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Forum: Film Processing, Scanning, and Darkroom 06-13-2018, 11:30 AM  
What is wrong with this films
Posted By aremmes
Replies: 13
Views: 1,430
The first picture looks underexposed but otherwise OK, and the last one looks fine. The middle picture looks like bad parameter input during scanning, but should be fixable by adjusting the green channel gamma down a bit to balance things out.

Others will have better insight on this.
Forum: Pentax SLR Lens Discussion 06-08-2018, 01:15 PM  
Tamron 28-75 lost aperture communication
Posted By aremmes
Replies: 10
Views: 887
Perhaps the auto-aperture pin (that extends when the aperture ring is set to A) doesn't extend as it should? It's the only thing that I can think of, since Pentax lenses do not communicate the selected aperture electronically.
Forum: Pentax Film SLR Discussion 04-25-2018, 07:47 AM  
Pentax Super A/Super Program camera strap and shutter sound
Posted By aremmes
Replies: 14
Views: 1,138
A Program Plus (nee Program A) that I saw one day at a thrift store (and regret not buying for fear of getting complaints from SWMBO about yet another camera) had a bright red strap about 1" (2.54cm) wide, with the white PENTAX logo embroidered on it. Meanwhile, the A30 I have came with a black strap with red Pentax logo. Perhaps Asahi sold different styles of straps back then.
Forum: Troubleshooting and Beginner Help 08-12-2017, 07:43 AM  
Tripod Socket Size Pentax K5
Posted By aremmes
Replies: 8
Views: 1,447
It indeed is 1/4" 20 tpi. There's an international standard, ISO 1222:2010, that defines that size and the larger 3/8" 16 tpi for larger cameras.
Forum: Repairs and Warranty Service 07-12-2017, 08:33 AM  
Aperture Motor Failure on K-50
Posted By aremmes
Replies: 10
Views: 3,092
I'm a K-50 owner lucky enough to not have experienced the aperture motor failure yet. While you kept your K-50 in storage, did you leave it with a lens mounted on it? I wonder this because I almost always remove the lens before storing it, and perhaps the pressure of holding the aperture open when a lens is mounted accelerates the deterioration of the motor and I've dodged that by not storing the camera with a lens mounted on it.
Forum: Pentax K-1 06-28-2017, 12:27 PM  
K-1 switching from DNG to PEF
Posted By aremmes
Replies: 13
Views: 2,505
You mean DNG, right? PNG is different, a lossless bitmap image format developed as an alternative to GIF back when Unisys demanded patent royalties for the LZW compression algorithm.
Forum: Pentax SLR Lens Discussion 06-23-2017, 07:01 PM  
Some thoughts about Ks, Ms, and As.
Posted By aremmes
Replies: 23
Views: 1,813
It should be noted that while the aperture ring on an A lens allows one to change the aperture only in half-stop increments, while a DSLR can adjust it by thirds as well -- or whatever the firmware chooses, really -- giving another benefit to controlling the aperture through the camera's controls.
Forum: Pentax Film SLR Discussion 06-07-2017, 10:09 AM  
You May Only Keep One
Posted By aremmes
Replies: 83
Views: 5,718
Super Program and A35-105.
Forum: Pentax Medium Format 05-31-2017, 08:20 AM  
Pentax 6x7 ..what am I looking at?
Posted By aremmes
Replies: 15
Views: 4,257
This is not an accident. With the waist-level finder you only have a hood that surrounds the focus screen -- either way you end up looking at the focus screen directly.
Forum: Pentax Medium Format 05-30-2017, 12:20 PM  
Pentax 6x7 ..what am I looking at?
Posted By aremmes
Replies: 15
Views: 4,257
That's what it looks like with the view finder removed. See also the Wikipedia article about waist-level finders.

Forum: Non-Pentax Cameras: Canon, Nikon, etc. 05-19-2017, 08:54 PM  
Leica adapter
Posted By aremmes
Replies: 1
Views: 531
Linking the cams thru the adapter would serve no purpose on Pentax DSLRs, as they do not read that information from the lens. Instead, they set the aperture directly by controlling the distance traveled by the aperture lever. The equivalent to the lens cams in Pentax cameras is the stop-down coupler, which only existed on film bodies.
Forum: Pentax Price Watch 05-18-2017, 05:45 PM  
FA 50mm F1.4 - record low price
Posted By aremmes
Replies: 5
Views: 1,664
That's pretty good. For reference, the DA50/1.8 used to cost that much.
Forum: Troubleshooting and Beginner Help 04-04-2017, 07:21 AM  
Enough!
Posted By aremmes
Replies: 23
Views: 2,237
Maybe call your credit card company and tell them that you believe your credit card number has been compromised and you need a new one issued.
Forum: Travel, Events, and Groups 03-26-2017, 03:26 PM  
Trip suggestions eastern USA, CT to GA
Posted By aremmes
Replies: 8
Views: 941
If you follow the shore, you could stop by the Pine Barrens in New Jersey, cross the Delaware Bay on the Cape May-Lewes Ferry, visit Assateague Island, drive through the lower Delmarva Peninsula, cross the Chesapeake Bay Bridge-Tunnel, and either go straight to the upper Outer Banks or take US-13 south to Morehead City, NC, the Croatan National Forest, and Cape Lookout. That could easily eat up a week and would still get you no further south than North Carolina.
Forum: Digital Processing, Software, and Printing 03-23-2017, 09:52 AM  
What is Jpeg Quality ?
Posted By aremmes
Replies: 15
Views: 2,063
Look at boriscleto's screenshots above, they clearly show an option for subsampling. Also, from the Wikipedia page:
Forum: Digital Processing, Software, and Printing 03-22-2017, 06:50 PM  
What is Jpeg Quality ?
Posted By aremmes
Replies: 15
Views: 2,063
"422" relates to color compression. In JPEG the image data is first converted from RGB to YCbCr. From there it then reduces the chroma resolution according to the user's choice in a process known as chroma subsampling: 4:4:4 means that it has the same resolution as the luminance channel and therefore uncompressed, while 4:2:2 indicates that chroma has half the resolution of luminance. This takes into account the fact that humans perceive chroma changes less well than luminance changes.
Forum: Troubleshooting and Beginner Help 03-18-2017, 01:54 PM  
Pentax KS-2 White Balance adjustment with Expodisc
Posted By aremmes
Replies: 2
Views: 679
Easy enough. Put disc on, set camera to AWB, pattern metering, program exposure, manual focus. Focus the lens to infinity, aim at the light source, and shoot. The captured image will contain the white balance reading of your light source, which you can save to a manual WB setting from the preview display.
Forum: Pentax DSLR Discussion 03-17-2017, 02:15 PM  
K-1 asking for focal length input w/ Rokinon 14mm lens
Posted By aremmes
Replies: 21
Views: 2,315
The distances that the sensor has to move to compensate for camera movement are proportional to the focal length -- longer lens, longer sensor movement distances.

Setting the focal length to a zoom lens's maximum results in SR overcompensation for any length shorter than the maximum, resulting in blurry images. From what I've read here on these forums, people usually choose one of three methods: set to midpoint, set to minimum, or disable SR. it all depends on how you choose to use the lens.
Forum: Pentax DSLR Discussion 03-17-2017, 07:11 AM  
K-1 asking for focal length input w/ Rokinon 14mm lens
Posted By aremmes
Replies: 21
Views: 2,315
Quite normal. KA-mount lenses don't indicate focal length to the camera. Shake reduction depends on the current focal length to compute movement compensation.
Forum: Pentax SLR Lens Discussion 03-04-2017, 09:40 PM  
What does the lens transmit to the body re: shutter speed?
Posted By aremmes
Replies: 9
Views: 864
Lenses in the FA and newer series transmit MTF data, informing the camera about characteristics related to resolution and contrast among other things. The camera can then adjust exposure parameters to maximize resolution given the available light. Without the MTF data, the camera defaults to exposing to middle gray in the selected metering mode.
Forum: Pentax News and Rumors 02-20-2017, 09:05 PM  
Pentax History Posters in pdf format
Posted By aremmes
Replies: 40
Views: 6,717
The "S" is for "sucks".
Forum: Pentax News and Rumors 02-19-2017, 08:18 PM  
Pentax History Posters in pdf format
Posted By aremmes
Replies: 40
Views: 6,717


SX7?!?
Forum: Pentax K-30 & K-50 02-13-2017, 01:08 PM  
Pentax K-50 /K-30 Stuck Shutter
Posted By aremmes
Replies: 10
Views: 3,395
Does the camera work in live view? If it doesn't, did the shutter control board get disconnected when you repaired the aperture control motor?
Forum: Pentax Q 02-13-2017, 09:21 AM  
Banding with Q-S1 ?
Posted By aremmes
Replies: 7
Views: 1,020
You'll get the same effect seen on YouTube videos taken with GoPros of propeller-driven aircraft, where the blades seem to either not move, bend, or detach from the hub depending on perspective and prop speed.
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 02-07-2017, 08:52 AM  
Potential Aha moment
Posted By aremmes
Replies: 5
Views: 831
I was perhaps 10 years old when I first saw an F3. I could not describe it back then, but in hindsight I'd say that I felt something akin to "the future is now." I didn't have a clue what all the bits and bobs were meant to do but I didn't care, it still looked more impressive than Mom's Polaroid even though the latter ran on magical pixie dust.
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