Dvlee

Dvlee

Joined on Nov 29, 2011

Comments

Total: 161, showing: 41 – 60
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On You'll have to wait a "year-ish" for Google Glass post (76 comments in total)
In reply to:

Deleted pending purge: Well, someone can begin working on a wireless device that disables or scrambles all image and sound-recording gadgets within, say, 50 meters around it.
I imagine many would like to have something like that installed on their premises, so it should be on the shelves sooner than in a year-ish.
Unless, of course, some big money finds a way to make it illegal, by declaring that "personal freedom of recording has been taken from the people"...

@ Old Arrow...I beleive it is already illegal to operate a jamming device but it is not illegal to construct a pysical barrier that blocks cell signals. Some movie theatres and restaraunts have installed copper sheeting to block cell signals from their establishments.

Direct link | Posted on Apr 23, 2013 at 19:51 UTC
On You'll have to wait a "year-ish" for Google Glass post (76 comments in total)
In reply to:

Deleted pending purge: Well, someone can begin working on a wireless device that disables or scrambles all image and sound-recording gadgets within, say, 50 meters around it.
I imagine many would like to have something like that installed on their premises, so it should be on the shelves sooner than in a year-ish.
Unless, of course, some big money finds a way to make it illegal, by declaring that "personal freedom of recording has been taken from the people"...

Our soldiers in Afghanistan carry with them a device called "Thor" that jams cell phone signals so that explosive devices cannot be remotely detonated. It weighs about twentyfive pounds.

Direct link | Posted on Apr 23, 2013 at 19:34 UTC
In reply to:

QuarryCat: makes no sense for me.
I use a 35 or 50 mm or even a 28 mm - one alone is enough - my feet are the zoom - no ned for another big, expensive compromise lens.
sounds crazy.

a 2,0/35-105 mm would be fantastic and a 4,0/50-300 mm is urgent needed...

There's a time and place for everything...times when a prime is fine and times when you need the flexibility of a zoom.

If you are in a fixed position and don't have the option to move in or back away, then a zoom will allow you to get some extra coverage or to get a little closer without having to crop in post and sacrifice pixels.

Changing position also changes perspective and with a wide angle getting in closer could result in some unpleasant distortion effects.

And packing a couple wide aperture primes covering that range;an 18, a 35 and something in the middle like a 24 or 28, would cost some serious cash and take up some serious camera bag space. In the Sigma line that would cost about 2K for comparable primes.

As far as I know Sigma makes the shortest 1.8 prime, a 20MM which goes for $630. So a 1.8 zoom of that focal range makes alot of sense.

The only arguement in favor of a prime would be superior image quality, which at 1.8 may be no better than a zoom.

Direct link | Posted on Apr 18, 2013 at 20:38 UTC
In reply to:

utomo99: Why DIGIC 5 ? Why Not DIGIC 6 ?
Canon SX270 HS using DIGIC 6

Because next year they can release an upgraded version so that everyone who bought this one can have a touch of buyers remorse. Its a new model so of course they have to hold back on features on the first one.

Direct link | Posted on Mar 21, 2013 at 17:50 UTC

I've been waiting for Canon to upgrade the exposure bracket to five shots for us HDR shooters. I guess I'll have to wait a little longer.

In the meantime I'll have to keep on using a third party smart phone app to do what should be built into the camera.

Direct link | Posted on Mar 21, 2013 at 07:21 UTC as 43rd comment | 1 reply

Honey, I shrunk the Rebel!

Direct link | Posted on Mar 21, 2013 at 07:07 UTC as 88th comment
On Photoshop Gradient Tool: Blending Images article (223 comments in total)
In reply to:

Da99ve: The original dramatic sky is great, too. Leave it alone, as well. ;) No big foreground focal point is required other than the gentle arid nodule already there.

If this was all just a hypothetical test, fine. But I hope people don't over-think their original visions/moments, which is the heart of photography.

The brighteness on the right side of the sky makes the image seem less ominous. That might have been fixed with just a tonal adjustment, but since the point of the article is about blending images, that would have defeated the purpose of the article!

Direct link | Posted on Mar 12, 2013 at 20:41 UTC
On Photoshop Gradient Tool: Blending Images article (223 comments in total)
In reply to:

madeinlisboa: The more Photoshop you use the less photographer you are... I use Photoshop only for creativity and extreme problems. I still use Capture NX for 99% of my photos.
It's sad to reach a point when you don't know if it is a photograph anymore...

That sounds very much like what they were saying about Eduard Steichen 115 years ago!

The painters said it wasn't art and the photographers said it wasn't photography.

Your opinion on Photoshop simply defines how you prefer to approach photography and is not an accurate description of all photographers.

Long before digital photography existed, we used to say that clicking the shutter is only the start of the photographic process. There's alot that takes place after the exposure is made that must be done for the photographers vision to be realized.

I could argue that if all one is doing is making a few tweaks in tone and color, that it's really no different than a snapshooter who drops the film off at the minilab and lets someone else finish the process. That would be an inaccurate statement but no less accurate than saying that using more photoshop makes one less a photographer.

Photography is a two step process, one is what happens before you take the shot, and one after.

Direct link | Posted on Mar 12, 2013 at 20:35 UTC
On Photoshop Gradient Tool: Blending Images article (223 comments in total)
In reply to:

jeep: One of the best uses of layer masks is selectively combining different exposures of the same scene to achieve a natural looking HDR image, without the overblown look of HDR software and tone mapping.

If done proerly, HDR can yield pefectly natural results. And an image properly tonemapped for a natural look appear more natural than an image pieced together in layers.

It's a matter of skill, and a matter of intent. And very much a matter of opinion.

There are times to strive for a natural look and a time for a more surrealistic look. This has been true not only as long as photography has been around, but as long as art in any form has been around!

Unskilled artists tend to be a bit heavy handed when applying special effects. But in the right hands, heavily tone mapped images may bring a beauty and interest to a scene that would otherwise be dull and boring. It takes as much skill to apply a heavy special effect without over doing it as it does to apply the effect to make it appear natural.

I revisited some of the images I had pieced together from bracketed shots and layers, and tonemapped them in HDR. They look more natural via HDRI than through layers.

Direct link | Posted on Mar 12, 2013 at 18:51 UTC
In reply to:

Mssimo: If your shopping for monitors, make sure you buy a IPS panel. The other common type that is very bad for color and view angle is called TN.

Dell Ultrasharp monitors use LG panels; these are the same panels used in apple's best monitors. They are also used by HP pro line monitors.

I have two U3011's. (decoded name: Ultrasharp 30" 2011) They are huge. The 27" has more pixel density but its 16:9 (Less Height than 16:10; 2560x1600 vs 2560x1440)

@M Jesper.Not everyone knows every technical spec about every device. I'm far from stupid or technically illiterate but I have no idea what IPS or TN stand for.

Direct link | Posted on Feb 14, 2013 at 22:22 UTC
On First Impressions: Metabones Speed Booster article (359 comments in total)
In reply to:

Dvlee: Some years ago i worked for a studio that had a room full of vintage gear. There was a kit of old large format lenses that had interchangable rear elements that screwed onto the back of the shutter module. These elements enabled the the same lens to be used for 8x10 and 4x5 with exactly the same field of view. They seemed to work as well on other lenses that shared the same shutter module.

In 2002, when I first learned about the APS-C crop factor, I had opportunity to ask an optical designer if it was possible that such an element could be built into lenses for APS-C to compenste for crop factor so that the lens would have the same field of view on APS-C.

He explained, not only is it possible, it is the same principle that used in zoom lenses.

We all know that to focus a lens, al we are doing is moving the lens in relation to the film/sensor plane. Lookthe rear element of a prime lens and you'll see it move in and out as you turn the focus ring.
(Continues in REPLY)

This lens was designed to provide an increase in speed using full frame lenses on an ILC, but I am more intrigued by the potential of this concept to allow full frame lenses to deliver the same field of view on APS-C.

With image stabilization, better noise reduction, and each generation of cams having better hi ISO performance, the need for faster lenses is moot. It’s more about the optical qualities of wide aperture(shallow depth of field, bokah) than “speed.”

When using a full frame lens APS-C crop factor forces us to either step back to get the same field of view, which changes perspective and depth of field, or use a shorter focal length, which will not have the same optical or depth of field qualities.

Lens makers have addressed the APS-C wide angle problem by making even wider lenses. Even the Canon 17mm tilt shift seems to have been created to address this.

This actual usefullness is limited to retaining the qualities of lenses like the 50mm1.2 ir 17mmTS-E.

Direct link | Posted on Feb 10, 2013 at 02:33 UTC
On First Impressions: Metabones Speed Booster article (359 comments in total)
In reply to:

Isit13: I've understood the maximum speed for a lens is dependent on the rear element diameter vs the sensor distance?

If so, this means you cannot get any magical low size number mounting a version of this with a f/1.2 Noct Nikkor?

I might add that this only work when using a lens designed for a big sensor on a camera with a smaller sensor, becasue the lens is designed to project a larger image circle and the adapor is shrinmking it donw to the size of the small sensor. It would work using a full frame lens on the smaller APS-C chip but not on a full frame sensor. The adaptor would make the image circle too small and the corners would be cut off.

The way this works is the exact opposite of a teleconvertor, which makes the image circle bigger, stretching the image out and making it appear larger. By spreading the image out...same amount of light over a wider space makes it dimmer.

Lens designers do know about this concept but it's a trickier design to build into the lens. Instead of designing these wide angle convertors into the lenses, they have instead given us ultra wide lenses for APS-C. I have an 11mm which is equal to 17mm on full frame and thats pretty damn wide!!

Direct link | Posted on Feb 6, 2013 at 02:47 UTC
On First Impressions: Metabones Speed Booster article (359 comments in total)
In reply to:

Isit13: I've understood the maximum speed for a lens is dependent on the rear element diameter vs the sensor distance?

If so, this means you cannot get any magical low size number mounting a version of this with a f/1.2 Noct Nikkor?

I wish I could draw you a diagram because its so hard to describe in words.

1st...this adaptor does not have any direct effect on the lens or the f stop. It does not increase the amount of light that enters the lens, it is only taking the light that is being projected in a wide beam and tightening the angle of the beam to a more narrow beam so that the SAME amount of light is being onto a smaller space. The same amount of light in a smaller space makes the light brighter.

2nd...the adaptor does not make the lens wider. You cannot make a 200 MM act like a wide angle. The problem is that when we use a wide angle lens intended for a large sensor on a camera with a small sensor, the lens projects too big a circle and the tiny sensor only sees a small portion of it; it crops the image, so the chip only see a portion of the image.

This adaptor makes a 40mm act like a 40mm by projecting a smaller image onto a smaller chip. It focuses the light into a small space and makes it brighter

Direct link | Posted on Feb 6, 2013 at 02:20 UTC
On First Impressions: Metabones Speed Booster article (359 comments in total)
In reply to:

nathanleebush: Am I crazy or is there not more barrel distortion with the adapter? Nobody seems to be talking about that. The aspect ratio is the same, but the image seems to warp more.

Its hard to tell with the samples provided...but I think I might see some distortion but not so much that could not easily be fixed in Photoshop.

Direct link | Posted on Feb 5, 2013 at 20:50 UTC
On First Impressions: Metabones Speed Booster article (359 comments in total)
In reply to:

Isit13: I've understood the maximum speed for a lens is dependent on the rear element diameter vs the sensor distance?

If so, this means you cannot get any magical low size number mounting a version of this with a f/1.2 Noct Nikkor?

If you take the same amount of light that covers a large area and redirect it so it covers a smaller area, you now have the same amount of lightconcentrated in a smallers space, which makes it brighter.

Its kind of like using a spotlight which uses a lens to adjust the size of the spot...the smaller the spot of light the brighter it become.

All this lens does is add one more element of refraction to the light path, bending it so as to turn a wide cone of light that covers the larger sensor area into a narrow cone of light that just covers the smaller sensor.

This not only concentrates the light making it brighter but also compresses the image so that the part of the image that would lie outside the sensor is now inside.

I think the fact that it compresses the angle of projection and enables the full field of view to be projected onto a smaller sensor is FAR more interesting and usefull than its brighteness boosting function.

Direct link | Posted on Feb 5, 2013 at 20:41 UTC
On First Impressions: Metabones Speed Booster article (359 comments in total)
In reply to:

Dvlee: Some years ago i worked for a studio that had a room full of vintage gear. There was a kit of old large format lenses that had interchangable rear elements that screwed onto the back of the shutter module. These elements enabled the the same lens to be used for 8x10 and 4x5 with exactly the same field of view. They seemed to work as well on other lenses that shared the same shutter module.

In 2002, when I first learned about the APS-C crop factor, I had opportunity to ask an optical designer if it was possible that such an element could be built into lenses for APS-C to compenste for crop factor so that the lens would have the same field of view on APS-C.

He explained, not only is it possible, it is the same principle that used in zoom lenses.

We all know that to focus a lens, al we are doing is moving the lens in relation to the film/sensor plane. Lookthe rear element of a prime lens and you'll see it move in and out as you turn the focus ring.
(Continues in REPLY)

If you look at a zoom lens you'll see the rear element stays still during focusing but moves while zooming in and out. He explained that the rear element(s) in a zoom plays an important role in the spread(coverage) of the cone of light which determines the magnification of the image. The lens elements that actually focus the lens are in front of the rear element(s). So in essence the rear element in a zoom lens is a built in tele/wide angle converter.

There really is no reason why a lens element to do this cannot be designed right into the lens.

So why don't they do this? It's a matter of economics. It's easier to design and manufacture the lenses without having to deal with an added element . Most APS-C cameras are designed to be smaller, lighter and less expensive than full frame lenses and the lenses need to mirror that design philosophy.

But it is possible and it would be better to have it specifically designed for a particular lens and built in than to use an adaptor.

Direct link | Posted on Feb 5, 2013 at 17:33 UTC
On First Impressions: Metabones Speed Booster article (359 comments in total)

Some years ago i worked for a studio that had a room full of vintage gear. There was a kit of old large format lenses that had interchangable rear elements that screwed onto the back of the shutter module. These elements enabled the the same lens to be used for 8x10 and 4x5 with exactly the same field of view. They seemed to work as well on other lenses that shared the same shutter module.

In 2002, when I first learned about the APS-C crop factor, I had opportunity to ask an optical designer if it was possible that such an element could be built into lenses for APS-C to compenste for crop factor so that the lens would have the same field of view on APS-C.

He explained, not only is it possible, it is the same principle that used in zoom lenses.

We all know that to focus a lens, al we are doing is moving the lens in relation to the film/sensor plane. Lookthe rear element of a prime lens and you'll see it move in and out as you turn the focus ring.
(Continues in REPLY)

Direct link | Posted on Feb 5, 2013 at 17:13 UTC as 29th comment | 3 replies
On CameraMator connects your mobile devices and DSLR post (57 comments in total)
In reply to:

Suave: A used Galaxy s2 off craigslist was $120, DSLRController was $10, and now I can control not "some" but pretty much any function of my camera.

DSLR Controller has alot of the features I look for .

But even though my new smart phone was a very recent product at the time, out of the box the version of Android it came loaded with was obsolete. Even if I upgraded to the newst possible version the phone would accept, I would have to root the phone for DSLR Controller, something I was not willing to do.

DLR Controller does not have much backward compatibility.

Direct link | Posted on Jan 15, 2013 at 19:10 UTC
On CameraMator connects your mobile devices and DSLR post (57 comments in total)

Does it have Live View, touch focus capability like DSLR Controller does?

Direct link | Posted on Jan 15, 2013 at 18:58 UTC as 7th comment
On What's new @ CES 2013 article (126 comments in total)
In reply to:

Deleted pending purge: Retro look, cameras looking the way they don't have to any more, funny colors, cheap(er) copies... but not much of what the end users wish.
And while manufacturers should pay more attention to users, it seems their ideas come from the sources which, I think, are quite distant from its buying public. Too large percentage of "new" comes from juggling the old, anyway.
In the end, we never get exactly what we want, rather what's a bit closer to what we want, from among what we can choose...

It's like fashion...retro is in. Colors are in. People have grown tired of white/gray/beige/black devices. Maybe it's not what you want but other people do.

There are lots of people who like retro, funny colors. Frankly,I've grown bored with bland white/beige/gray/silver/black colors schemes for devices. But that's me and I'm not you.

I'm sure there's something out there you like. In fact the choices are so overwhelming it's hard to choose just one without feeling like I'm missing out on something . That's life! Always been that way and always will be!

Keep in mind these are devices being shown at the CONSUMER electronics show, not a professional photographers show.

However, I have to disagree that they are not paying attention to what end users want. These devices may not reflect your wants, but they do reflect what other consumers want. These companies are not as stupid as you may think, and they will sell billions of dollars of this junk.

Direct link | Posted on Jan 13, 2013 at 02:08 UTC
Total: 161, showing: 41 – 60
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