Kendall Helmstetter Gelner

Kendall Helmstetter Gelner

Lives in United States Denver, CO, United States
Works as a Photographic Product Developer
Has a website at
Joined on Dec 30, 2002
About me:

Working on Phototgraphy and Photographic software.

Proud member of the International SIgma Users Group


Total: 82, showing: 1 – 20
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On article In pictures: PhotoPlus Expo 2015 (26 comments in total)
In reply to:

baldeagle21b: Yeah, it was pretty boring. Just a bunch of stuff. Drones were pretty cool though.

I didn't think it was boring at all - it's the first year I've been. I really liked the wide assortment of practical photographic gear - but what I liked even more were the wide range of classes and seminars you could sign up for. I took a few and they were pretty good.

Direct link | Posted on Oct 26, 2015 at 01:40 UTC
In reply to:

ColdViking: Betteridge's law of headlines: "Any headline that ends in a question mark can be answered by the word no."

So, no.

There are a few reasons, and a far, far, far better alternative. Reasons:

1/ It runs a mobile chip, the chip will never be able to do what a laptop or desktop chip can do. Want to do RAW? Forget about it. Never going to happen. There is no way the ARM chips are going to be able to power through that.

2/ It runs an operating system designed for a phone. It shows. It doesn't work.

3/ The apps are not there, and due to (mostly) hardware and software limitations of the device, they're never going to be there either.

The alternative, if you want to use a tablet, is a Microsoft Surface Pro. It's a real PC. It blows anything ever created by Apple out of the water for real work. It also isn't all that much more expensive than the iPad pro.

The iPad "Pro" is for those easily separated from their money.

1) The processor in the new iPad pro will be a bit faster than the new Macbook. iPads today can already work with RAW files.

2) What does that even mean. It obviously works or people wouldn't buy them.

3) "The Apps Are Not There". Perhaps you missed the large numbers of demos during the keynote? The apps will be there when the hardware is there, and after the new Pro hardware comes out you will see much more serious apps that take advantage of the greater resources the pro offers.

The Surface Pro is nice but is still just a PC. The iPad Pro is coming at things from a more modern angle.

Direct link | Posted on Oct 3, 2015 at 22:41 UTC
In reply to:

MeganV: It looks tantalizingly close, to me.

Unfortunately, Apple's persistent need to stupefy and sandbox everything throws a few critical, structural roadblocks in the way.

(1) Screen color / brightness calibration still isn't possible, unless you duck back-and-forth into apps like Spyder gallery. How can you edit (or create), seriously, if you can't trust your screen? It's crazy that they'd put all that work into the feel and precision of the "pencil" and then *not* offer a way to calibrate color. Is it a real artist's tool or not?

(2) We need access to the file system. I've never understood why siloing files away in individual app repositories is "easier" than allowing *me* to organize them in folders of *my* choosing. "Real artists ship"--i.e., they create *a lot* of files that they need to organize.

(3) Until the iCloud (or Dropbox or Google Drive) is as fast as a connected SSD, we need a way to mount a real drive. Disallowing it seems so arbitrary!

(1) Apps can individually support a profile, if a number of them standardize around a few formats it should be pretty easy (If the calibration companies are smart they will build iOS libraries to make it easy for app developers to make us of profiles).

(2) A file system has always been the worst way to organize... except for all the others. That said you can use a real file system - iCloud Drive, or Dropbox are all options that are basically filesystems you can explore.

(3) Modern iOS devices have very, very fast SSD onboard. If you are using something like Dropbox is can easily download a large set of images locally for editing, it will sync back up pretty quickly. But again, professional apps could even have ways to shuttle back and forth to a PC over a local wired connection, or even a local external drive...

Direct link | Posted on Oct 3, 2015 at 22:38 UTC
In reply to:

ABM Barry: Nope! this is not an option, .. no SD slot, no connection to external device.
Can't calibrate the screen!

It seems that Apple simply won't allow us to control our workflow and data/files, ..... Nothing changes in the apple-house!

I guess it will sell, but not to pro's that require full edit.

Get rid of the itune restrictive control module, and give ME MY DATA I CREATE IT, I OWN IT, I EDIT IT, ONLY I DECIDE HOW IT'S USED! ...NOT APPLE!
It seems Apple operates like a cult!
I bought into Apple only to find out, .. what it couldn't do! No thanks. .....

The iPads have had USB all along, with the Camera Connection.

Instead of calibrating the screen, you'll be calibrating professional apps.

The iPad connects to all kinds of external devices. It's called a network...

iOS DOES allow control over data/files, but the application has to be aware of how to do so.

I very much doubt you ever "bought into Apple", and even if you did you didn't try very hard to understand how to make it work. You just tried to treat it like a PC which is obviously a mistake.

Direct link | Posted on Oct 3, 2015 at 22:33 UTC
On photo Aspen grove and the moon in the December magic night challenge (10 comments in total)

Really like this image, I loved how the shape of the moonlight echoed the shapes of the trees...

Direct link | Posted on Jan 16, 2015 at 02:57 UTC as 5th comment | 1 reply
On photo Mystical - Enchanted Valley in the Mystical challenge (32 comments in total)

Great image, would not have thought you could get such good light out of even a full moon with such a short exposure at that ISO/aperture... very inspiring.

Especially love how visible the waterfall is.

Direct link | Posted on Jan 16, 2015 at 02:44 UTC as 16th comment

Sad to see no mention whatsoever of the Sigma DP-1, one of the first large-sensor compacts that showed other camera makers there was a viable market and a value to that kind of camera.

Direct link | Posted on Sep 24, 2014 at 02:27 UTC as 10th comment | 1 reply
On Sigma 50mm F1.4 DG HSM review (579 comments in total)
In reply to:

stevo23: Flare and ghosting seem problematic with this one. Wonder if a hood helps much.

Oh yeah, the ghosting is just terrible:

Oh wait, that's the Zeiss Otus...

Direct link | Posted on Apr 18, 2014 at 15:53 UTC
On Sigma 50mm F1.4 DG HSM review (579 comments in total)
In reply to:

simpleshot: Of all the reviews so far (Lenstip, Digital Picture, DXO, SLR gear, Popular Photography, Gizmodo, Fstoppers), there are very little comments about contrast.
SLR gear claims that the local contrast on the Sigma is better than the Otus. Pop Photo just says that the Sigma produces "consistently-contrasty images".
I wonder why this area is largely ignored by reviewers.

You can also see that even here if you load up the comparison between this lens and the Zeiss. You can see the difference in contrast even when the image is reduced in size.

Direct link | Posted on Apr 18, 2014 at 15:51 UTC
On Sigma 50mm F1.4 DG HSM review (579 comments in total)
In reply to:

Abu Mahendra: If only it focuses competently, what we will have here is the finest 50mm autofocus lens ever made for the Canon EOS system.

@Boky, the beauty of the Sigma lens is that you can use the USB dock to adjust micro-focus just for that lens! So then you can have TWO properly focusing lenses on your Canon body. :-)

Direct link | Posted on Apr 18, 2014 at 15:48 UTC
On Sigma 50mm F1.4 DG HSM review (579 comments in total)
In reply to:

DStudio: This is clearly a good lens. Its images are nicer and more interesting than from most Sigma lenses.

But it does have flaws. For example, some of the samples appropriately show busy backgrounds (and foregrounds) that are sometimes distracting, even if you're not looking for them (example here:

The somewhat disappointing new Nikon 58/1.4 doesn't appear to suffer this malady. There are other 50ish lenses that don't either.

And the Zeiss OTUS does a good job of melding an analytically sharp lens with beautiful rendering, although I'd lean more toward beautiful (and less technical), given the choice. For example, as long as I'm going MF, I think I'd rather use some older Leica designs.

But in today's market technical quality is emphasized by many people, which has also yielded film like Kodak's Ektar 100 (which didn't appeal to me when I tried it). So while I might not choose it myself, the OTUS gives an amazing balance.

In that particular image, you have a lot of vertical lines. The Zeiss does exactly the same thing when encountering a busy background and sometimes just adds lines anyway:

And what is going on with the edge of this flower?

Direct link | Posted on Apr 18, 2014 at 15:47 UTC
On Sigma 50mm F1.4 DG HSM review (579 comments in total)
In reply to:

aftab: In a recent interview Sigma president commented that they could have made this lens a little more sharper, but if they did then they would have sacrificed some local contrast, so this is the balance they went for. So, the trade off between resolution and contrast continues in designing lenses. It has been said that historically Leica favored contrast slightly over resolution and Zeiss did the opposite. Leica surely were able to create more ardent fans with their approach than Zeiss did. In an interview Leica's top engineer said that although now lens designing is much easier with computer input compared to before, subjective human input of their designers continues as before. While this kind of tests or MTF surely gives us a good insight as to how the pictures from a lens would look like, real life pictures definitely would give us a more complete picture. After all it is not all about sharpness, CA, vignetting or distortion. Hopefully, DPR would show us some real life comparison.

You can see that too in the comparison shots. If you load up the comparison between the Sigma and the Zeiss Otis, the graph says that they start out the same sharpness in the center and the Sigma decreases toward the edges. But if you look at the images themselves, the Sigma looks slightly clearer throughout because the contrast is better.

Direct link | Posted on Apr 18, 2014 at 15:39 UTC
On Sigma 50mm F1.4 DG HSM review (579 comments in total)
In reply to:

CameraLabTester: Impressive low CA and distortion, but poor on vignetting. A good balance.


In what way "poor"? If you compare agains the Zeiss Otis it has slightly *less* vignetting! Some lens types simply have a bit of vignetting.

Direct link | Posted on Apr 18, 2014 at 15:37 UTC
On article CP+ 2014: Hands-on with Sigma DP2 Quattro (249 comments in total)
In reply to:

Frank_BR: Size-wise the Sigma dp2 Quattro is a giant. Indeed, it is wider than a Nikon D4! It is even wider than a medium format like the Leica S!

On the other hand, technically speaking the dp2 is a dwarf:
1. Maximum shutter speed: 1/2000s
2. Maximum ISO: 6400*
3. No video
4. No interchangeable lenses

(*) The low maximum ISO is a strong indication that the dp2 sensor is noisier than the traditional Bayer sensor.

It also has a flash sync of 1/2000, how many DSLR's with the same quality of output can say that?

Direct link | Posted on Feb 14, 2014 at 06:46 UTC
On article CP+ 2014: Hands-on with Sigma DP2 Quattro (249 comments in total)
In reply to:

TheDreamingWatchman: Cameras have only a small hump at the back, but a big one at the front.
And there's a good reason for that. The reason is our hand.

But this one has the big hump on the back.

"Cameras have only a small hump at the back, but a big one at the front And there's a good reason for that. "

Because companies like to follow the herd.

I don't recall many smartphones having that same characteristic, which is what most people use now for photos. If the Hump Design is the best one, why do smartphones and small compact cameras have no humps?

To me the Camera Hump is like the raised turbo scoop on the hood of a car lacking turbo...

Direct link | Posted on Feb 14, 2014 at 06:45 UTC
On article CP+ 2014: Hands-on with Sigma DP2 Quattro (249 comments in total)
In reply to:

carlos roncatti: Why the heck no photos with the guy holding the camera showing a position that he will take photos with it?

You can see a video of someone holding/using it here, it actually ends up looking fairly easy to hold:

Direct link | Posted on Feb 14, 2014 at 06:36 UTC
In reply to:

yabokkie: I think I understand the design a bit more now.

they intentionally made the right thumb less efficient for camera setting by locking it for holding. this will have a designed effect to make one drop the camera in operation more easily. then the poor guy may buy another dp.

Why do you think the thumb is locked? With the shape it has it seems easy to hold with fingers alone curled in front, leaving your thumb to work the controls.

Nothing beats holding it and knowing though.

Direct link | Posted on Feb 13, 2014 at 04:01 UTC
In reply to:

Gesture: We can spin things any way we want, but 15 down to 4.9 is not progress. If the Foveon issues could be solved, you go 10:10:10 at a minimum. That huge body begs an integral EVF or swivel design.

It's not 15 down to 4.9. It's 15 gone up to 19. You need to read how the sensor works again. You are going to be astonished when you see the sample images.

Direct link | Posted on Feb 13, 2014 at 03:55 UTC
In reply to:

Trollshavethebestcandy: It would be interesting to have a sensor of two layers, quad blue on top and a semi random Fuji like array of red and green underneath. 20 megapixels in both layers. This would reduce the limitation of red issue being under only one layer instead of two. Any thoughts? Am I crazy?

Why would you have a random array of red or green when you can have them everywhere? That's what the Quattro sensor does, red and green sensors across the entire frame, just one above the other. Only they really are not exactly red/green, Sigma just labels them as "middle/bottom" because they capture more than just red/green.

Direct link | Posted on Feb 13, 2014 at 03:50 UTC
In reply to:

Jules Design: ok so I shoot product photography with a D800 and 105 mm prime
tethered, in-studio, I meter the light, gray card. Will this baby outperform my current camera???

The DP3Q probably will, if you can live with the somewhat shorter focal length. The Current DP-M cameras already out-resolve the D800 in some situations, especially when there is fine detail.

Direct link | Posted on Feb 13, 2014 at 03:48 UTC
Total: 82, showing: 1 – 20
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