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Showing results 1 to 25 of 185 Search: Liked Posts
Forum: Pentax SLR Lens Discussion 01-25-2022, 10:42 AM  
Pentax 94mm f/1.8?
Posted By Pond-Curtis
Replies: 16
Views: 1,389
This site https://www.photonstophotos.net/GeneralTopics/Lenses/OpticalBench/OpticalBench.htm has a schematic for a "Pentax 94mm 1.8" but I haven't find any info. Maybe it's just from a patent? Regardless, the design interests me and I'd appreciate any info.
Forum: General Talk 11-30-2021, 09:02 PM  
The Joke Thread
Posted By luftfluss
Replies: 5,874
Views: 491,426
Until Yngwie Malmsteen shows up, and then those 10 or 20 will claim they will do it slower and with more soul? :lol:
Forum: Pentax SLR Lens Discussion 09-03-2021, 08:05 AM  
Rokinon??
Posted By Bob 256
Replies: 11
Views: 884
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.
Forum: Film SLRs and Compact Film Cameras 06-28-2021, 05:22 AM  
Takumar - wiki page
Posted By titrisol
Replies: 20
Views: 1,471
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
Forum: Photographic Technique 06-23-2021, 05:58 AM  
How many megapixels do you need (rant)?
Posted By photoptimist
Replies: 64
Views: 4,196
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.
Forum: Mini-Challenges, Games, and Photo Stories 01-17-2021, 11:42 AM  
Just Black and White-ur B/W Monochrome photos here
Posted By paulh
Replies: 30,192
Views: 2,090,394
American Airlines Museum in Ft. Worth TX, Jan 2015. Vivitar 19/3.8 on *ist D:
holding pattern by Paul Hensley, on Flickr
Forum: Mini-Challenges, Games, and Photo Stories 01-08-2021, 05:49 PM  
Just Black and White-ur B/W Monochrome photos here
Posted By pepperberry farm
Replies: 30,192
Views: 2,090,394
chairs by Pepperberry Farm, on Flickr
Forum: Mini-Challenges, Games, and Photo Stories 01-12-2021, 06:17 PM  
Just Black and White-ur B/W Monochrome photos here
Posted By Riggomatic
Replies: 30,192
Views: 2,090,394
Helical gear

SMC-K 28mm f3.5
IMGP1267 by riggomatic, on Flickr
Forum: Mini-Challenges, Games, and Photo Stories 01-12-2021, 06:10 PM  
Just Black and White-ur B/W Monochrome photos here
Posted By steamloco76
Replies: 30,192
Views: 2,090,394
Q-7 with 06 Zoom
Forum: Mini-Challenges, Games, and Photo Stories 01-12-2021, 05:49 PM  
Just Black and White-ur B/W Monochrome photos here
Posted By eddie1960
Replies: 30,192
Views: 2,090,394
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
Forum: Mini-Challenges, Games, and Photo Stories 01-06-2021, 05:14 PM  
Just Black and White-ur B/W Monochrome photos here
Posted By ramseybuckeye
Replies: 30,192
Views: 2,090,394
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
Forum: Mini-Challenges, Games, and Photo Stories 01-06-2021, 02:54 AM  
Just Black and White-ur B/W Monochrome photos here
Posted By Jan178
Replies: 30,192
Views: 2,090,394
benches on the beach

SMC 50mm f/2 on *istD

[IMG]benches on the beach by Jani Fofonoff, on Flickr[/IMG]
Forum: Mini-Challenges, Games, and Photo Stories 01-04-2021, 12:11 PM  
Just Black and White-ur B/W Monochrome photos here
Posted By Hattifnatt
Replies: 30,192
Views: 2,090,394
Trying long exposure portraits with a friend.

Wraith by Hattifnattar, on Flickr
Forum: Mini-Challenges, Games, and Photo Stories 01-03-2021, 04:31 PM  
Just Black and White-ur B/W Monochrome photos here
Posted By graeme83
Replies: 30,192
Views: 2,090,394
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
Forum: Mini-Challenges, Games, and Photo Stories 01-03-2021, 10:03 AM  
Just Black and White-ur B/W Monochrome photos here
Posted By ffking
Replies: 30,192
Views: 2,090,394
This is another natural B&W where colour had nothing to contribute - K-1 with 77Ltd

window by Graham Hobbs, on Flickr
Forum: Mini-Challenges, Games, and Photo Stories 01-02-2021, 10:16 PM  
Just Black and White-ur B/W Monochrome photos here
Posted By pepperberry farm
Replies: 30,192
Views: 2,090,394
Forum: Mini-Challenges, Games, and Photo Stories 01-02-2021, 01:21 PM  
Just Black and White-ur B/W Monochrome photos here
Posted By eddie1960
Replies: 30,192
Views: 2,090,394
Cherry Beach Lifeguard Station , GFX50R with GF50MMf3.5 shot in eterna and post in Silver Efex ,

DSCF0552-Edit.jpg by Eddie Smith, on Flickr
Forum: General Talk 01-04-2021, 06:37 AM  
The Joke Thread
Posted By Jean Poitiers
Replies: 5,874
Views: 491,426
Just some random stuff ...
Forum: Mini-Challenges, Games, and Photo Stories 12-26-2020, 05:52 AM  
Just Black and White-ur B/W Monochrome photos here
Posted By aslyfox
Replies: 30,192
Views: 2,090,394
stripes
Forum: Mini-Challenges, Games, and Photo Stories 12-25-2020, 06:18 AM  
Just Black and White-ur B/W Monochrome photos here
Posted By pepperberry farm
Replies: 30,192
Views: 2,090,394
cabrio by Pepperberry Farm, on Flickr
Forum: Mini-Challenges, Games, and Photo Stories 12-25-2020, 06:17 AM  
Just Black and White-ur B/W Monochrome photos here
Posted By pepperberry farm
Replies: 30,192
Views: 2,090,394
billiards by Pepperberry Farm, on Flickr
Forum: Mini-Challenges, Games, and Photo Stories 12-21-2020, 01:59 PM  
Just Black and White-ur B/W Monochrome photos here
Posted By robgski
Replies: 30,192
Views: 2,090,394
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 ;)
Forum: Product Suggestions and Feedback 12-21-2020, 01:15 PM  
28mm Limited for APS-c?
Posted By redrockcoulee
Replies: 92
Views: 5,973
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.
Forum: Product Suggestions and Feedback 12-21-2020, 08:23 AM  
28mm Limited for APS-c?
Posted By someasiancameraguy
Replies: 92
Views: 5,973
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.
Forum: Mini-Challenges, Games, and Photo Stories 12-20-2020, 05:04 PM  
Just Black and White-ur B/W Monochrome photos here
Posted By robgski
Replies: 30,192
Views: 2,090,394
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