Trebor1

The Pentax documentation (lens diagram plus the 6 element/5 group description in the user manual), indicates that the rear group is a singlet and not a cemented doublet: http://www.submin.com/110/m ...

Normal human vision does not have  a 3:2 aspect ratio and it makes no difference whether you consider just the one eye, or binocular vision, because neither would be a good match! Trying to force ...

There is a slight problem in calling the disc camera a flop, because Kodak alone sold over 26 million of these cameras (8 million in the first year) and their profit margins on the film were huge, ...

Yes that's the one. Many people might have gone with a longer lens for a less than half-length portrait but it works really well.

Hi, your image 53, and one of the best in my opinion, has the shutter speed but neither the focal length or aperture listed in the Exif. Is this from the 135 mm, because of the out of focus trees ...

Way too many! https://www.researchgate.net/profile/Adam-Dabrowski-4/publication/257627565/figure/fig9/AS:668628479385612@1536424860981/Example-of-face-detection-in-image-with-low-resolution-of-54-4 ...

https://www.ephotozine.com/forums/topic/agfa-copyproof-paper--what-is-it--64731 Several answers but it appear that it is a direct transfer paper system, silver halide based, with the negative paper ...

She appears to have burst onto the magazine scene in 2012, although was previously a studio assistant and before that co-designed a 2012 fashion collection for Sarah Aphrodite, Sarah Kostecki, the ...

The choice of 36 mm for the long dimension was apparently semi-random. Oskar Barnack doubled the smaller dimension of the silent movie film size, based on his experiments when producing ...

Yes they did! Forget the Polaroid Swinger because there was the engineering marvel of the Polaroid SX-70 (can be found in a few design museums worldwide), the Polaroid 600 SE - a spinoff of the ...

He is not the only one! Some people regard the 35 mm as the most suitable for general use, if you only had one lens and it was a prime: It does landscapes, street scenes, environmental portraits ...

He makes simple mistakes within the first 2 minutes of the video, regarding sensor size for both his 35 mm full-frame and for Canon APS-C, not a good start! I gave up after the first 3.5 minutes.

Yes, 6X7 cameras, that post WW2 were never a 7:6 aspect ratio and  ranged from 56 x 68 (Mamiya Press at 1.3143:1 ), 55 x 70 (Pentax 6x7 ,14:11 through to the largest and most elongated Linhof ...

3:2 is a good aspect ratio for final printed or viewed images - Rubbish! I'm with David Bailey on this one: He describes the 24 mm x 36  mm format as awkward and unaesthetic. You might wonder that, ...

Tom, you are forgetting Fuji Instax! By 2016 it was outselling their digital products 4 to one and in 2019 it was 2:1 but with a high profit made on every print. This is a strange market but ...

Reordering the acronym results in ILEV . It depends on whether you attribute greater priority to the fact that the camera can take interchangeable lenses be they:Large or modest aperture, macro, ...

If you have a Live-View output then the electronic viewfinder or display screen does nor even have to be on the camera. This includes : 1. A camera with an EVF that is worn like a ...

I found this 2009 paper that indicates that higher scanning resolutions are required than the figures above. On a first generation negative movie film the film MTF is 50% at 80 lp/mm. With very ...

OK, I see. The author in the linked post was using the Raynox DCR-260 on a Sony a7 MKII (full-frame 24.3 MP sensor) and the cat images, including the close-up of the cat's head, looked impressive ...

CK, according the the linked article and also the Raynox website), the Raynox-DCR 250 is +8 dioptre ie. 125 mm and it is a triplet (3 elements, 2 groups) with high index optical glass, although ...