Tom Schum

Tom Schum

Lives in United States Washington DC area, AK, United States
Works as a Electronics
Joined on Aug 30, 2010
About me:

Photo hobbyist


Total: 37, showing: 1 – 20
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It's good to see a new lens of this type that is not simply a copy of Lomo's Petzval.
There must be another ten legacy lens designs nearly lost in the dustbins, and this particular one seems very worthy of a modern refresh!

Link | Posted on Apr 15, 2016 at 16:28 UTC as 12th comment
On article Swirly bokeh: Lensbaby announces Twist 60 lens (121 comments in total)
In reply to:

Marty4650: I think I finally understand how this works.

If a lens really does a bad job at anything..... flare, blur, aberrations, etc... then it becomes a highly desirable "creative tool." And someone will prize it for these characteristics.

And if the original bad lens can be had on ebay for $20, then someone will come along and create a new version of it for $300.

I give Lensbaby a lot of credit for finding this product niche, and milking it for everything it is worth. Seriously, this is capitalism at its finest.

To me it looks like Lensbaby has simply copied Lomo on this one, minus the Lomo exchangeable aperture plates.
I wonder why, when there are hundreds of vintage lens designs, they had to copy Lomo.

Link | Posted on Apr 14, 2016 at 00:18 UTC
On article Seriously sharp: Sony FE 85mm F1.4 GM samples (263 comments in total)
In reply to:

jkrumm: Looks like it would come in handy for a dermatologist, especially combined with the A7RII.

I was thinking dentist, for remote dental exams on whoever might be the latest celebrity.
Looks like Sony has the world's best lenses now.

Link | Posted on Mar 10, 2016 at 17:23 UTC
On article CP+ 2016: Things we found that had been cut in half (135 comments in total)

Your Sigma lenses should have held together better.

Link | Posted on Feb 29, 2016 at 17:39 UTC as 21st comment
In reply to:

ZhanMInG12: The ergonomics is quite inexplicable. The EVF is not only not on center but also not in a place where either eye can use it comfortably. And if you're not going with an articulate screen anyways, why not put the iso button on the screen's right side? And then there's the bottom...

But I suppose this is Sigma, and they have a tradition of weird designs. I'd buy it - if it came in E-mount.

Looks like the SD1 grip is living on, in the new cameras. Personally I like the Quattro design, but that SD1 grip was perfect for me and I can't forget it.

Link | Posted on Feb 24, 2016 at 03:53 UTC
In reply to:

Marc Ramirez: I like the design. Battery grip looks cool too. It should really have different mounts, m43, E, etc. Especially since sigma is now in the adapter game.

Maybe this is going to give them enough time to come up with a really good shallow mirrorless mount, in the next couple years.

Link | Posted on Feb 24, 2016 at 03:41 UTC
In reply to:

Mssimo: The biggest issue with sigma is support for RAW files. Last time I used sigma RAW converter it was a nightmare. Crashing, taking 15 secs to refresh after making a simple exposure adjustment and so on. If they could only work with adobe or another company to get raw support in third-party software.

And it will most likely remain a niche because the sensor itself is profoundly different from any color filter array (CFA) alternative. This is a mathematical enigma, solved every time a Foveon camera takes an image. It is very intensive and will always run slowly compared to CFA, no matter how advanced the processors get.

Link | Posted on Feb 24, 2016 at 03:36 UTC
In reply to:

AkashRana: I never quiet understood Sigma SA-mount cameras, and their foveon sensors; which are presumed to be so great but i see no adopters for those sensors. Still bayer rocks the world

Foveon is a different animal. Most people won't like it. Hence the popularity of the iPhone 5 camera.

Link | Posted on Feb 24, 2016 at 03:31 UTC

I hope DPR will review at least one of these.

Link | Posted on Feb 24, 2016 at 03:06 UTC as 92nd comment | 1 reply
On article The long, difficult road to Pentax full-frame (617 comments in total)

Really well-written article with great legendary imagery!

Pentax might interest its existing medium format owners by offering adapters so their MF lenses can be used on the K-1, lenses such as
HD Pentax-D FA645 35mm F3.5 AL [IF].

While not cheap, these lenses could work very well on the K-1 and they are already in the Pentax product line.

Link | Posted on Feb 19, 2016 at 17:30 UTC as 99th comment | 3 replies

If this camera is going to have a Sony sensor, is there any chance it will be the sony FF BSI as found now in the A7RII?
Pentax might be bringing a Sony sensor (of any size) to the market in this camera but hopefully they will bring it in a more photographer-friendly minimum-fiddle durable body. They can sell a lot of Sony sensors this way so why not sell it with the best available sensor at the moment?

Link | Posted on Jan 30, 2016 at 19:23 UTC as 19th comment | 8 replies
On article Happy Holidays from dpreview! (119 comments in total)

In 2016, please think more about selling expansion capacity in the DPR galleries. I'm sure I'm not the only one who would like a bigger space.
Also, the format of the newer photo sample galleries really wants to have a high bandwidth connection. I miss the option to download and view a "large" version of random sample photos.

Link | Posted on Dec 27, 2015 at 14:45 UTC as 10th comment | 1 reply

Portraits are too somber, too angry.

Link | Posted on Dec 13, 2015 at 12:16 UTC as 14th comment

The Sigma SD1M comes with a removable IR filter. No political correctness here; just a little flick of the fingernail and the filter is removed (and the very fragile IR filter is just as easily re-installed).
I've seen full-spectrum photos on the Sigma forum here at DPR, and am not impressed, but that's just me not being into the art.
There is a whole IR subculture using these cameras without the IR filter; maybe 10-20 people in the Sigma forum.

Link | Posted on Dec 2, 2015 at 15:24 UTC as 5th comment | 1 reply

Fujifilm sells an infrared-capable X-T1 through B&H. So maybe Ricoh will slightly change their marketing strategy in the future.

Link | Posted on Dec 2, 2015 at 15:09 UTC as 6th comment

If Samsung has allowed Sony to take over, we are all the losers. Sony's strong push into the upper reaches of sensor design seems to be dominating the markets at this point, whether in Sony cameras or other brands.
So we have one fewer sensor manufacturer out there, and fewer choices for our art.
Even with my Fuji system I am supporting Sony, who has built the basic sensor my Fujis use. Same for many other brands.

Link | Posted on Nov 27, 2015 at 13:05 UTC as 95th comment | 3 replies

What kind of shutter? Is it focal plane or leaf?

Link | Posted on Oct 16, 2015 at 00:15 UTC as 21st comment | 1 reply

Those IBM microdrives were absolutely astounding at the time. Nobody could touch it in terms of size and density.

Link | Posted on Oct 4, 2015 at 22:21 UTC as 9th comment
On article Leica Q In-depth Review (1115 comments in total)

At the lower end, competition is the Sigma DP1M and DP1Q with 28mm FF equivalent fields of view. Also we have the Ricoh GR with the same field of view and much better high-ISO performance than the Sigma. You can buy all three for less than the price of this new Leica (it goes without saying).
Why is Leica finally going down this road? I think it's a good idea to put a fixed lens in front, with an internal leaf shutter. You can control all aspects of the optical performance and there is no worry about how the camera might perform (or not) with different lenses attached. Dust ingress is another big problem somewhat mitigated by this approach, as others have said.
I think Leica chose a good focal length but again Sigma is going to be ahead of the game with its DP0Q (21mm FF equivalent).
The Leica idea of adding crop settings in-camera is a brilliant innovation, and when you have a high resolution sensor and a top quality lens you aren't going to lose much by cropping large.

Link | Posted on Jun 11, 2015 at 01:12 UTC as 295th comment | 1 reply

The Sigma Merrill sensors operate entirely without interpolation between adjacent pixels. They do quite well with monochrome. It is valid to say that all OTHER sensors require and use interpolation.

Link | Posted on Jun 2, 2015 at 23:06 UTC as 112th comment | 5 replies
Total: 37, showing: 1 – 20
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