Mike Sandman

Mike Sandman

Lives in United States Brookline, United States
Works as a Retired management consultant
Joined on Mar 20, 2003
About me:

Sony Alpha 7Rii - switched in Sept 2015 from Canon 5D Mark II; Sony 16-24mm f/4 FE; Sony 24-70mm f/4 FE; Sony 16-35mm f/4 FE; 70-200 f/4 IS; 24mm TSE II; Tamron 90mm f/2.8 Macro; Sigma 15mm f/2.8 fisheye; Leica R f/2.8 135mm Elmarit; Novoflex R to EF converter. Epson 3880 printer. Sony NEX 6. Started with a Balda 35mm rangefinder in 1956.

Comments

Total: 206, showing: 1 – 20
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In reply to:

Mike Sandman: The drawings for curved sensors show an arc or parabola for the sensor, so at first glance, it looks like the the sensor is bent along only one axis. Doesn't a curved sensor have to be bent along both the horizontal and vertical axes, making it a three-dimensional paraboloid rather than a two-dimesional parabola?

Yes, an orthoganal vie would be confusing to some, but enlightening (pun intended ) to others. To each his or er own. :-)

Link | Posted on Jul 22, 2017 at 01:03 UTC
In reply to:

Mike Sandman: The drawings for curved sensors show an arc or parabola for the sensor, so at first glance, it looks like the the sensor is bent along only one axis. Doesn't a curved sensor have to be bent along both the horizontal and vertical axes, making it a three-dimensional paraboloid rather than a two-dimesional parabola?

The only surprise is that there was no discussion in the article or comments about the greater complexity of making a parabaloid - a sensor curved on both horizontal and vertical axes.

There are numerous illustrations on the web of paraboloids, so it's surprising to see a patent application that doesn't include a drawing of that sort, with light "rays" being shown by using an orthogonal view..

Link | Posted on Jul 21, 2017 at 20:18 UTC

The drawings for curved sensors show an arc or parabola for the sensor, so at first glance, it looks like the the sensor is bent along only one axis. Doesn't a curved sensor have to be bent along both the horizontal and vertical axes, making it a three-dimensional paraboloid rather than a two-dimesional parabola?

Link | Posted on Jul 21, 2017 at 16:58 UTC as 56th comment | 6 replies

When I left the corporate world, I immediately switched to a Mac despite the cost and the Apples's walled garden. The Apple OS boots and wakes so much faster than Windows, and it's more stable. Speed and stability save time and frustration, and when you throw in Apple's superb customer support vs. Dell, the cost difference is justified - at least to me.

Link | Posted on Jul 18, 2017 at 03:52 UTC as 218th comment | 4 replies
In reply to:

PhotoKhan: Next from Screw Bar: An app featuring a rotary dial that disables all other phone functions and requires you to actually do the semi-circular movements to dial a phone number.

There's a rotary dialer app already -- it's Rotary Dialer, on the Apple app store. I think it's been available since 2008. You can select from among several rotary dial "skins" including one from a classic black phone, and you can even get the dialer's sound effects.

Link | Posted on Jul 14, 2017 at 22:19 UTC
On article Video: Removing a stuck lens filter... with a band saw (139 comments in total)

I've managed to loosen a stuck filter by wrapping a heavy rubber band around it and twisting. But this looks like the nuclear solution if nothing else works.

You can try this at home, folks, but after the cut, be sure to vacuum the stray metal shards away from the lens!

Link | Posted on Jun 29, 2017 at 15:17 UTC as 28th comment

This is a significant update for A9 owners, and perhaps others. You may want to move this from "Latest Articles" over to the main news board on the home page.

Link | Posted on Jun 27, 2017 at 20:00 UTC as 17th comment | 2 replies
On article Peak Design Everyday Backpack Review (123 comments in total)

For a similarly positive review of the Peak Designs backpack, see http://thewirecutter.com/reviews/our-favorite-camera-bags/

Link | Posted on Jun 26, 2017 at 15:16 UTC as 12th comment
On article Now we know: Sony a9 is sharper than we thought (394 comments in total)

I usually look at the studio shots as a way to judge noise and various ISO settings, and to compare noise differences between camera bodies at the same ISO. The studio shot is very helpful for that purpose. But it doesn't seem like the best way to measure resolution. The do-over is interesting from a technical point of view. But for resolution, wouldn't a resolution test chart be better? It seems to me that it would be easier to focus accurately, and the results would be less subjective.

Link | Posted on Jun 22, 2017 at 17:45 UTC as 94th comment
On article Shiftcam for iPhone 7 Plus review (59 comments in total)
In reply to:

dr.noise: I have read that right, but not at the first try

Yes, the name does prompt a double-take. Like the reflexive association called forth by "iPad" when it was introduced, but more so.

Link | Posted on Jun 8, 2017 at 02:56 UTC

I took the advice of many that filters can cause distortion & reflections and took my UVs off all my lenses. Then I chipped the front element of a $1200 lens and it cost $360 to replace the element. So now I'm thinking... $100 is cheap insurance. This article is very helpful, particularly with regard to the effectiveness of coatings, although I did wonder about what would happen at different wavelengths. But... THANK YOU!, even if it's not perfectly definitive.

Link | Posted on Jun 5, 2017 at 21:20 UTC as 5th comment | 2 replies
On article Google will no longer develop Nik Collection (390 comments in total)

It's OK, folks -- it still will work. I got the Nik Collection for free free and use Silver Efex.

It seem unlikely that Adobe would change the way PS and Lightroom handles plug-ins, so the Nik apps will still be useful for a long time to come. They just won't get any better (or worse).

Link | Posted on May 30, 2017 at 17:42 UTC as 169th comment | 4 replies

In the discussion of the barriers to switching, dPreview commented that going to an a9 was attractive and a lot less expensive for wedding photographers than it is for sports photographers. But all of your subsequent discussion has been focused (pun intended) on sports photographers.

I submit that there are a lot more weddings every week than there are newsworthy sports events, and therefore there are a lot more wedding photographers than sports photographers. If Sony picks off a substantial slice of wedding photographers, they'll probably be very happy to penetrate the sports photog market more slowly.

Link | Posted on Apr 25, 2017 at 19:59 UTC as 103rd comment | 4 replies

"It rains every day for 11 and a half months."
In which two weeks of the year does it not rain?

Link | Posted on Apr 24, 2017 at 02:54 UTC as 7th comment
On article Throwback Thursday: Our first cameras (393 comments in total)

Balda 35 mm. possibly the Baldina model, a gift from my father around 1956. Traded up to a Kodak Retina Reflex in 1959.

Link | Posted on Mar 16, 2017 at 23:04 UTC as 148th comment

Thanks, Broncolor!
There's a really good book on this subject - Light, Science & Magic" by Fil Hunter & others. The book includes a bit of theory along with diagrams of setups, but the practical examples in the videos are excellent.

Link | Posted on Mar 13, 2017 at 22:19 UTC as 13th comment
On article Ask the staff: electronic or optical viewfinder? (891 comments in total)

I started taking photos when cameras were ALWAYS "on" - because they didn't have batteries. You just put the thing up to your eye. focused, composed, and took the picture. So it's maddening when I put the camera up to my eye and the viewfinder is black because the camera is off or the viewfinder has gone to sleep. The smaller size of EVF cameras plus all that info in the viewfinder offsets the black viewfinder issue. But I have missed some shots because of it.

Link | Posted on Mar 13, 2017 at 02:51 UTC as 187th comment | 1 reply
On article Things we found at CP+ 2017 which had been cut in half (89 comments in total)

Ok, the sandwich has been cut in half, but not lengthwise, so it's not symmetrical. What good is that?

And the pickles haven't been cut at all.

Link | Posted on Feb 27, 2017 at 02:32 UTC as 7th comment | 1 reply
In reply to:

FLruckas: Your dust removal tool is gonna be busy....
And if you use an IR cutoff filter....
Look out.
Are the markings radioactive?
Just kidding....
Well....
Sort of.....
:-)

The web site says the paint is UV reactive, so perhaps the markings absorb ambient UV and reflect back (or glow) in the visible spectrum.

Link | Posted on Feb 21, 2017 at 00:57 UTC
On article Throwback Thursday: Minolta's prosumer DiMAGE 7 (209 comments in total)

Thanks for rhe Throwback memory. I still have my 2003 model Dimage 7Hi. It was my first digital camera, and the manual zoom ring was excellent, especially for someone making a transition from 35mm film camera zooms. In decent light, the image quality was not bad - certainly capable of producing good 8x10 prints. I have one of those hanging on the wall at home. The range of external controls set a standard that insn't often matched today.

Link | Posted on Feb 9, 2017 at 22:37 UTC as 57th comment
Total: 206, showing: 1 – 20
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