fullspectrum Monochrome Full Spectrum - UV - VIS - IR - someone modified it

[ph0toni]

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Analogue full spectrum - with 6x6 photographic film - Rollei Infrared - from deep UV to IR 720 nm

(I'm still looking for a good 246 at a good price to do the modification)

 

 

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[ph0toni]

I went crazy and got an M246
I knew it wasn’t the perfect camera for my research, but I got some interesting results - all F8 - auto iso - Garda Lake from Desenzano (ovest to nord)

with a UV filter (range 370>400 nm) 1/45 - 3200 iso

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.
with an orange filter to remove the haze (range 530>700 nm) 1/2000 - 320 iso

.
with a dark red filter (range 670>700 nm) 1/30 -1250 iso

.
with a 720 nm IR filter (range over 720 nm) 1/30" - 12500iso

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P.S.

I read that the M9M is the best for IR photos, I wonder how it is possible to make a precise focus (it does not have live view).

Thanks

Toni

Edited May 15 by ph0toni

[fotomas]

Maybe off interest (if you not already know).

[ph0toni]

4 hours ago, fotomas said:

Maybe off interest (if you not already know).

@fotomas Thanks for the link, I had no feedback on the various IR filters with M246, this post is clear!
... but it was complicated to translate from German to Italian
.
I have a Sony A7 full spectrum, I understood well the differences in speed (+12 stops) and file quality (much sharper). If I can't modify the M246, I will have to give up UV and IR
Maybe UV + visible ... similar to orthochromatic film is easy, but the wood effect of the foliage can only be obtained with the help of a tripod.
I took an M246 because I believe that only a mono sensor can be translated into grayscale with color filters. I tried many color filters with my standard Nikon Z7, the raw does not have a clear and logical response, if it is converted to black and white.
Thanks

-

[fotomas]

With BW-colorfilters with digital color-cameras never worked for me. Better to do the BW conversion in the post. Can't tell for a full-spectrum camera.

But with an monochrome camera it's possible and you have to use them. Another comparison with contrast filters here. Could be I have posted the link before in one of your threads.

Since you can push the ISO on the M 246 up to 10.000 (at least for me with acceptable IQ) it could even be possible without a tripod in bright light, but in general a tripod helps a lot.

Unfortunately my Italian is rather basic😥

[ph0toni]

On 5/24/2025 at 10:30 PM, fotomas said:

With BW-colorfilters with digital color-cameras never worked for me. Better to do the BW conversion in the post. Can't tell for a full-spectrum camera.

But with an monochrome camera it's possible and you have to use them. Another comparison with contrast filters here. Could be I have posted the link before in one of your threads.

Since you can push the ISO on the M 246 up to 10.000 (at least for me with acceptable IQ) it could even be possible without a tripod in bright light, but in general a tripod helps a lot.

Unfortunately my Italian is rather basic😥

I have been asking persistently if it is possible to modify the M series, the answer is that they all have the hot-pass filter glued in... and it is not possible.
So I will use my M246 with near UV and near IR filters
This is a comparison with a similar 24 Mpx RGB sensor

Thanks . Toni

.

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