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Forum: Mini-Challenges, Games, and Photo Stories 10-13-2022, 11:18 PM  
Thematic Pp 436
Posted By chd
Replies: 17
Views: 778
Very nice everyone! I was going to do a black and white one, but it was hard because there's so much good color in this one.... :)
Forum: Pentax Full Frame 10-10-2022, 08:36 PM  
Pentax K-1 mark iii
Posted By chd
Replies: 344
Views: 21,047
"Sensors are better now" doesn't change the argument. If sensors with small pixels are better, and I agree they are, then yay. But sensors with big pixels will also be better by the same amount, and so they retain their lead.

If it's a non-issue for the photography you do, then that's a win.

However, there will always be edge cases and difficult settings that push the limits, and you will still see the differences there. Math and physics don't lie, and if one disagrees with what they are saying, the only counter argument that can possibly be valid is also based on math and physics. Not simply examples. Bring the science.
Forum: Mini-Challenges, Games, and Photo Stories 10-08-2022, 06:16 PM  
Post-Processing #435
Posted By chd
Replies: 12
Views: 692
Alternate version with (perhaps) better web... :-)

Forum: Pentax Full Frame 10-07-2022, 11:10 PM  
Pentax K-1 mark iii
Posted By chd
Replies: 344
Views: 21,047
Enlargement is irrelevant. Your shot noise and read noise will be combined with our own. You will be assimilated. Resistance is futile.
Forum: Mini-Challenges, Games, and Photo Stories 10-06-2022, 10:45 PM  
Post-Processing #435
Posted By chd
Replies: 12
Views: 692
What happened to all the people??

Oh, wait... I think I know....

Forum: Pentax Full Frame 10-05-2022, 05:08 PM  
Pentax K-1 mark iii
Posted By chd
Replies: 344
Views: 21,047
If you want to compare apples to apples, take the same image (with identical settings, obviously), and crop the K-1 image down to 4928 x 3264 pixels, so that it is exactly the same dimensions in pixels as the K-5 image. The K-5 image will be slightly noisier, I predict.
Forum: Pentax Full Frame 10-05-2022, 12:03 AM  
Pentax K-1 mark iii
Posted By chd
Replies: 344
Views: 21,047
You've answered other more recent posts in this thread, but not mine, so I repeat...

Physics hasn't changed since then [the Stanford lecture I posted earlier]. Math hasn't changed since then. So, what has changed that makes this correct in 2016 and not correct today?


The question stands.

Has there been a breakthrough in physics or math that invalidates what's presented here? Has there been a breakthrough in the manufacture of sensors that allows them to exceed these basic physical constraints?
Forum: Pentax Full Frame 10-04-2022, 05:20 PM  
Pentax K-1 mark iii
Posted By chd
Replies: 344
Views: 21,047
He is teaching the theory. Examples are just illustrations.

Physics hasn't changed since then. Math hasn't changed since then. So, what has changed that makes this correct in 2016 and not correct today?
Forum: Pentax Full Frame 10-03-2022, 05:59 AM  
Pentax K-1 mark iii
Posted By chd
Replies: 344
Views: 21,047
As I said, which you missed or are ignoring, the underlying physics has not changed. You're looking for a specific example and missing how it actually works.
Forum: Pentax Full Frame 10-02-2022, 10:41 PM  
Pentax K-1 mark iii
Posted By chd
Replies: 344
Views: 21,047
Not so...

I recommend taking the time to watch this. It is both interesting and illuminating, if you'll forgive the expression. Yes, it is a bit over six years old, but as far as I know they haven't released an updated version of physics since then (at least not the sections relevant to digital photography), so it's all still valid. Pixel size is specifically addressed around the 8 minute mark, but really the whole thing (and the whole series) is worth watching. Noise and signal to noise ratio, very relevant to dynamic range, at about the 54 minute mark.

lecture8-13apr16

-C
Forum: Mini-Challenges, Games, and Photo Stories 10-02-2022, 03:29 PM  
Post-Processing Challenge #434
Posted By chd
Replies: 13
Views: 694
I put a small little Nessie in mine, but it wasn't too obvious (far right side in the upper part of the water). :-)
Forum: Pentax Full Frame 09-30-2022, 09:11 PM  
Pentax K-1 mark iii
Posted By chd
Replies: 344
Views: 21,047
This doesn't actually surprise me, and really my improvement wish list for it is fairly small and fairly minor. I have the original K-1 (non-II) because I already had it when the II came out, and the changes weren't worth the investment in the II for me at the time. However, if my current K-1 were run over by a truck, I would buy the K-1ii to replace it in a second, no waiting for whatever the successor might be.
Forum: Pentax Full Frame 09-28-2022, 12:57 PM  
Pentax K-1 mark iii
Posted By chd
Replies: 344
Views: 21,047
I'm sorry but I don't think this is at all correct... you get more dynamic range and less noise from *larger* photo sites (pixels). Ability to hold more photons = more possible values between black and white. The accuracy of the sensor site is proportional to the amount of light it can collect.

Photon shot noise also goes up with photo site size, but not as fast; it goes up roughly as the square root of the number of photons collected, so larger site = better signal to noise ratio.
Forum: Pentax Full Frame 09-27-2022, 10:24 PM  
Pentax K-1 mark iii
Posted By chd
Replies: 344
Views: 21,047
Perhaps up to a point, but in the end physics will have the last word. :)
Forum: Pentax Full Frame 09-27-2022, 03:44 PM  
Pentax K-1 mark iii
Posted By chd
Replies: 344
Views: 21,047
It seems to me that it would have to be, because smaller pixels as above - though I don't have a good idea whether the difference would be significant. I'm sure someone can bring the math. :)
Forum: Pentax Full Frame 09-27-2022, 02:54 PM  
Pentax K-1 mark iii
Posted By chd
Replies: 344
Views: 21,047
I don't know that I agree with that. Assuming you keep the same sensor size, more pixels = smaller pixels. I want bigger pixels.
Forum: Mini-Challenges, Games, and Photo Stories 09-26-2022, 08:08 PM  
Post-Processing Challenge #434
Posted By chd
Replies: 13
Views: 694
Here's a quick go...

Forum: Troubleshooting and Beginner Help 09-24-2022, 01:24 PM  
Confused by different types of RAW file
Posted By chd
Replies: 12
Views: 953
I switched from using PEF to using DNG quite a while ago, mostly because it's more standardized and likely to be supported longer. Other than somewhat theoretical concerns like that though, either should work equally well.
Forum: Photographic Technique 09-24-2022, 01:20 PM  
Portrait Lens - First Family Shoot
Posted By chd
Replies: 14
Views: 1,031
I don't have the Sigma 24-70 so I don't know how fast it is or what the image quality is like, but it seems fairly popular so I assume it's good, in which case that would probably be my first choice, with the 28-105 a close second. But as others have said, a lot comes down to your personal preference.
Forum: Troubleshooting and Beginner Help 09-23-2022, 02:56 PM  
Uploading raw files to Amazon Photos
Posted By chd
Replies: 17
Views: 2,552
Agreed, on both counts. A copy on Amazon is better than no copy, but I would not have it be my only backup.

But there's nothing wrong with cloud-based backups that I see. That's what I use. Just use a service whose job is keeping backups; there are some reputable ones. I use CrashPlan, and I think Carbonite is generally well regarded also.
Forum: Pentax Full Frame 09-23-2022, 02:49 PM  
Pentax K-1 mark iii
Posted By chd
Replies: 344
Views: 21,047
AF speed and accuracy and buffer size and speed are really the only things about my K-1 that I notice enough to wish for changes. Even there I'm not sure improvements would warrant another $2k investment for me.

Obviously Ricoh has to be convinced that people want the improvements badly enough to replace their current K-1, or they won't make the investment in developing them.
Forum: Mini-Challenges, Games, and Photo Stories 09-02-2022, 12:33 PM  
Post-Processing PP 431 - Photobombing hand
Posted By chd
Replies: 13
Views: 759
Photoshop's content-aware fill did the heavy lifting. It worked better here than it sometimes does because there's nothing behind the hand that has a lot of detail to recreate, like part of a building or something. It took some tinkering with the selection to get it to work smoothly, and then you have to re-create most of the sun.

I played with adding a lens flare, which would probably be more realistic if you're not shading the lens, but I decided not to because I thought it was a better image without.
Forum: Mini-Challenges, Games, and Photo Stories 09-01-2022, 04:04 PM  
Post-Processing PP 431 - Photobombing hand
Posted By chd
Replies: 13
Views: 759
My attempt...

Forum: Mini-Challenges, Games, and Photo Stories 08-26-2022, 03:02 PM  
Thematic Pp 430
Posted By chd
Replies: 16
Views: 795
Tried to get more detail while retaining the mostly black look...

Forum: Mini-Challenges, Games, and Photo Stories 08-24-2022, 12:01 PM  
Thematic Pp 430
Posted By chd
Replies: 16
Views: 795
Hi -- couple questions: is there a higher resolution version available? All I seem to be able to download from here is a 256 x 170 Tiff. Though if that's what you want us to work with - ok. :-)


Second - I'm unclear on what the ask is... it sounds like you want the flower to be black, but it already looks pretty black to me (a few hints of dark red). More black? Keep black but needs more detail? Wide open for any improvements? :-)


Thanks!
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