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04-13-2019, 09:13 AM - 1 Like   #61
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Pentax Q & Q10 : IR-cut Filter Removal !

QuoteOriginally posted by kayakfari Quote
It's a 1.2mm fisheye 220 degrees. I just wanted a REALLY wide circular FE lens on the Q!
It looks the same as this one:
https://www.aico-lens.com/product/1-2mm-16mp-4k-fisheye-lens-ac1612mm/
.
220° Lens for the Pentax Q ?
4.2 mm Image Circle, more suitable for 1/3"-1/4" ?
At 2.1 mm from the center =~ about 37° Oblique Rays on the Pixels ?!
in the imx144 Specs, Sony measures Oblique Rays = 0-20°
and =~45° on the Protective Glass !?
.
Thus you'll have to Cut its IR-Filter-Box at less than 2 mm from the Sensor's Protective Glass !
... If you suppose the Sensor's Protective Glass to be 0.6 mm Thick :
http://mecastronics.free.fr/PentaxQ10AstroIR.html
( = the thickness of the IR cut Filter )
.
QuoteOriginally posted by kayakfari Quote
... BUT I was thinking that it may be even easier to just swap it out with an Action Cam lens (also M12 mount).
.
In the Kayak World, that wouldn't be too hard to get some friend lend you his Action Cam ?
One with 12 MP 1/2.3" sensor and the capability to record a Raw File...
... so you could evaluate the Aberrations ?
Especially the - Red Side - Chromatic Aberrations...
.
Can't wait to see the results...



Last edited by geo444; 04-13-2019 at 10:54 PM.
07-22-2019, 11:52 PM - 1 Like   #62
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@geo444 I now have an spare old working Q that I will start my IR filter removal surgery following your process. 1st to have a Q body with which I can do daytime IR photos and then can consider attempting deep space Astro.
08-02-2019, 06:49 PM   #63
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QuoteOriginally posted by kayakfari Quote
It's a 1.2mm fisheye 220 degrees. I just wanted a REALLY wide circular FE lens on the Q!
It looks the same as this one:
https://www.aico-lens.com/product/1-2mm-16mp-4k-fisheye-lens-ac1612mm/

So I will probably cut out the IR filter in a spare Q "sensor guts" that I have laying around and then try to connect that to the "rest" of my Q.
This way I can always switch back the original if I want to .. BUT I was thinking that it may be even easier to just swap it out with an action cam lens (also M12 mount).

@kayakfari, For that fisheye
You can probably do some work on the back of the lens itself to shorten it. There is an extra ir cut filter right on the end which we don’t need on a Q. Take off a couple mm maybe enough if you try. 16MP lens is very high resolving power and I would love to use it on a Q myself !

Last edited by 2old4toys; 08-02-2019 at 07:01 PM.
08-16-2019, 08:26 AM   #64
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Thanks! I thought about that but it looked like the IR glass was just a very thin cap at the end. So I didn't think it would help much. Now that you've cut out the Q IR cut filter no need to mess with the lens!

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