Forum: Pentax SLR Lens Discussion
01-25-2022, 10:42 AM
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Forum: General Talk
11-30-2021, 09:02 PM
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Until Yngwie Malmsteen shows up, and then those 10 or 20 will claim they will do it slower and with more soul? :lol:
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Forum: Pentax SLR Lens Discussion
09-03-2021, 08:05 AM
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I was curious about the 35mm f1.4 Rokinon lens shown on the forum home page (deal of the day) so I went the the lens data base to find it. To my surprise, I didn't see a Rokinon list of prime lenses in the third party data base. Is this just that there aren't many Pentax users of Rokinon, or did these get left out? Lastly I considered my own vulnerabilities to slow thinking with age so if that's the case, just point me in the right direction.
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Forum: Film SLRs and Compact Film Cameras
06-28-2021, 05:22 AM
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I am setting up a wiki-style information page for TAKUMAR lenses at camera-wiki.org
It is a work in progress, but any comments/criticisms/additions/discouragement are very welcome
Admin: Please move this thread if it's not allowed
Thanks
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Forum: Photographic Technique
06-23-2021, 05:58 AM
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Yes, the printer can only make dots of full color. Pale colors (e.g., gray, pink, light green, etc.) require leaving white space between the dark dots. (if you look carefully at an inkjet print with a jewelers loupe or microscope, it looks like a pointillist painting.)
As for the colors, the inks are actually known as subtractive colors: cyan, yellow, and magenta. Cyan dots absorb red light. Yellow dots absorb blue light. Magenta dots absorb green light. Thus, for example, a cyan dot with a yellow dot on top (subtracting both red and blue light) creates a saturated green dot. In theory, a cyan+yellow+magenta dot would be black but limitations of the inks mean it's not a very deep black, plus it uses a lot of expensive color ink, plus it makes the paper very soggy. Thus, color printers also include black ink. The resulting color system is known as CYMK, where the K is the black "Key" ink and avoids confusion with using "B" for black which could be confused for blue.
Getting non-saturated colors (e.g., pale green) means putting down a cyan dot, a yellow dot, and then leaving some space of white paper. Getting full color with 8-bits per color means dividing the page into 8-dot by 8-dot squares such that one square (one pixel) can any number of dots from 0 to 256 of each of the inks to create anything from 100% white to 100% of any color including black. That's why printers talk about DPI (dots per inch) instead of PPI (pixels per inch) and printing full 24-bit RGB color at 300 PPI requires a printer with 2400 DPI of CYMK dots.
Modern-day high-end inkjet printers are bit more complex. Some can create dots of a couple of different sizes and include added inks (lighter versions of C, Y, M, and sometimes K). The result is that maybe a 4-dot by 4-dot square can produce the full gamut of colors and shades so that a 1200 DPI printer can create good 300 PPI prints.
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Forum: Mini-Challenges, Games, and Photo Stories
01-12-2021, 05:49 PM
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Bronica Adaaptor for GFX arrived ...no patience to try in nice light so went and shot high iso scene on dog walk. Noir Nights by Eddie Smith, on Flickr
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Forum: Mini-Challenges, Games, and Photo Stories
01-06-2021, 05:14 PM
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Took this on an early morning hike today, Went light, 15 and 300 with TC. This one with the 300+, it begged for B&W. The Foggy Forest by Tom Ramsey, on Flickr
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Forum: Mini-Challenges, Games, and Photo Stories
01-03-2021, 04:31 PM
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Originally done as colour with lots of foreground but I saw this crop later on and had to go back and do a black and white. The view towards Kinder Scout from Lyme Park. Mountains by Graeme Sugden, on Flickr
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Forum: Mini-Challenges, Games, and Photo Stories
01-03-2021, 10:03 AM
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This is another natural B&W where colour had nothing to contribute - K-1 with 77Ltd window by Graham Hobbs, on Flickr
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Forum: Mini-Challenges, Games, and Photo Stories
01-02-2021, 01:21 PM
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Cherry Beach Lifeguard Station , GFX50R with GF50MMf3.5 shot in eterna and post in Silver Efex , DSCF0552-Edit.jpg by Eddie Smith, on Flickr
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Forum: General Talk
01-04-2021, 06:37 AM
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Just some random stuff ...
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Forum: Mini-Challenges, Games, and Photo Stories
12-21-2020, 01:59 PM
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I'll assume you are referring to my image, and I'll thank you on behalf of any other Robs who might be posting bird images ;)
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Forum: Product Suggestions and Feedback
12-21-2020, 01:15 PM
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If Pentax makes a 43 Ltd as well as the 40 Da Ltd and the 40 DA Xs I don't see how a DA28 Ltd would affect sales of the FA31. For one thing look at the price difference between the FA and DA limiteds.
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Forum: Product Suggestions and Feedback
12-21-2020, 08:23 AM
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It's not just a matter of coverage but of what the limiteds typically represent, apertures typically wider than zooms, better IQ, compact build. The FA 31mm limited is a great lens, but it is in many ways wasted on the aps-c sensor and bigger than the DA ltds, hence my suggestion.
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