wus

wus

Lives in Germany Munich, Germany
Works as a Engineer
Joined on Nov 1, 2006

Comments

Total: 21, showing: 1 – 20
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On Red introduces 'Weapon' camera with 8K sensor option article (104 comments in total)
In reply to:

slippedcurve623: Nice camera, and glad to know they have larger sensor but one question, how are my existing super 35mm PL lenses gonna fit? Is it even compatible with EF lenses or do I have to invest in medium format lenses like the arri 65mm?!

I'm sure RED has thought about lenses. The 8K Sensor has 46mm diagonal, 3mm more than 35mm SLR lenses. I think most - particularly the better - SLR lenses should work.

Direct link | Posted on Apr 15, 2015 at 20:51 UTC
On Nikon announces Coolpix AW130 and S33 rugged compacts article (31 comments in total)

Even if we disregard the small sensor and apertures I wonder how good an underwater photo can be that's shot at 24mm through a flat port.

Direct link | Posted on Feb 10, 2015 at 15:17 UTC as 8th comment | 2 replies

Anyone know how I should understand this "the ability to dim the viewfinder’s OLED" that DPR writes above? An EVF in a Nikon DSLR??? That would be a first ...

Direct link | Posted on Feb 10, 2015 at 14:22 UTC as 60th comment | 1 reply
On Opinion: The myth of the upgrade path article (1457 comments in total)
In reply to:

jefrs: The aperture controls the amount of light. If you use the same shutter speed and the same f-stop and the same focal length(!) then the same amount of light hits the sensor irrespective of its size.
The F-stop is defined as focal.length / iris.diameter. It's simple optical physics and I am a professional physicist: it's like a funnel where the smallest hole determines how much stuff goes through it, it has nothing to do with the size of the bucket below.
You reviewers really, really, really need to get this or go back to school to learn your stuff.

I think it's rather you who needs to go back to school. To stick with you example: yes, if the focal length and f-stop are the same, the same amount of light goes through. But it will also be spread on the same area, and if a smaller sensor covers only half of that area, this smaller sensor will collect only half of the light. The remaining light is lost.

Direct link | Posted on Jan 30, 2015 at 22:54 UTC
On Opinion: Bring on the 70-200mm equivalents article (340 comments in total)

One of the reasons why 50 - 135 / 2.8 never got as popular is probably because they aren't really equivalent to 70 - 200 on FF. They'd have to be 50 - 135 / 1.8 in order to be really equivalent, including the same shallow depth of field as a 70 - 200 / 2.8 on FF.

It's similar comparing FF 24 - 70 / 2.8 with APS-C 16 - 50 / 2.8 lenses. Sigma seem to have realized this and introduced their excellent 18 - 35 / 1.8. It doesn't cover quite the same zoom range, but at least in the range it covers, it offers equally shallow depth of field.

Its bigger aperture also helps to combat the noise that most APS C sensors exhibit, making up - at least to some degree - the other advantage that FF still offers over APS C.

I hope Sigma soon complements the 18 - 35 / 1.8 by a 35 - 70 / 1.8 and ultimately by a 70 - 135 / 1.8 or 2.0.

Direct link | Posted on Sep 21, 2014 at 13:53 UTC as 52nd comment
In reply to:

Wing Wong: Hmm... "Class 3" UHS-I = 95MB/sec read and 85MB/sec write? Sandisk Extreme Pro UHS-I cards have been at that that performance level for a few years now. That, and I'm sorry, but have had too many crappy Transcend cards crap out on me. Sandisk all the way.

Wing.

Edit:

32GB Sandisk Extreme Pro cards for my camera. (95MB/sec read/write)
128GB Sandisk Extreme Plus card for my laptop/camera (80MB/sec read/write)

All of the Sandisk Extreme cards are rated against harsh environments as well. Have yet to have one fail on me.

Right, I really wonder what significance a card with read/write speeds of 95/85MB/s has 9 month after Toshiba announced their UHS-II cards with 260/240MB/s.

Direct link | Posted on Apr 5, 2014 at 10:28 UTC
On SD card labeling for 4K video announced article (50 comments in total)

To me, 30 MB/s sounds more like a major step back, my old 64 GB Extreme Pro UHS I already has a write speed of 95 MB/s. Strange.

Direct link | Posted on Nov 8, 2013 at 20:49 UTC as 21st comment | 4 replies

I hope is is not quite correct when DPreview writes above

"
All but the Sony mountS will incorporate Sigma’s proprietary Optical Stabilizer (OS) technology to compensate for camera shake. This functionality is omitted from Sony mounts to accommodate for that manufacturer’s in-camera image stabilization system.
"

because only Sony's A-mount cameras have in-camera stabilizers. The NEX and the new A7 series with the E-mount don't, so if Sigma will really omit the in-lens stabilizer from the E-mount version, too, it will be quite a show stopper.

Anyone on here KNOW any details?

Direct link | Posted on Oct 26, 2013 at 08:50 UTC as 11th comment | 5 replies
In reply to:

tinternaut: So what's the difference between this and the Canon equivalent? Are we looking at a very comparable lens, for potentially quite a bit less (once the prices stabilise)? The Canon 24-105 seems make the 6D kit quite a bit more expensive than Nikon and Sony equivalents (but then again, if I did buy Canon full frame, then for what I shoot, I wouldn't want to be without it).

We still have to see how well the new Sigma performs optically, but if we assume it is similarly good as Sigma's other "Art" lenses, then there is no real equivalent lens by Sony!

Direct link | Posted on Oct 26, 2013 at 08:44 UTC
In reply to:

Michaels7: I keep reading all of the negative post on the lens that hasn't even come out yet. Let's wait for it to hit the streets before critique it.

- sorry ...

Direct link | Posted on Oct 26, 2013 at 08:43 UTC
On Nikon D610 preview (627 comments in total)
In reply to:

Sad Joe: So so bored.....sorry Nikon & Canon ( I have BOTH so can dis BOTH too) this is simply a TINY improvement over the D600 and for most users makes no sense at all. Wake up Nikon - the game has moved on - its ALL about FULL TIME working AF with VIDEO - Cue the Canon 70D = the biggest step forward in DSLR cameras since the first FF Canon 5D. Most of the rest are just like the D610 a tiny step forward trying to gain as much cash from us photographers as possible.....

After reading the comparison of the 70D's video AF with the (much older!) Sony A77's SLT on DxOMark it should be clear that the 70D's Dual Pixel AF is also just a tiny improvement. After all it's results which count. Sony's SLT system is the only really revolutionary new design in SLR arena so far.

Direct link | Posted on Oct 8, 2013 at 20:41 UTC
On Nikon 1 AW1 preview (588 comments in total)

Nice try, but need better ... 15 m depth rating isn't even enough for snorkelling. I wouldn't mind an interchangeable lens system based around the CX sensor as long as I can take it down to 60 m and have at least 1 true wideangle lens, like the old Nikonos V with the 15 mm UW Nikkor. Although a bigger sensor camera with a (true!) phase detect AF and a couple lenses including a true macro would of course be better. And of course a strobe (or, better, 2) are mandatory for serious underwater photography.

Direct link | Posted on Sep 19, 2013 at 19:51 UTC as 75th comment | 7 replies

I wonder what the real sizes of these sensor are... normally 1/4 is 3.2 x 2.4 mm, at 5 MP (2582 x 1936 pixels) this results in a pixel pitch of 1.24 microns, resulting in a pixel area 22% smaller than what it would for the 1.4 microns claimed above.

Direct link | Posted on Nov 1, 2012 at 10:50 UTC as 2nd comment | 1 reply

Again, as already when introducing the HDTV "standard", the industry association fails to specify a minimum frame rate.

1080 @ 24p is already ridiculous, before we move to 4K we should really introduce a higher frame rate for the standard 1080p material that renders fast movements sharp AND smooth. IMHO this is much more inportant than increasing the resolution.

After trying 24, 30, 50 and 60 p with full HD resolution I would think the minimum should be around 72 fps. And for any upcoming 4K standard we should aim at a minimum of 100 fps, and 200 fps for 3D material so that the effective frame rate for full 3D reproduction remains at 100 fps.

Direct link | Posted on Oct 20, 2012 at 15:19 UTC as 11th comment | 5 replies

All tablets that I know lack a couple important features which I think are really mandatory before they "rightfully" deserve the term "tablet for photographers":

- a full size SDXC card slot (in addition to a micro sized one!), capable of UHS-1 speeds - and yes, I am aware that this requires accordingly fast and big internal memory (SSD), this is a sub-requirement which follows as a conclusion,

- an HDMI input plus app allowing to use the tablet as a larger (full HD) monitor on a DSLR when shooting video.

There's a couple more requirements but as long as these 2 aren't available I won't buy a tablet.

Did I overlook a tablet which offers these features?

Direct link | Posted on Oct 16, 2012 at 11:22 UTC as 34th comment | 2 replies
On Sigma 19mm f/2.8 on the NEX-7. article (9 comments in total)

How does it compare with the Sony 16mm pancake?

Direct link | Posted on Mar 30, 2012 at 15:22 UTC as 4th comment | 2 replies
In reply to:

Karl Gnter Wnsch: Unless they manage to produce sensors that can convey the *full* dynamic range of the scene (not just 6-7 EV in video mode like today, which is at least 20 stops short of the required range) and the EVF would manage to show the same dynamic range (the OLED is limited to about 5-6 EV) and that without lag and without heating up the sensor and without draining the battery... EVF is a solution to a non existing problem, OVF is and always will be superior, it's just hapless NOOBs which crave for the EVF solution as they lack the knowledge (and with an EVF they will never acquire this knowledge) to judge a scene.
EVF are incapable of showing the vital aspects in any high contrast scene - so they are a deal breaker for many!

I hope future EVFs will be backed by a signal processing with considerably higher color depth than 8 bit per color. 16 bit would be phantastic, but even 12 or 14 bit - color depths as used by today's DSLRs for the RAW image - would be a big progress. OLEDs can reproduce much bigger contrasts than LCDs, so in my opinion such a step would be necessary to take full advantage of these display's potential.

Direct link | Posted on Jan 29, 2012 at 13:30 UTC
In reply to:

Karl Gnter Wnsch: Unless they manage to produce sensors that can convey the *full* dynamic range of the scene (not just 6-7 EV in video mode like today, which is at least 20 stops short of the required range) and the EVF would manage to show the same dynamic range (the OLED is limited to about 5-6 EV) and that without lag and without heating up the sensor and without draining the battery... EVF is a solution to a non existing problem, OVF is and always will be superior, it's just hapless NOOBs which crave for the EVF solution as they lack the knowledge (and with an EVF they will never acquire this knowledge) to judge a scene.
EVF are incapable of showing the vital aspects in any high contrast scene - so they are a deal breaker for many!

Without doubt, the MicroOLED display we are talking about here has the potential of a big progress over existing EVFs (if it ever makes it into a commercial consumer camera). But one aspect is still neglected as it seems.

If it's true what the company writes, it has a contrast of 100000:1. Unfortunately, the company also says it supports 16 million colors. That tells me that they haven't understood the contrast problem in viewfinders yet. 16 M colors means a color depth of 24 bit, or 8 bit per basic color. With 8 bit per color you can differentiate only 256 brightness levels. With such a coarse stepping it is not possible to reproduce a 100000:1 contrast while still maintaining "very smooth transitional tones" as they write on their website.

Direct link | Posted on Jan 29, 2012 at 13:30 UTC
In reply to:

Karl Gnter Wnsch: Unless they manage to produce sensors that can convey the *full* dynamic range of the scene (not just 6-7 EV in video mode like today, which is at least 20 stops short of the required range) and the EVF would manage to show the same dynamic range (the OLED is limited to about 5-6 EV) and that without lag and without heating up the sensor and without draining the battery... EVF is a solution to a non existing problem, OVF is and always will be superior, it's just hapless NOOBs which crave for the EVF solution as they lack the knowledge (and with an EVF they will never acquire this knowledge) to judge a scene.
EVF are incapable of showing the vital aspects in any high contrast scene - so they are a deal breaker for many!

Also I love the low light capability of the A55's EVF. I shot with OVFs - good pentaprism implementations of Minolta's top models - for 25 years, but the fact that I couldn't see much in real low light situations always bugged me. For the advantage of being able to see, for the first time after all those years, a strongly brightened up version of a low light scene in the EVF I can easily accept that the picture that I get to see there is very noisy, and updates only a few times per second. At least I can see something!

You'll have to accept that for me the EVF is the answer to problems that did exist for along time, like it or not. And I know that I'm not alone. Your writing ("hapless NOOBs" ... "they lack the knowledge (and with an EVF they will never acquire ...") is so harsh that I was *VERY* close to clicking the "Flag as inappropriate" button. You insult all users of such cameras.

Direct link | Posted on Jan 29, 2012 at 13:29 UTC
In reply to:

Karl Gnter Wnsch: Unless they manage to produce sensors that can convey the *full* dynamic range of the scene (not just 6-7 EV in video mode like today, which is at least 20 stops short of the required range) and the EVF would manage to show the same dynamic range (the OLED is limited to about 5-6 EV) and that without lag and without heating up the sensor and without draining the battery... EVF is a solution to a non existing problem, OVF is and always will be superior, it's just hapless NOOBs which crave for the EVF solution as they lack the knowledge (and with an EVF they will never acquire this knowledge) to judge a scene.
EVF are incapable of showing the vital aspects in any high contrast scene - so they are a deal breaker for many!

I agree that dynamic range and brightness are rather limited in today's EVFs for very bright environment such as full daytime sunshine. I'm using a Sony A55 so I know what I'm talking about. At the same time I can say that even the A55 EVF offers advantages in other respects that compensate this disadvantage by far.

Before I bought the A55, I tried several other APS-C SLRs with optical viewfinders. But these viewfinders were all too small for me. The A55 is the first APS-C camera which overcomes this size limitation.

Direct link | Posted on Jan 29, 2012 at 13:28 UTC
Total: 21, showing: 1 – 20
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