DaveEP Posted June 23, 2007 Share #1 Posted June 23, 2007 Advertisement (gone after registration) I was wondering how many people have had faults with the lens type sensor.... I have two M8s, and one (old one - chrome) sees my 35/2 but the other (new one - black) does not. They both see my 72/2 and my Tri-Elmar..... They both also see my 50/2, 90/2 but only the chrome sees the 135 apo, not the black...... Any ideas? Another reason to let us select the lens in the menu...... also, why can't they just display the lens found as well??? Link to post Share on other sites More sharing options...
Advertisement Posted June 23, 2007 Posted June 23, 2007 Hi DaveEP, Take a look here Fauly Lens Type Sensor?. I'm sure you'll find what you were looking for!
cocker Posted June 23, 2007 Share #2 Posted June 23, 2007 Nelson Cameras? Sorry Dave - just saw your Atavar and couldn't resist! Not a serious comment on an obviously annoying phenomenon. Link to post Share on other sites More sharing options...
marknorton Posted June 23, 2007 Share #3 Posted June 23, 2007 Dave, since you have two M8s, trying taking a picture of the sensor of one with the other; remove any IR filter and shoot in total darkness. You should see 6 LEDs... Link to post Share on other sites More sharing options...
eyejockey Posted June 23, 2007 Share #4 Posted June 23, 2007 I couldn't get my M8 to see my lenses until I painted in the white code markings as well as the black (using nail polish). Some M8'ers have only needed to paint in the black. Hope this helps. Stephen Goldblatt Link to post Share on other sites More sharing options...
DaveEP Posted June 24, 2007 Author Share #5 Posted June 24, 2007 Dave, since you have two M8s, trying taking a picture of the sensor of one with the other; remove any IR filter and shoot in total darkness. You should see 6 LEDs... Thanks - I will try this tomorrow.... though it's going to be tough getting total darkness Link to post Share on other sites More sharing options...
marknorton Posted June 24, 2007 Share #6 Posted June 24, 2007 I should add high ISO as well, the light level is very small, and you'll need a long exposure because the LEDs are not on all the time. A missing LED will confirm a fault, but if you see 6, there may be still be a problem on the detection side. Link to post Share on other sites More sharing options...
scott kirkpatrick Posted June 24, 2007 Share #7 Posted June 24, 2007 Advertisement (gone after registration) I was wondering how many people have had faults with the lens type sensor.... I have two M8s, and one (old one - chrome) sees my 35/2 but the other (new one - black) does not. They both see my 72/2 and my Tri-Elmar..... They both also see my 50/2, 90/2 but only the chrome sees the 135 apo, not the black...... Any ideas? Sure. First translate all the lenses that are recognized into their bit codes: 75/2 100100 TE 101010 50/2 iv/v 100001 90/2 100101 Then let's look at the ones which are not recognized. 35/2 asph 011110 135 apo 001001 So it could be that either the first led or the first receiver is out. All of the other bits vary without changing the result obtained. And if you turn the first bit of the not-recognized lenses into a '1' instead of a '0', you get invalid codes. scott The lens codes are listed at Leica M8 Lens Codes Link to post Share on other sites More sharing options...
scott kirkpatrick Posted June 24, 2007 Share #8 Posted June 24, 2007 (Too much time went by for another edit) -- incidentally here is a case where knowing what Leica puts into their EXIF would help diagnose this kind of problem. The camera knows 8 bits of information about the lens -- two from the two microswitches that sense the mount lever and frame lever positions and six from the six black or white bar codes. Good engineering practice would be to save that information as well as to place the ascii name of the lens, its focal length and its maximum aperture in the standard fields that IrfanView, C1, and Adobe products all expose for us. So if we could inspect the saved code when a lens is mis-identified (as has been observed) or not identified at all (as in this thread), it would not be necessary to own eight lenses and use Carsten's table to see what is not working. It would also be nice to know what aperture the M8 estimates by comparing the light intensity seen by the blue dot with that seen by the internal meter, to jog our memories about what aperture was used in shooting a picture more than a few days ago. But since that estimate is open to error through no fault of the camera, i can understand if Leica is reluctant to make it available. Still some of us would gratefully accept that information, and not be upset if it is only an estimate. scott Link to post Share on other sites More sharing options...
isaac Posted June 24, 2007 Share #9 Posted June 24, 2007 Hello Scott! It would also be nice to know what aperture the M8 estimates by comparing the light intensity seen by the blue dot with that seen by the internal meter, to jog our memories about what aperture was used in shooting a picture more than a few days ago. But since that estimate is open to error through no fault of the camera, i can understand if Leica is reluctant to make it available. Still some of us would gratefully accept that information, and not be upset if it is only an estimate. Do you mean something like that (I am not sure that it is realy 'FlashEV'): ExposureRange -1 - 19EV, LWt 6.00 ExtEV 1.72 IntEV 4.42 FlashEV 2.50 Ext-Int -2.70 ExposureRange -1 - 19EV, LWt 5.00 ExtEV 1.72 IntEV 3.54 FlashEV 3.00 Ext-Int -1.82 ExposureRange -1 - 19EV, LWt 4.00 ExtEV 1.72 IntEV 2.52 FlashEV 4.00 Ext-Int -0.80 ExposureRange -1 - 19EV, LWt 3.00 ExtEV 1.72 IntEV 1.53 FlashEV 5.00 Ext-Int 0.19 ExposureRange -1 - 19EV, LWt 2.00 ExtEV 1.72 IntEV 0.51 FlashEV 6.00 Ext-Int 1.21 ExposureRange -1 - 19EV, LWt 1.00 ExtEV 1.72 IntEV -0.52 FlashEV 7.00 Ext-Int 2.25 ExposureRange -1 - 19EV, LWt 0.00 ExtEV 1.72 IntEV -1.65 FlashEV 8.50 Ext-Int 3.38 ExposureRange -1 - 19EV, LWt 0.00 ExtEV 1.72 IntEV -1.65 FlashEV 8.50 Ext-Int 3.38 ExposureRange -1 - 19EV, LWt -1.00 ExtEV 0.78 IntEV -2.59 FlashEV 4.00 Ext-Int 3.37 ExposureRange -1 - 19EV, LWt -2.00 ExtEV 0.78 IntEV -3.81 FlashEV 4.00 Ext-Int 4.59 ExposureRange 0 - 20EV, LWt 0.00 ExtEV -2.34 IntEV -0.78 FlashEV 3.50 Ext-Int -1.56 ExposureRange -1 - 19EV, LWt 1.00 ExtEV -2.43 IntEV -0.88 FlashEV 3.50 Ext-Int -1.55 ExposureRange -2 - 18EV, LWt 1.50 ExtEV -2.51 IntEV -0.98 FlashEV 3.50 Ext-Int -1.54 ExposureRange -3 - 17EV, LWt 2.50 ExtEV -2.57 IntEV -1.07 FlashEV 3.50 Ext-Int -1.50 ExposureRange -4 - 16EV, LWt 3.50 ExtEV -2.66 IntEV -1.17 FlashEV 3.50 Ext-Int -1.49 Link to post Share on other sites More sharing options...
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