BobORama

Thanks for *your* review, BTW. I had one of these years back, and while it looks like a toy from a distance, it was actually an incredibly capable camera and the 50/2.8 was sharp, useful. 110...

Gosh, I hope Pentax doesn't find out they are out of business, they might stop shipping cameras and lenses. The K-5 is a fairly light, small dSLR with a optical view finder, in combination with a ...

That was my point entirely, its a convenient cheat to avoid lengthy algebraic computations to map one representation to another.   Its an expedient, not a fundamental truth about how color works. T ...

Placed 20^th in the challenge. Look at 'em, so cute and fuzzy! If they were a lot bigger they would be like flying Persian cats.

In a word, interpolation. A "3D" 10-bit / channel representation would require ~4GB to achieve an arbitrary 1:1 LUT that maps between equal bit depth representations. For a 16-bit / channel a 1:1 ...

Practical effects for The Andromeda Strain II: The Andromening

From K-5 to K-1 you don't improve sensor resolution.    Comparing the FoV, however, you gain 1 stop in the look of DoF on any lens.   You gain pixel shift, which is not a gimmick -  its is very ...

Placed 11^th in the challenge. This is a small section about ( 1.5mm horizontal FoV ) of an IBM test wafer with various patterns and shapes used to verify proper operation of a chip fabrication workflow.

If you used a scanning fluid to wet mount the negative it was wet scanning. :-)  The fluid is usually naptha spirits based or similar which are chemically compatible with film stock and have a ...

Take the above and sprinkle in some noise.   How does that flow through a DFT or FFT and ultimately to your MTF measurement based on this resolution target?

I'm kind of remembering that from a harmonic analysis perspective the variance for each term is the same, as they need to sum up over all terms to the variance in the original signal.   This ...

In your OP you seemed to suggest using a non-sinusoidal reference would be more suitable given human perception is not a linear.   Is that what you were proposing?

Aren't the special properties of sinusoidal patterns as it relates to MTF measurement the reason one would want to use them?    I guess I am trying to understand the motivation behind all the ...

My "Gremlins! rules" for SD Cards: 1.  Never insert the card into a reader / computer with the write protect off. 2.  Never "delete" files / folder even on the camera. 3.  Avoid moving cards ...

Inability to use Flash and Pixel Shift Inability to use PC Socket / LANC with Pixel Shift

You can do some what-iffing in the DPR comparison tool.   ( or the old one which had the K-5. https://www.dpreview.com/reviews/image-comparison?attr18=daylight&attr13_0=pentax_k3iii&attr13_1=pentax ...