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Author Topic: NEC Spectraview II and Light Meter calibration  (Read 5327 times)

digitaldog

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Re: NEC Spectraview II and Light Meter calibration
« Reply #20 on: January 30, 2018, 02:22:32 pm »

No rabbit holes for me.  :)
 My concern is that the Minolta is in calibration and appears to be as it matches the digital camera and other meter which could both be used as backups.
OK, here's my cd/m^2 target calibration from my PA272W measured with an i1Display Pro and my Minolta Flash Meter III in Ambient Mode measuring same white is exIn 8.5 (8.0 at a 4th ASA 100 on meter).
So what does that mean?
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Alan Klein

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Re: NEC Spectraview II and Light Meter calibration
« Reply #21 on: January 30, 2018, 02:28:49 pm »

Thanks Alan G.  Using a flat light source like the monitor and an overcast day which I just tried, the Minolta reading matches the EV readings from the digital camera settings and the Sekonix meter.   I feel all three are equal in calibration.  Since the digital camera takes perfectly fine pictures, it's meter is acceptable.  So all three units are in calibration. 

In playing with the camera, I'm realizing that it may be the best instrument to use for meter readings.  Since you're able to see the actual picture it's taking and the histogram, what better instrument to use to set up my film camera?  Years ago I bought a polaroid attachment to the Mamiya RB67 just for that purpose.  So you can test a Polaroid shot first to see if you got the exposure right before inserting and using film.  Well, the digital now becomes the Polaroid shot.  The only issue might be if the digital camera is taking the correct exposure but the readings of where the aperture and shutter are working does not match. 

digitaldog

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Re: NEC Spectraview II and Light Meter calibration
« Reply #22 on: January 30, 2018, 02:30:51 pm »

Since you're able to see the actual picture it's taking and the histogram, what better instrument to use to set up my film camera? 
Only if you can view a raw Histogram! That's where RawDigger shines! https://www.rawdigger.com
« Last Edit: January 30, 2018, 02:39:19 pm by digitaldog »
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Alan Klein

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Re: NEC Spectraview II and Light Meter calibration
« Reply #23 on: January 30, 2018, 02:39:11 pm »

OK, here's my cd/m^2 target calibration from my PA272W measured with an i1Display Pro and my Minolta Flash Meter III in Ambient Mode measuring same white is exIn 8.5 (8.0 at a 4th ASA 100 on meter).
So what does that mean?
My Black reading is 214.9.  ????

I understand the histogram is only a rough estimate of the jpeg.  But the way the picture looks in the camera's digital display is the main ingredient in knowing if your photo is exposed right.  It seems to be better than just using a hand held meter.  I'll experiment with it next time I'm shooting film.  I always bracket +1 and -1.  So it should give me a decent benchmark.  Thanks.
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