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09-18-2020, 04:13 AM - 3 Likes   #1
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Full-Spectrum for everyone

Sigma Foveon cameras have long been available with user removable IR hot-mirror component. It is very easy to operate and also works as dust spot eliminator when installed (dust located on a filter away from sensor stack does not pop up easily in the photos).

This would enable easy IR and even UV photography for everyone provided lenses are good for such task.

Pentax could do better than Sigma easily - just provide various IR cutoff filters which can be installed in place of the standard hot-mirror filter. These guarantee a lot better flare resistance compared to screw-on filters.

Full-spectrum or at least two-spectrum (VIS-IR) for everyone!

09-18-2020, 02:16 PM   #2
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That's actually a pretty awesome idea, and - compared to other areas of camera development - arguably not that difficult to achieve. It's mostly design of the mirror box internals and the swappable filters, with perhaps a little software to leverage them to best advantage.
09-19-2020, 03:38 AM   #3
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Ya! And it would give Pentax yet another unique feature to make K-1 MK3 better than any unmodified FF MILC out there. Same goes for APS-C.
09-19-2020, 05:17 AM   #4
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I agree -- fantastic idea. I'd be a buyer. If we could also get support for focus stacking I'd be in seventh heaven ....

09-25-2020, 01:02 AM   #5
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Just noticed the thread... this idea is certainly cool! Would it be -in principle, at least- possible to swap the standard filter with something astro-minded as well (Ha was it?). As far as I know those are inserted under the mirror but that of course is slightly more cumbersome, and on an unmodified camera the end result is still affected...


I probably wouldn't use it too often, but anything that makes Pentax the option for outdoorspeople is a good feature to have IMO .
09-25-2020, 02:07 AM   #6
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I like the idea but can consumers be trusted not to make a mess of it? Changing a focusing screen is kinda tricky. Changing a filter on the sensor would be even trickier. If you get it wrong you can scratch and/or ruin your sensor.
09-25-2020, 02:14 AM   #7
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QuoteOriginally posted by Wasp Quote
I like the idea but can consumers be trusted not to make a mess of it? Changing a focusing screen is kinda tricky. Changing a filter on the sensor would be even trickier. If you get it wrong you can scratch and/or ruin your sensor.
On the Sigma cameras, if I remember correctly the filter isn't attached to the sensor module but sits just in front of it, held in place by the surrounding mirror box...
09-25-2020, 09:52 AM   #8
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Yes, I have Quattro SD and the filter is right before the lens mount. It can be clipped off and lifted out easily with two fingers or a pair of pliers.

There is already clip-on filter available which can be installed between the mirror and the lens. Actually at least two products exist - Pro Planet and XTC. Former is more for astro and latter for general IR shooting.

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