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Forum: Post Your Photos!
19 Hours Ago
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We have a decent enough area here people would like if they just got rid of the nature. 75% have head phones. I pointed out a bald eagle to people today and they couldn't be bothered. I pointed out a hawk with a squirrel in the nature area and several people commented and even laughed about dead squirrels are good. Most yell and scare everything away. We have a rare pileated woodpecker that is loud and no one bothers to look. When you get 100 seconds without car noise there are many kinds of small birds you can hear and locate.
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Forum: Non-Pentax Cameras: Canon, Nikon, etc.
1 Day Ago
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absolutely adorable!
I have 3 squirrels I have connected with. This is Bolelyn. Her nose was frostbit during the polar vortex. I assume she had been out when either the hawk or eagle was hunting and had to stay motionless for a long period. Another one had what I assume was a near escape from one because of the huge hole in its haunch that has recently healed. I came upon the lower half of a squirrel today and saw a hawk kill a red squirrel 2 days ago, I often wondered why they chose to live so close to a path where many bring their unleashed dogs but the dogs are easy to escape and keep the other predators mostly away. The park transistions from pure lawn to wild over about a mile. This part is tree cover but mowed area, the birds of prey stay mostly to the full woods on the edge of the golf course.
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Forum: Photographic Technique
1 Day Ago
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I actually find Cartier-Bresson's subject very sharp. His subject is often the space, negative space and that is very sharp. When his subject is a person, the person is sharp.
Others who want negative space as the subject almost always keep it out of focus with the exception of constructed very geometrical shapes like buildings.
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Forum: Photographic Technique
2 Days Ago
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I have 3 razor sharp lenses. I never seek them out for their sharpness. One for its macro ability where I use it at f/16-18 where it has lost most of its sharpness, one for it's low light and bokeh ability, and one for its lack of distortion. I often choose less sharp lenses for their strengths. I do choose by sharp enough. I only use my 18-50 in bad weather. In fog and rain it is sharp enough and wr.
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Forum: Pentax DSLR Discussion
2 Days Ago
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If a k-70 truly is ideal then get one manufactered after 2015. The soleinoid in only the early models is the same as the k50. In Dec. 2015 they were changed. I assume there is a target seial number where any higher will be after this time.
As you learn more about the kp you may decide it is more ideal of course.
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Forum: Pentax KP
4 Days Ago
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That is all. If the camera starts the 55-300 plm should work. I believe the plm came out at the same time as the k70 so any camera after like the kp is good. Any camera before would need the firmware installed as it didn't know about a plm lens before it was invented. And a camera before the k50 is to old for firmware unless tricked to feel as young as a k50.
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Forum: Pentax K-30 & K-50
4 Days Ago
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Forum: Pentax K-30 & K-50
5 Days Ago
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My ks-2 failed over a month ago. I still haven't fixed it because it hasn't bothered me. I have lenses that let me set aperture with the aperture ring. If you are planning on buying lenses get some of the great older ones. They can be found quite cheap.
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Forum: Pentax K-1
6 Days Ago
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Was the k1 in cropmode? I wonder if what the sensor is seeing has any influence. Also wondering how the results changed from first test to second test. I would want to see each camera tested at least 3 times to see how consistent the results are. Then 3 more with slight camera repositioning to make sure it isn't some weird reflections or bounce.
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Forum: Photographic Technique
6 Days Ago
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I had misunderstood you. I read "subject" for "concept".
The photo shows what you meant.
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Forum: General Photography
02-22-2021, 09:34 PM
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Looking at the gif we see all the interesting stuff has nothing to do with equivalence.
How does the 's' in 'cows' appear from behind the model?
At the bottom half of the photo you see a 3d of the model become 3d vs flat. That deals with the sine/cosine function of the angle looking down(perpendicular) vs looking across ( parallel) to the object. IE, look straight at the edge of a board and you see the edge, look down and you see the top.
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Forum: Pentax SLR Lens Discussion
02-22-2021, 08:00 PM
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Or perhaps the opposite.
[PENTAX STATEMENT (5 determinations for us to be us]
・ I like photography, so I build a camera.
・ Ideal for a camera that can take pictures in a dialogue.
・ We are particular about cameras that allow you to enjoy the shooting process.
・ Challenge areas that cannot be measured numerically.
-Use the user’s “photo experience” as an asset.
Only Pentax user's have experience to shoot bird's in flight. Everyone else buys a robot to shoot for them.
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Forum: Troubleshooting and Beginner Help
02-22-2021, 06:29 PM
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Just checked mine. If I move 1 minute every second as a clock it is fine. Even slower with smaller increments is pretty smooth. I can't really imagine that critical of focus being much smoother without giving the lens a longer focus throw which is 120°
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Forum: Pentax K-70
02-22-2021, 06:16 PM
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Stevebrot sounds like a "best" solution. If you are using 1/160 instead of 1/180 you are set to use 1/3 aperture stops and not 1/2. I is nice to know for killing more ambient light in some cases.
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Forum: Photographic Technique
02-22-2021, 05:51 PM
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More nuanced:
A sharp image of a fuzzy object that includes the surrounding allows us to know the object is indeed fuzzy. Yet a photo without any surrounding reference will fail to inform us the object is fuzzy and not the photo.
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Forum: Photographic Technique
02-22-2021, 03:52 PM
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I think the photo would benefit from sharpness but not the painting. The frame is so unsharp it looks like the painting. Which brings up the philosophical question of when sharpness matters. Here it matters because it has the ability to enhance our perception of key subject matter.
Sharpness is a tool. Where it allows us to see the reason for the photograph, it is needed. Where it distracts us from that reason, it should be avoided. Like all photography, it is a compromise.
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Forum: General Photography
02-21-2021, 05:27 PM
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In this gif there is a 3' wide tv close to 5' back which will cover the frame with a 35mm lens on my apsc sensor. The model is 2.5' away, half way between. The shift is to a 70mm lens and moving back another 2.5'. The model stays the same size. The tv gets bigger. You can see the whole frame and then a smaller part of the frame bigger. The tv, and thus cows are flat so the perspective is completely in the magnification. of course my placement wasn't exact. but I move twice as far back and the cows grow by half thus giving a perspective of being closer.
Edit: I did the Spinal Tap, Stonehenge of using inches instead of feet. 3", 3'
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Forum: General Photography
02-21-2021, 11:53 AM
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Forum: General Photography
02-21-2021, 11:51 AM
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On the first point, i struggled for how to state this and retain the information I wanted to convey in as short a way as possible.
With perspective you have 2 parts. You point out the subject to background. There is also subject elements like nose to eyes. The latter should be apparent if you learn one lens well. The background perspective should become apparent when you know that 2x lens takes 2x distance so 1/2 the background in the same amount of picture. If you see 3 cows instead of 5 cows around your subject in your photo they are bigger. Perspective tells us a cow gets smaller the farther away it is. I see this information included in what I am saying.
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Forum: General Photography
02-21-2021, 11:33 AM
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That is what I am getting at. Certainly don't think about what somebody took at 28mn or 65mm, think about what you want to achieve.
And the difference between a 6 blade straight vs a 9 blade rounded aperture calls you to think about what you want to create.
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Forum: General Photography
02-20-2021, 09:44 PM
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Equivalence is used as a shortcut to use different lenses in different formats to get what you, or someone else, already did without having to think about. A jpg shrinks total information and destroys the rest. A raw keeps the information but makes you input what to do with it, called the creative process of developing your photo. Well there are ways of thinking about what is equivalent due to optics in easy general ideas that allow you to build up a photo and it can even build a photo to look like one that has already been done but you will understand what has been done. That information wasn't thrown away.
Here are the 2 main things.
1) Frame a subject the way you like at whatever fstop you like and no matter what lens you use it will have the same area in focus.
2)However far away you are from the subject to get that framing, the surrounding background will twice as big as the subject the same distance away from the subject as you are.
This does have implications but start with that.
Of course everyone talks about the bokeh. Here is the thing about bokeh. If you worry about bokeh you quit caring about what is in your background by default. the reason is you either have to move your background twice as far back or forward to get the same background. (see 2 above) So if you already don't care about the background just move your subject farther away from what ever is behind.
Now the corollary for the background. If you frame with a 100mm at 11m the background at 11m is 2x the subject frame and the 200mm would be 2x at 22m but at half that distance just 1x How convenient that distance is 11m. meaning the background for 100 at a given distance is twice the background for the 200mm at the same distance.
Now go learn one lens well on your system. Look at your subject and figure out how big a frame you should use. Now think about how much background you want around the subject. You should already know how much will be in focus because it is the same for any lens and just a little bigger for a different format. You learned one lens so you know how far away you need to be and how much background that will give you. If you want half the background use a 2x focal length. If you want twice the background use 1/2x the focal length.
You have composed the picture before you even had the camera in your hands. You could have used the format equivalence to figure out the lens to get a look and copied it but there was little of you in the creating process, you were not present for that part.
and think about that bokeh a little more. If the background is smaller it has to expand to fill the sensor. Just like zooming in on the back of your camera, things get blurrier. If you expand beofre taking a picture or expand after on the back of your camera it looks blurrier.
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Forum: Pentax SLR Lens Discussion
02-19-2021, 05:39 PM
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I laughingly wish you hadn't done that. It made me wonder how accurate my measurement was quickly standing behind a coffee table and moving the coffee table to hit my knees and using that distance. To satisfy my OCD and rid my mind of the nagging thought I had another go. This time I put the tape on the floor against the wall and the camera on the ground and lay down to see while using the floor boards to keep parallel. Then my camera strap was hiding the sensor mark and I spent time trying to figure out where it was without moving the camera. It turns out the SIgma 18-35 at 35mm will frame 3' at 4'10.5". So now I wonder if it is a true 35mm at infinity. Thankfully I don't have a football field near enough to go measure! That could lead to testing all my lenses for true FL and then mapping the breathing. Can I assume the different Pentax apsc have very close working sizes? or is the ks-2 20mp sensor just different enough to shift things >say 1%?
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Forum: Pentax SLR Lens Discussion
02-19-2021, 03:05 AM
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Due to insomnia I just realized and checked that Tony Northrup video. When he shows his comparisons he is doing it on a monitor and lies by omission. He scales each differently. If the ff is scaled at 50%, the m43 is scaled to 75%. The em-10 has 16.1 MP the canon5dii has 21.1 MP. He presents them as being the same while ignoring he is presenting different resizing and using different pixel pitch and these are what creates any difference he shows in the noise and dof.
What he really says is if we pretend different things are similar things we can show that similar things produce different things.
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Forum: Pentax SLR Lens Discussion
02-18-2021, 07:40 PM
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Mine was right here and you have me curious.
The 18-35 is great close up. I just informally checked mine at 35mm I framed a 3' picture with a little over and measured to 5.5' away. AOF calculator says 40mm should have give my results. I checked my 40m xs which was almost exactly 3' so the Sigma at 35mm giving me 38-40" from 5.5' shows negligible focus breathing. all discrepancies are within the accuracy of my measurements.
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Forum: Pentax SLR Lens Discussion
02-18-2021, 02:36 PM
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