17, 2008 Extra density applied evenly across the entire picture does not affect contrast, just as the gray film base of 35mm film doesn't. ND2 filters, which reduce light transmission by 75%, are the most useable in general photography. But a pola filter too can save the day. Â Use what you need to get the picture. If it is an interesting picture, it will not become less interesting because the 40 lpm contrast transfer at 12mm from the optical axis has dropped from 50 to 45% ... Â Sharpness is a fetish of people who take boring pictures. Â The old man from the Age of Tri-X Link to post Share on other sites More sharing options...
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