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Forum: Photo Critique 7 Hours Ago  
Night Out of Focus - Blood Moon
Posted By photoptimist
Replies: 14
Views: 231
At 600mm, the 3.9 micron pixels of the K-3 sensor subtend about 6.5 microradians. The moon (and stars) move about 72 microradians per second. During a 2 second exposure time, the moon would move about 22 pixels.

If the blur is about 22 pixels wide, than that's culprit.
Forum: General Photography 8 Hours Ago  
Inspiration through Culling and Curating
Posted By photoptimist
Replies: 8
Views: 214
Proud digital packrat here! With the low price of digital storage, I happily hoard everything.

The notion of reviewing past work seems very valuable for all the reasons mentioned. But deletion and forgetting each ugly bit of personal photographic history seems counterproductive. Keeping everything lets one relive both the glories and the mistakes multiple times which helps reinforce the lesson.

That said, the best of the best get special treatment. The better of the rest get some tagging. And the rest sit on the hard disk as a homage to both humble beginnings, honest mistakes, failed experiments, and more recent blunders.

(Plus, I never know when some automagical AI might be able to fix that blurry, underexposed JPG which my nose set to a white balance of 20,000K.)
Forum: Photographic Industry and Professionals 1 Day Ago  
Netherlands: Photojournalists on strike to demand decent rates
Posted By photoptimist
Replies: 21
Views: 739
A peer-to-peer (or beer-to-beer) grading system would certainly offer a stout boost to ale-ing grades. Who needs a good head on the shoulders when there's a good head on the pint?

"Better GPA through IPA!" ;)
Forum: General Talk 1 Day Ago  
Your latest acquisition
Posted By photoptimist
Replies: 15,165
Views: 1,014,524
Nice P&S. My wife had one of those and absolutely loved it. In fact, it was the last camera that she actually liked and has complained bitterly that every camera since the Hi-Matic was worse.

The Hi-Matic had instant AF -- you pushed the shutter button and it took a focused picture with seemingly zero-lag.
Forum: Pentax DSLR Discussion 1 Day Ago  
Extremely low temperatures : What to expect and how to counter-balance it?
Posted By photoptimist
Replies: 52
Views: 1,227
The battery does not discharge in the cold so much as grow less able to put out enough power to run the camera. The camera interprets this weakness as discharge but it's not. A very cold fully-charged battery is still fully charged even if it is too weak from cold to run the camera. Warm the battery back up and the charge will still be in there.

Insulating the camera can help slow how quickly the battery becomes too cold to power the camera. Hardcore low-temperature photographers create larger insulated battery packs to handle the cold and sometimes add hand warmers in the battery box. If you have a power supply, that will solve the cold-battery problem.
Forum: Pentax News and Rumors 1 Day Ago  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By photoptimist
Replies: 817
Views: 34,994
Agreed! My original comment only refuted the idea that big cameras would go extinct. That logic was not meant to argue that small cameras would go extinct. That said, "advanced" and "pro" model cameras will be bigger than entry-level models both for ergonomic and prestige reasons.

Overall, too many people look at trends or their own preferences and then over-extrapolate in declaring that certain designs must dominate and all other designs must go extinct. Personally, I think big and small cameras will coexist as will both DSLR and MILCs along with a range of sensor sizes. The smallest and the largest camera designs will be niche models and systems. Statistics, physics, ergonomics, and economics would seem to imply that most cameras will be medium sized and moderately priced.

Looking longer term, I'm also wondering what will happen when the Chinese start building ILCs. My amateur reading of the Japanese culture is that it loves miniaturization and that drives the development of smaller cameras. In contrast, the Chinese culture seems less focused on small products and more focused on prestige.
Forum: Pentax News and Rumors 2 Days Ago  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By photoptimist
Replies: 817
Views: 34,994
If a camera is going to offer lots of dedicated controls for various settings, modes, etc., then the body needs to be big enough to easily access those controls without confusion. The physical size of the human hand (and natural variation there-of) pretty much make cameras the size of the K-1, and pro Canikons just about optimal for many people with normal to large hands.

I used to carry an OM-4TI which was nice and light but the K-1 is better. I've gotten quite used to hand-carrying the K-1 for an entire day's hike or city-ramble. Sure, somewhat lighter might be nice, but not that the expensive of either functionality (the very nice array of decent-sized buttons and dials) or robustness (a good solid body).
Forum: Pentax News and Rumors 2 Days Ago  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By photoptimist
Replies: 817
Views: 34,994
First, congratulations on raising a sensible daughter!

Second, too many things in this world are under the influence of less-sensible people -- squeaky wheels and big bridezillas getting all the grease, etc. Too many buying decisions are driven by fear. I wonder how many pro photogs go with the biggest brands of biggest cameras simply because they think (or fear) customers will be uncomfortable with an unorthodox choice.
Forum: Pentax News and Rumors 2 Days Ago  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By photoptimist
Replies: 817
Views: 34,994
This seems entirely false on a very deep level.

There's clearly a subset of customers that trend the opposite way. They think bigger bodies are better, bigger lenses are better, and bigger bags are better.

Does Mr Showoff pick the light little travel camera with it's superzoom or buy a giant beast, multi-kilogram birding lens, and huge carbon fiber tripod with gimbal? With today's high-performance sensors and lenses, small equipment works amazingly well at getting the shot. But that's not the reason Mr Showoff bought a camera. He bought a big cameras and big lenses because they scream $$$$$.

Does bridezilla pick the photographer with the dainty MILC, one small zoom, and a tiny bag or does she pick the photographer with the big honking DSLR or MF body and a foot locker-size Halliburton case of big primes, big strobes, big softboxes etc.?

And even if these folks are a minority, they end up defining what non-photographers think is a "serious" camera and influencing what non-photographers by when they decide to become photographers.
Forum: Pentax Full Frame 3 Days Ago  
K1 over exposing shots
Posted By photoptimist
Replies: 8
Views: 456
Three possibilities:

1) Sticky lens aperture: If the lens aperture mechanism is sticky, the aperture won't close down in time and be over exposed. DoF will be shallower than expected, too. But if it's happening with multiple lenses, it's not likely.

2) Loose exposure sensor: If the exposure meter sensor (located in the pentaprism) becomes dislodged, the sensor will see darkness and give long shutter/wide aperture/high ISO exposures compared to the live view exposure reading. Comparing exposure readings in normal and live view.

3) Dirty mount/lens contacts: dirty contacts cause the camera to mis-interpret the maximum aperture of the lens which affects how it computes exposure.
Forum: Pentax K-1 4 Days Ago  
Post your K-1 pictures!
Posted By photoptimist
Replies: 22,427
Views: 1,867,327
Vignetting can be a very useful. A bit of vignetting helps reinforce the centrality of the primary subject, enclose it in its own little universe, invoke a nostalgic memory that is fuzzy/dark at the edges, and perhaps even add a hint of voyeurism.

On the other hand, it can harm some types of images that seek to create a more open or boundless feeling. For example, with a landscape, you might want to convey a sense that the forest, mountains, clouds, etc. extend on forever out of the frame. Enclosing such a scene would make it seem smaller and less grand. Or if the focal person in the image is looking out of the frame, a vignette would tend to break their gaze.

Like every method or rule in photography, vignetting has it's uses but can be easily over used.

P.S. I do really like the vignetting for northcoastgreg's image in reinforcing the loneliness of the derelict ship and bring forth the notion of old memories of it's past service on the seas.
Forum: Troubleshooting and Beginner Help 4 Days Ago  
Is it my imagination that photo files loose sharpness going from camera to computer?
Posted By photoptimist
Replies: 14
Views: 814
Try checking the settings and playing with them. It's quite possible that the camera is set to auto-magically sharpen the images and the computer is not.
Forum: Pentax SLR Lens Discussion 4 Days Ago  
Macro Lenses Suggestions
Posted By photoptimist
Replies: 54
Views: 1,415
As tryphon4 said, it's important to know that the minimum focus distance (MFD) is NOT the working distance. The MFD (like all distances marked on the lens barrel) is the distance from the sensor to the subject. The working distance (lens-front-to-subject) is a lot shorter.

For the Pentax 35 macro, the MFD may be 5.5" inches but the working distance at 1:1 is only a little more than 1" which makes lighting really hard and scares off everything besides flowers and mushrooms.

For the DFA 100/2.8 macro, the working distance is over 5" (the MFD is about 12") which gives a lot more room for lighting and is less likely to send tiny legs scurrying.
Forum: Pentax K-1 4 Days Ago  
Post your K-1 pictures!
Posted By photoptimist
Replies: 22,427
Views: 1,867,327
Excellent composition!

That dog certainly knows he deserves attention from the pup-arazzi.;)
Forum: Pentax News and Rumors 4 Days Ago  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By photoptimist
Replies: 817
Views: 34,994
Asking what size camera photographers generally prefer is like asking what size shoe people generally prefer. They want cameras and shoes fit their bodies and their intended uses! Some people want a size 2 sandal and others want a size 13 winter hiking boot. And given that Pentax generally focuses on high-quality, rugged, WR cameras with full-featured controls, Pentax cameras are likely to be a little bit bigger and heavier than the entry-level plastic pentamirror econo-cameras.

As for mirrorless, only a quarter of Pentaxians think Pentax should develop an FF MILC (2018 Pentax K-mount DSLR User Survey - Photo Industry News | PentaxForums.com). Most Pentaxians want DSLRs and both the recent CIPA stats and Amazon best-seller lists show that most camera buyers still want DSLRs.
Forum: Pentax News and Rumors 6 Days Ago  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By photoptimist
Replies: 817
Views: 34,994
Color me skeptical.

Sure, some models and some inventories might get discounted, but on-average, the retailer's average selling prices must be higher than the maker's average shipping prices or the retailer will soon die.

And if you are suggesting that camera makers are fudging their shipping prices (claiming they shipped a $5,000 camera knowing it will get discounted to $2,000 and that the retailer will only pay a fraction of the $2,000), then neither the low average prices of yesteryear nor the high average prices of today have any meaning. The entire curve could only reflect changes in fictional prices that have little to do actual average sales prices.

Moreover, I've not heard of any shortages of cheap the Canon T6 Rebels. They are the best selling ILCs on Amazon which would be impossible if Canon were cutting off the low-end tail. If anything, it's the higher-end newly launched cameras that seem to be in short supply because consumers have moved up-market faster than camera makers have.
Forum: Pentax News and Rumors 6 Days Ago  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By photoptimist
Replies: 817
Views: 34,994
This data says just as much (or more) about consumers moving upmarket. An average price won't go up if consumers keep buying products that are priced below average (and, by mathematical necessity, there must always be some products at a below-average price point). Similarly, even if camera makers put out ever more expensive cameras, the average price won't change unless consumers move upmarket, too, and buy the high-end.

It's ILC consumers that have moved upmarket and the makers have followed. Or, more likely, many of the downmarket ILC buyers have disappeared. The low-end ILCs don't offer enough of a performance/feature boost over everyone's smartphone to justify buying.
Forum: Photographic Technique 6 Days Ago  
The "everything but gear talk" thread. What's your project, what's your take on it?
Posted By photoptimist
Replies: 165
Views: 10,008
Me too (although the weather at the moment looks bad).

If the weather improves, I'd thought about doing a very long interval composite with a Samyang 14/2.8 fixed in portrait orientation to have a view of the horizon at the lower edge. I'd start the series maybe an hour before the start of the penumbral eclipse, take a shot every 3 minutes, and end the series an hour after the end of the penumbral eclipse. That would create about a 7-hour series with a 140 shots.

In theory, the moon would be string of 25 pixel disks with maybe 10-12 pixels of dark space between shots. The moon dots would be like a string of pearls that go from bright, to red, to bright across the span the frame. The tricky bit is the exposure -- I might just keep it simple (expose for the brightest stars and let the uneclipsed moon blow out) or muck around with bracketing which would mean collecting a lot of images.
Forum: Pentax SLR Lens Discussion 6 Days Ago  
APSC Portrait Lens info
Posted By photoptimist
Replies: 34
Views: 1,260
That sounds about right.

The only issue is that when you say "distortion," you might be talking about two different issues. Some lenses do have an intrinsic distortion. They distort straight lines into curved lines. That makes buildings, windows, and other rectangular objects look like inflated barrels or pinched-in pin-cushions. That type of distortion is a property of the lens that independent of the sensor format (although barrel or pincushion distortion is less obvious on a crop sensor). Note that some zooms have barrel distortion at the wide end and pin cushion at the long end.

But if you are talking about "distortion" of facial features from using different lenses, then that is only a matter of lens-to-subject distance, not focal length. Stand 10 feet from the person and photograph them with an ultrawide angle lens and you'll find that their face in the center of the picture does not show any "wide angle" distortion. Stand 1 foot from a person's nose and photograph them with a 200 mm telephoto and their nose will become a bulbous protuberance in front of an overly-rounded head.

Thus, you want to first set the distance to the subject to set the look of the shape of the face and then pick a focal length that creates the width/height of frame width you want around the face/torso/body.
Forum: Post Your Photos! 01-15-2019, 07:25 PM  
Misc For Nerds Only
Posted By photoptimist
Replies: 8
Views: 330
And it gets even more challenging if one thinks about the gravity field of Andromeda (which seems to be of similar mass to the Milky Way). Our Sun (and the Earth and all the Solar System) for example are whizzing around the Milky Way at some 500,000 miles per hour just to stay in orbit. So that intrepid astronaut may need a lot more velocity than 25,000 mph to avoid being dragged back into the black hole at the center of Andromeda.
Forum: Pentax News and Rumors 01-15-2019, 05:21 PM  
Nippon Camera Ricoh/Pentax 2019 Interview
Posted By photoptimist
Replies: 817
Views: 34,994
It seems many people were convinced that MILC would kill DSLRs once Canon and Nikon joined the MILC wagon. So what does the jury tell us so far?. The sales and production figures for November 2018 (which should surely show the MILC launch peak for Aug/Sept/Oct launches of the new cameras) still show DSLRs had 28% more units made and 38% more units shipped than did MILCs. Even with Canon, Nikon, Sony, Fuji, Olympus, Panasonic, and Leica now all offering MILCs, DSLRs still beat them.

MILC may have dominated the internet chatter stream, but that noise was not reflected (HA! ;) ) in the actual sales figures.
Forum: Pentax SLR Lens Discussion 01-15-2019, 10:01 AM  
Filters
Posted By photoptimist
Replies: 10
Views: 714
This problem may be more common than most people realize. A filter might be protecting your lens but ruining your images.

Just as someone might check a new lens for sharpness, decentering, flare, etc. filters need careful checking because they can degrade sharpness, flare, and bokeh.
Forum: Photographic Industry and Professionals 01-15-2019, 08:28 AM  
Netherlands: Photojournalists on strike to demand decent rates
Posted By photoptimist
Replies: 21
Views: 739
I wish them luck but the current economics of news media are not on their side.

Maybe the photojournalists can force publishers to pay more but the publishers can't force online readers to pay more.

Many traditional and new media outlets are going bankrupt because news is "free" on the internet and not generating enough revenue to cover the costs of writing, shooting, editing, and publishing the news.
Forum: Pentax K-3 01-15-2019, 08:20 AM  
K-3 BULB MODE issues on Firmware V1.11 V1.20 V1.40
Posted By photoptimist
Replies: 8
Views: 400
Have you tried hitting and releasing the IR remote button quickly?

AFAIK, IR Remotes send a stream of "Button-down" pulses if you hold the button down for more than a fraction of a second.
Forum: General Photography 01-14-2019, 07:06 PM  
Keep your Lens Dusted
Posted By photoptimist
Replies: 8
Views: 908
Given that the average smartphone these days would have been considered a supercomputer not that long ago, analysis requiring a supercomputer might be cheaper than one thinks. Even a measly Intel Core i5 can do 70 billion single-precision math operations per second, That's more than enough to do a quickie cross-correlation of the pixel-to-pixel brightness differences on a couple of digital camera images in a fraction of a second to see if the two images probably came from the same sensor because they have similar patterns of pixel-to-pixel sensitivity variations.

That quickie analysis doesn't have to be exact or perfect to suit Facebook's application. Even if they only catch a fraction of the missing connections between people, they still know more than they did about who knows whom and who does what with whom.
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