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

Comments

Total: 102, showing: 1 – 20
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I'd love to see a Canon 120mp sensor in an M series body. I could downsize to 1/4 original pixels to eliminate bayer artifacts and end up with a clean 30mp image.
ISO 50 would be OK with me, up to ISO 1600. I wouldn't need more speed than that.
What might be holding back some of these revolutionary products is the market expectation for excellent video up to 4k and beyond, as well as insane ISO speeds.

Link | Posted on Apr 20, 2018 at 14:04 UTC as 6th comment | 1 reply
On article Tiny micro-camera sensor is self-powered by light (75 comments in total)

This seems to me to be a simpler version of the Foveon sensor used in all Sigma cameras. Visible light hits the top layer of photodiodes and can make an image, while the infrared passes through the top layer and can make a buried photovoltaic layer work as a battery. I assume there is an external capacitor used with the sensor described here, so that fast variations in light level will not cause appreciable variations in sensor operating voltage. But, nothing is said in the press release about this capacitor.

Foveon has three layers per pixel, and the depth of each layer works with the spectrum attenuation factors of silicon to provide color information. The lowest layers are quite sensitive to infrared. An infrared filter is usually placed above the sensor to block infrared, so that rendering of colors in the image will not be distorted by it.

Link | Posted on Apr 13, 2018 at 02:02 UTC as 20th comment
In reply to:

Tom Schum: One day I hit a wrong key and lost the entire contents of my LaCie backup drive. All gone because of one false move.
My advice is either make two separate backups on two separate backup drives, or don't back up any of it at all. Personally I do not feel like buying another LaCie product ever, but of course your results most likely will be much better than I ended up with.

All I remember is a block opened up (like the one when you hit "file" in a word processor) and being in a hurry I clicked before I had the cursor aligned on the "open" option. After that, all gone. Hours spent trying to get anything back and had no luck.
These computers are all set up for you to just make one tiny simple mistake. Then they gloat.

Link | Posted on Apr 11, 2018 at 18:16 UTC

One day I hit a wrong key and lost the entire contents of my LaCie backup drive. All gone because of one false move.
My advice is either make two separate backups on two separate backup drives, or don't back up any of it at all. Personally I do not feel like buying another LaCie product ever, but of course your results most likely will be much better than I ended up with.

Link | Posted on Apr 10, 2018 at 00:31 UTC as 10th comment | 4 replies
In reply to:

Indohydra: It is not clear whether Samsung is interested at all in competing in the sensors designed for "photographic" sensors. I will assume the the market will impacted mostly for cell phone sensors.

You could take half a dozen cell phone sensors and half a dozen lenses, view the same scene with each, and cobble together the results to make an image competitive with larger sensors. This sort of thing might be the real future of high end photography.

Link | Posted on Mar 16, 2018 at 19:32 UTC
On article Canon patents 400mm F5.6 catadioptric 'mirror' lens (220 comments in total)

I have a Samyang 300mm F6.3 catadioptric lens for my Fuji X-E1. It is very difficult to focus since depth of field is very thin, and needs to be used on a sturdy tripod. Also the lens vignettes strongly at the edges.
So Canon might have to include optical stabilization as well as autofocus. Has anyone heard of an optically stabilized catadioptric lens?

Link | Posted on Dec 15, 2017 at 20:43 UTC as 49th comment | 2 replies

It might be interesting to see a real DPR lens review for this system.

Link | Posted on Dec 14, 2017 at 00:33 UTC as 9th comment | 1 reply
In reply to:

Tom Schum: Looks like a Ricoh GR with (1) interchangeable lenses and (2) an EVF.
Great idea! Too bad it costs so much money!

But the GR still doesn't have (1) interchangeable lenses and (2) EVF. This Leica also allows use of legacy M-mount lenses with an adapter. Great stuff, too bad the price is so high!

Link | Posted on Nov 22, 2017 at 14:41 UTC

Looks like a Ricoh GR with (1) interchangeable lenses and (2) an EVF.
Great idea! Too bad it costs so much money!

Link | Posted on Nov 21, 2017 at 14:24 UTC as 85th comment | 5 replies
In reply to:

Tom Schum: I've used Leica M lenses on my Fujifilm X-E1 using a Fuji M-mount adapter. Superb manual operation! I think I might prefer it over the M10 since live-view is in the EVF of the X-E1 (no need to look at the rear LCD).
A more modern choice might be the X-Pro2 with the M-mount adapter.
Will we see something like this from Leica anytime soon?

I'm not highly knowledgeable about Leica bodies. However, after looking at a few in the DPR camera section, it seems there is not one that has a built in EVF and a M-type lens mount.
Most require an add-on EVF regardless of lens mount, not something I would want. The ones I saw with EVFs have fixed lenses.
So, it looks like Leica has no competition for the Fuji X-Pro2 with an added Fuji M-mount adapter. You get OVF, EVF, and M-mount. Legacy M-mount lenses are wonderful even on my early generation X-E1, so small and easy!
Does the CL or XY upcoming Leica have an EVF and an M-mount?

Link | Posted on Nov 10, 2017 at 17:57 UTC

I've used Leica M lenses on my Fujifilm X-E1 using a Fuji M-mount adapter. Superb manual operation! I think I might prefer it over the M10 since live-view is in the EVF of the X-E1 (no need to look at the rear LCD).
A more modern choice might be the X-Pro2 with the M-mount adapter.
Will we see something like this from Leica anytime soon?

Link | Posted on Nov 10, 2017 at 15:01 UTC as 164th comment | 2 replies
On article Leica Thambar-M 90mm F2.2 sample gallery (214 comments in total)
In reply to:

BBnose: Why the bokeh looked so poor? All are ring shape not perfect disc with soft edge.

Donut bokeh is also a feature of Catadioptric lenses such as the Samyang 300mm F6.3 reflex lens. If the focal length were less it could make an excellent portrait lens.

Link | Posted on Nov 8, 2017 at 14:07 UTC
On article Leica Thambar-M 90mm F2.2 sample gallery (214 comments in total)

Very nice samples. This lens might be good competition to the Lomo 85 Petzval.

Link | Posted on Nov 7, 2017 at 14:11 UTC as 109th comment
On article Fujifilm X-E3 Review (753 comments in total)
In reply to:

Tom Schum: Samples gallery posts continuous Sony ad, instead of shooting parameters. I can't get rid of it. I'm using a Chrome browser running on a Chromebook. This is the first time I've had this kind of problem with any DPR samples gallery.
About the camera, I've been using X-E1 bodies since they came out, am seriously considering either X-E3 or X-Pro2. I saw no comments about using the viewfinder with glasses, although the photo showed it in use this way. If I am not mistaken, the eye point is reduced (shorter distance from EVF eyepiece) from previous XE-series designs.

Samples gallery fixed now. Thanks!

Link | Posted on Oct 31, 2017 at 21:28 UTC
On article Fujifilm X-E3 Review (753 comments in total)
In reply to:

Everythingis1: Man for all the crap that people constantly give Sony cameras for not being ergonomic, I'm baffled that people can even hold these Fuji cameras.

I have seen the X-Pro2 and it is big, like the old days. Plenty to hold onto. This is one reason I like it, and might buy it instead of the X-E3.

Link | Posted on Oct 26, 2017 at 15:05 UTC
On article Fujifilm X-E3 Review (753 comments in total)
In reply to:

Bueche: Something with x-trans is very wrong. Take a closer look at the leaves on the distant trees.....
https://3.img-dpreview.com/files/p/TS6000x4000~sample_galleries/5798831135/3269268294.jpg

Bad resolution and 'worms' all over the place. It actually looks like the photo was taken with a 2 MP camera.

I downloaded and installed the free Fuji/Silkypix raw developer (278mb, ver 4.2.8.0, from http://www.fujifilm.com/support/digital_cameras/software/myfinepix_studio/rfc_2/win/
Then I downloaded and opened the raw version of the image linked above. Comparing the foliage on the tree behind the "NW 52nd St" sign, it appears that the Fuji raw developer renders it slightly better, with less evidence of the crawly wormy appearance seen in the DPR image.
This is an old controversy well discussed on the Fuji forum in DPR. Nobody likes the Fuji developer and nobody uses it and lots of people complain about the rendering in third party developers. Try the Fuji software. In my opinion it does a little bit better job.

Link | Posted on Oct 26, 2017 at 14:57 UTC
On article Fujifilm X-E3 Review (753 comments in total)
In reply to:

pharles: I've been a big fan of the X system ever since it first appeared and I've been a long time X-E1 user. That said, the X-E3 looks like Fujifilm took their eye off the ball.

I eagerly awaited the X-E3 as I wanted a camera with a better sensor, better EVF and better AF than the X-E1, plus a tilt screen and weather sealing. When the the X-E3 was announced, I bought another brand of camera instead.

OK, I get that every camera is a compromise and that no camera can be all things to all people, but really? Turning the latest X-E camera into an iPhone?

I've been a smartphone user going way back when a BlackBerry was the only game in town. I was the project manger for one of our company's BlackBerry rollouts. I don't have a problem with technology, touch screens or smartphones, but if I want to do the swipey thingy and bludgeon semi-unresponsive icons to get things done, I'll use my iPhone to take pictures.

Pandering to the smartphone crowd won't build market share. They're already gone.

pharles wrote: "The X-E series was about providing a serious system camera, a serious photographic tool at a reasonable price, but with the X-E3 it's become about the gadgetry."
I agree. Leica is starting to look better and better to me, with it's limited set of features that do not try to do it all, just simple stills done very well. My only problem with Leica is that "affordability" factor...

Link | Posted on Oct 26, 2017 at 13:53 UTC
On article Fujifilm X-E3 Review (753 comments in total)
In reply to:

kadardr: X-E3 got a very clear differentiation of UX and target audience compared to X-T2 and X-T20. The user interface of new cameras should converge more towards smartphone photo apps UI than the other way around. The world now has much much more smartphone users than camera users. The sheer boasting about image quality is absolutely not enough any more. The use of an eye level viewfinder with a touch screen is not totally figured out yet. Using at least 4" touch screens should be the trend.

Ideally, the touchscreen would be exported to the smartphone via Bluetooth, and there would be no need at all for an LCD on the camera.

Link | Posted on Oct 26, 2017 at 13:49 UTC
On article Fujifilm X-E3 Review (753 comments in total)

Samples gallery posts continuous Sony ad, instead of shooting parameters. I can't get rid of it. I'm using a Chrome browser running on a Chromebook. This is the first time I've had this kind of problem with any DPR samples gallery.
About the camera, I've been using X-E1 bodies since they came out, am seriously considering either X-E3 or X-Pro2. I saw no comments about using the viewfinder with glasses, although the photo showed it in use this way. If I am not mistaken, the eye point is reduced (shorter distance from EVF eyepiece) from previous XE-series designs.

Link | Posted on Oct 26, 2017 at 13:46 UTC as 29th comment | 1 reply
In reply to:

Tom Schum: Things I wish they would think about, from the viewpoint of a Fuji mirrorless user:
Weather resistant build. Fuji has some of these now, bodies and lenses.
Detachable rear LCD (usually I don't need it because the EVF is that good). Too soon to expect this kind of innovation though.
Short flange distance goes without saying.
Big battery. Fuji and most others have smaller batteries that don't run for long.
Functional adapters for legacy lenses (Fuji makes only one so far as I know, an excellent M-mount adapter). Nikon would have to do at least two, so all legacy Nikon lenses would be supported (full manual in the worst case, but supported without leaving the Nikon garden).
I hope they will decide to leave video out of the equation, or produce a strictly video alternative.
Small lenses please! Fuji has only recently started with some of these and the idea is a very good one. Nikon needs only one lens to get the mirrorless product going, then users will use adapters.

While this was my original thought, the idea that the LCD display could be remote on a nearby smartphone did not occur to me. This seems like a great idea to me. I could do without the LCD display, or I could use a smartphone as a display. In fact, why even bother with a rear LCD when a remote link to a smartphone will deliver a better display! The EVFs are now getting so good that the rear LCD is merely a convenience.

Link | Posted on Sep 21, 2017 at 01:24 UTC
Total: 102, showing: 1 – 20
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