Q2M - Spectral Sensitivity

[Peter Branch]

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One thing which has somewhat surprised me about my Q2M is the relatively strong effect that the Yellow filter, (13 073), has on blue skies.

Looking at the filter I would judge, based on my experience with B&W film, that it was no more than a pale yellow.

The effect however is comparable to a Wratten #9 on panchromatic film.

I can't find any information about the spectral sensitivity of the sensor or the spectral absorption of the filter.  

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[clasami]

This post on dpreview may answer your question (last paragraph). He's written more about it. https://www.dpreview.com/forums/post/66125590

[Peter Branch]

Thank you for the link.  It would certainly help to explain the effect if the spectral sensitivity of the Q2M is "Flat".  

[kirkmc]

The Q2M is spectrally flat because it doesn't register any color data, only luminance. So, as the DPreview article says, the difference you see is because black and white film is not totally monochromatic.

Edited May 24, 2022 by kirkmc

[JimKasson]

On 5/21/2022 at 9:30 PM, clasami said:

This post on dpreview may answer your question (last paragraph). He's written more about it. https://www.dpreview.com/forums/post/66125590

I would be very surprised if the spectral sensitivity of the Q2M were flat from 380 to 700 nm.

[JimKasson]

6 hours ago, kirkmc said:

The Q2M is spectrally flat because it doesn't register any color data, only luminance.

With no CFA, it won't register any color data no matter what its spectral sensitivity is.