JimKasson

JimKasson

Lives in United States Monterey, CA, United States
Works as a Retired Electrical Engineer
Has a website at blog.kasson.com
Joined on Feb 22, 2014
About me:

http://blog.kasson.com/?page_id=2285

Comments

Total: 62, showing: 1 – 20
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"The triple-camera array on the rear of the device features a 6x focal length range, and includes a 77mm (equiv.) focal length (3x) telephoto module, a 13mm (equiv.) F1.8 ultrawide module and a 26mm (equiv) F1.5 wide module."

The focal lengths are FF equivalents, but the f-stops aren't, right? Isn't that stacking the deck?

Link | Posted on Sep 15, 2021 at 15:03 UTC as 25th comment | 3 replies
In reply to:

Ian Loveday: Can someone explain the real need for this other than bragging rights? Its somewhat cumbersome to operate, and using slightly faster film stock would bring the same results on a less exotic lens. Besides, (sorry, spoiler alert!) the far side of the moon is not always dark, why not shoot it when the angle of the sun gives you good definition of terrain detail, unlike relying on starlight or earthlight?

The far side of the moon is not always dark. In fact, when there's a new moon on earth, it is nearly fully illuminated. It is fully illuminated during a solar eclipse.

Link | Posted on Jun 8, 2021 at 22:00 UTC

I don't really see the point of assigning a scalar value to a camera.

Link | Posted on May 23, 2021 at 19:23 UTC as 96th comment | 5 replies
In reply to:

Banana Chips™: sry guys i already have all the available samples, all 4 of them. you are not missing anything...wide open it's very blurry on the corners at all focal lengths...3/10 would not recommend. i am just using them as coat racks.

Not my copy:

https://blog.kasson.com/lens-screening-testing/examples/excellent-180-400-zoom/

Link | Posted on May 21, 2021 at 15:10 UTC

Oh, no! That's a fantastic lens.

Link | Posted on May 21, 2021 at 15:08 UTC as 61st comment | 2 replies
In reply to:

panther fan: A fantastic article. One smaller nitpick

"we use the R6 as a proxy here as the sensor measurements are identical"

I don't know if that is exactly fair. The R6 (and R5) only allow 12bit capture in electronic shutter mode, which hurts base ISO DR. I think the 1DX III might offer 14bit readout so results could be slightly different.

Craw truncates the 14th bit before compression.

Link | Posted on Mar 10, 2021 at 05:13 UTC
In reply to:

AriesII: But Sony said the A7R-IV has "15-stops" of DR! And yet not one reviewer is able to achieve 15-stops. Marketing garbage and lies.

EDR referenced to 8 MP. Just like Sony usually does. Not a lie, but downhill with a tailwind.

Link | Posted on Mar 10, 2021 at 05:06 UTC
In reply to:

panther fan: A fantastic article. One smaller nitpick

"we use the R6 as a proxy here as the sensor measurements are identical"

I don't know if that is exactly fair. The R6 (and R5) only allow 12bit capture in electronic shutter mode, which hurts base ISO DR. I think the 1DX III might offer 14bit readout so results could be slightly different.

craw is 13 bit precision at best.

Link | Posted on Mar 9, 2021 at 18:50 UTC

Is your threshold for EDR SNR = 1 or SNR = 0 (FS/RN)?

Link | Posted on Mar 9, 2021 at 18:33 UTC as 79th comment
On article Leica introduces APO-Summicron-SL 28mm F2 L-mount lens (256 comments in total)

"As is universally appreciated with all Leica lenses, the fastest aperture delivers maximum performance."

I've never tested a Leica lens for which that was the case.

Link | Posted on Feb 18, 2021 at 17:57 UTC as 39th comment | 2 replies

CO 60/4, CV 125/2.5 Macro, Leica 100 Macro Apo-Elmarit-R, Leica 280/4 Apo-Telyt R, Nikon 8/2.8, Nikon 55/3.5 Micro, Leica 90/2 'cron M, Nikon 120/5.6 EM, Schneider 90/4.5 Apo Componon, Nikon printing Nikkors.

Link | Posted on Feb 6, 2021 at 20:24 UTC as 159th comment | 1 reply
In reply to:

SantaFeBill: I know very little about Apple products, but in general a change of this magnitude in system architecture creates problems with sw written for previous versions.
Should be interesting.

"I can still run 20 years old programs on Win7."

I can run Zork I on WIn 10 (in a shell). That's a 50-year-old program.

Link | Posted on Nov 10, 2020 at 20:38 UTC

Why do both planets appear to be fully illuminated by the star? Are they well behind it?

Link | Posted on Jul 27, 2020 at 16:26 UTC as 9th comment | 5 replies
In reply to:

SmilerGrogan: Hmmmm...Such a tough one. Profoto charges a price that allows the company to maintain a workforce, provide a very deep set of light shaping tools, create awesome tutorials, and stay in business for the last 40 years.
Godox is a more modern company that its taking advantage of the globalist brainwashing that traditional (i.e. ethical) companies like Profoto charge too much because they pay their employees fairly.
Is this patent infringement? No clue. But somehow it doesn't smell right.
On the other hand, Nikon got its start with the S-series rangefinders that were very, very similar to the Leica M series and we've seen how that turned out.

The Nikon S cameras were not at all similar to the Leica M series. They are quite similar to the Contax's, though.

Link | Posted on May 7, 2020 at 03:59 UTC
In reply to:

JimKasson: "... and color temperature can be adjusted in 50K increments"

Huh? Do you mean 50 degree increments?

I stand corrected. I was a physics major in the early 60's, and I never knew this: "In 1967/1968, Resolution 3 of the 13th CGPM renamed the unit increment of thermodynamic temperature "kelvin", symbol K, replacing "degree Kelvin", symbol °K." until now.

Link | Posted on Apr 25, 2020 at 03:37 UTC

Ordered. In stock at B&H. Review to come.

Link | Posted on Apr 25, 2020 at 01:09 UTC as 2nd comment
In reply to:

JimKasson: "... and color temperature can be adjusted in 50K increments"

Huh? Do you mean 50 degree increments?

Color temperature is measured in degrees Kelvin.

Link | Posted on Apr 24, 2020 at 20:33 UTC

"... and color temperature can be adjusted in 50K increments"

Huh? Do you mean 50 degree increments?

Link | Posted on Apr 24, 2020 at 17:21 UTC as 5th comment | 6 replies

Lots of gear has allowed me to do things I couldn't otherwise do. I couldn't have done Staccato (https://www.kasson.com/gallery/staccato/) before the D3. I couldn't have done much of Timescapes (https://www.kasson.com/gallery/timescapes/) without the Betterlight scanning back. But the piece of gear that has changed my life the most in the past few years is a Foba camera stand. Setups that were a pain are now effortless.

Link | Posted on Apr 16, 2020 at 13:39 UTC as 139th comment | 3 replies
On article Loupedeck+ review (135 comments in total)

I bought a Loupedeck + in 2018. Is this the same unit? I found the software made editing sufficiently slow that direct access to the functions produced no net time savings, and considerable annoyance. In addition, it would quit working from time to time and need a reboot to get it started again.

Link | Posted on Feb 24, 2020 at 21:23 UTC as 8th comment
Total: 62, showing: 1 – 20
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