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Forum: Pentax Q
12-29-2021, 01:58 AM
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I have also begun searching for this information... I have a lens from a super8 camera - a Nalcom f1.1 10.5mm - 30mm zoom.. that I would like to mount to my pentax q-s1...
At the wide end of the focal range, the lens has barrel distortion, however at the telephoto end distortion appears to be pretty minimal.
It has an aperture of f1.1 which could make it great as a lens that works very well in low light situations. I have no idea how sharp the lens is, but even if it is of "reasonable/ acceptable sharpness", which I know is subjective, it could end up being a great 'bang for buck' purchase for low light photography.
I found this article useful in terms of defining flange distance:
https://en.wikipedia.org/wiki/Flange_focal_distance
According to Wikipedia, the flange distance is "the distance from the mounting flange (the interlocking metal rings on the camera and the rear of the lens) to the film or image sensor plane. This value is different for different camera systems. The range of this distance, which will render an image clearly in focus within all focal lengths, is usually measured to a precision of hundredths of millimetres, and is not to be confused with depth of field.
The sensor size of the pentax Q-S1 is 7.44mm x 5.58mm = 41.52 mm2, and the flange distance is 9.2mm...
The negative or in today's terms "sensor" size of Super 8 film is 4.01mm x 5.79mm = 23.22 mm2, which is almost half the area of the Pentax Q-S1's sensor.
I am yet to work out the exact maths as I'm not that mathematically inclined, however, my suspicion at this stage is that when a Super8 lens is used on a Pentax Q-S1, its flange distance would have to be increased beyond 9.2mm in order for the image to be in focus throughout the lens' zoom range.
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Forum: Pentax News and Rumors
09-15-2021, 02:32 AM
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I know this design is product specific however using the Q series cameras was one of the most creative times of my life... so...
Long Live the Q!!
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