oscarvdvelde

oscarvdvelde

Lives in Spain Castellgalí, Spain
Works as a lightning research
Joined on Apr 29, 2006

Comments

Total: 78, showing: 1 – 20
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On New samples from the Sigma 24mm F1.4 DG HSM Art lens article (213 comments in total)

Should be interesting to see how it compares against Sigma's old 24mm f/1.8 EX and the Samyang 24mm f/1.4 also.

Direct link | Posted on Feb 20, 2015 at 02:27 UTC as 36th comment | 14 replies

I bought the Tokina 16-28mm f2.8 in 2011. Build quality and quality control are not good: 3 samples I tested were decentered. The 3rd one was quite acceptable and I kept it. Half a year later an internal screw got loose and the lens mount wobbled. Sent it in for repair. It came back with some internal lens group play resulting in unpredictable sharpness across the image. If that wasn't enough, the zoom ring has half a centimeter of slack now before it actually zooms. Also, on rare occasions the autofocus motor ran wild, had to remove the battery from the body to stop it (EOS 5D). Test and buy where you can easily return it without shipping.

Direct link | Posted on Feb 15, 2015 at 03:24 UTC as 30th comment | 4 replies
On CP+ 2015: Canon shows off prototype 120MP CMOS sensor article (255 comments in total)
In reply to:

oscarvdvelde: It is only 1.5 times the resolution of the 5DS. Explain the drama?

Megapixels is nice for marketing, because it increases with the square of the resolution. If you print at 150 dpi and you really want 300 dpi at that size, i.e. 2x the resolution, you need a file with 4x the megapixels. But I'm not telling anything new here.

It seems the video community corrected this. Why not apply it in photography as well? Because differences of 6K vs 4.9K vs 4.4K aren't selling so well as 24 MP vs 16 MP vs 12.8 MP...

Direct link | Posted on Feb 13, 2015 at 22:40 UTC
On CP+ 2015: Canon shows off prototype 120MP CMOS sensor article (255 comments in total)
In reply to:

oscarvdvelde: It is only 1.5 times the resolution of the 5DS. Explain the drama?

Note that even Canon claims "60 times the resolution of full HD". This is just marketing talk. You can resolve 13280/1920 = ~7 times finer details.
The likes here serve almost as a DPreview ignorance meter. Why not do the math yourselves?

Direct link | Posted on Feb 13, 2015 at 20:05 UTC
On CP+ 2015: Canon shows off prototype 120MP CMOS sensor article (255 comments in total)
In reply to:

oscarvdvelde: It is only 1.5 times the resolution of the 5DS. Explain the drama?

Even the responses above are awkward. My math is fine: 13280/8868 pixels = 1.4975
Resolution is resolution. It's measured in linear dimensions.

Direct link | Posted on Feb 13, 2015 at 18:32 UTC
On CP+ 2015: Canon shows off prototype 120MP CMOS sensor article (255 comments in total)

It is only 1.5 times the resolution of the 5DS. Explain the drama?

Direct link | Posted on Feb 13, 2015 at 16:47 UTC as 39th comment | 18 replies
On Canon EOS 5DS / SR First Impressions Review preview (2269 comments in total)

Wow, the same rage here as when Canon introduced the 5D mk II, the first camera with over 20 MP! As if Canon has made all recent cameras obsolete now ;)

Direct link | Posted on Feb 6, 2015 at 14:16 UTC as 409th comment
On Go wide! Hands-on with Canon's 11-24mm F4 L article (224 comments in total)

that front element will take an hour to clean after taking it to the beach on a stormy day :)

Direct link | Posted on Feb 6, 2015 at 04:20 UTC as 74th comment

The site seems to be down for many hours now. Keep getting this http://www.worldphoto.org/FatalError.html?aspxerrorpath=/default.aspx/
I can't submit anything before the deadline.

Direct link | Posted on Jan 5, 2015 at 23:39 UTC as 1st comment
On Entry-Level Mirrorless Camera Roundup (2014) article (138 comments in total)
In reply to:

marc petzold: Virtually, besides the X-M1 vs X-A1, the only difference is, that the A1 is way cheaper, but build into the same package (body) and uses a ordinary Bayer Sensor, not X-Trans...but that comes in handy especially when shooting landscapes and foliage, the X-Trans Sensors don't look too good into that way for my eyes, apart that, they're very fine, indeed.

But i must say that i would mention, the X-A1 and X-M1, both do have also a plasticky feeling like the A3000, and being far away from for instance a X-E1(2) or X100-alike Body, which are made out of alu magalloy, and not plastic.

Try this: download the RAF file of the river at this page: http://www.fotopolis.pl/n/17408/fujinon-xf-27-mm-f28-test/?page=14 and open it in RawTherapee. It's full of details in the green, freaking amazing. This totally removed my doubts about X-Trans. But the OOC JPEGs I see everywhere (and many say are "sharp" unfortunately lack that detail. Just like Canon JPEG vs raw.

Direct link | Posted on Dec 18, 2014 at 04:51 UTC

Looking at the full gallery, the panel will have a hard time going through the images. Of the 10 pages only a minority of submissions qualify as scientific photography.
http://rps-science.org/competition/all/International-Images-for-Science/entries/?page=10&sort=&category=&competition=1

Direct link | Posted on Dec 7, 2014 at 23:22 UTC as 1st comment | 1 reply
On Casio targets golfers with Japan-only Exilim EX-FC500S article (36 comments in total)
In reply to:

oscarvdvelde: A few years ago Casio had unique features I would still like to see in cameras from other manufacturers. You could actually press the shutter or record button after an event (e.g. sports, children or animals, lightning) and save the images or video of the action!

The difference is this. Instead of recording all video to storage media, the camera stores images in a circular buffer (when you "arm" or "pretrigger" it), which may be a second worth of video, for example. When you press the trigger upon seeing the action you were waiting for, the buffer stops filling. You may then further reduce the selection and save that to card. This is also how high speed camera systems work like Vision Research Phantom cameras.

Direct link | Posted on Nov 25, 2014 at 03:58 UTC
In reply to:

srados: Hey Canon, Sony just imagined impossible...

Canon was looking at Sony's factory and saw impossible.

Direct link | Posted on Nov 20, 2014 at 22:30 UTC
In reply to:

Auricom: SONY: does hearing that name send euphoric energy ripples up and down your spine? /:o

it still sounds like Walkman, Handicam, Trinitron and My First Sony to me. It's hard to shake off.

Direct link | Posted on Nov 20, 2014 at 22:25 UTC
On Casio targets golfers with Japan-only Exilim EX-FC500S article (36 comments in total)

A few years ago Casio had unique features I would still like to see in cameras from other manufacturers. You could actually press the shutter or record button after an event (e.g. sports, children or animals, lightning) and save the images or video of the action!

Direct link | Posted on Nov 19, 2014 at 13:12 UTC as 8th comment | 6 replies

1100g! My Tokina 16-28mm is 950g which makes for an awkward and tiresome carrying experience. But potentially this lens is even more interesting by the addition of stabilization. If the coating eliminates flare it will be a huge advantage over the Tokina, which is prone to green reflections all over and rainbow patterns around bright lights at night.

I shall hope Tamron has a better build consistency and quality control than Tokina. In 2011 I've sent 2 Tokinas from the shop back after testing, they were too decentered. The third I kept but some screw holding the mount inside the lens failed after a year. When it came back from Tokina service, some optical group is loose, resulting in good or bad focus accuracy depending on lens tilt. In a few rare cases the lens autofocus motor went wild on my Canon 5D, cured by removing the battery from the camera.

It also looks like the Tamron avoids the AF/MF focus clutch (focus ring pull action) - a good thing!

Direct link | Posted on Sep 12, 2014 at 17:09 UTC as 26th comment | 3 replies
On Fast and full-frame: Nikon announces 24MP Nikon D750 article (406 comments in total)

This seems what I wanted the 6D to be. Tilting screen, great for timelapse, wide dynamic range at low ISO, highlight-weighted metering.
Still shooting the old 5D till Canon comes with something like this. Except Canon only updates the full frame cameras every 3-4 years...

Direct link | Posted on Sep 12, 2014 at 06:31 UTC as 58th comment | 16 replies
On Opinion: Do we really need the Fuji X30? article (310 comments in total)

This update doesn't look as minimal as Canon 20D to 30D (picture style + bigger screen only). In fact if Canon would have made a tilt screen on the 6D and not have made HDR raw saving and other software limitations compared to 5DmkIII I would likely have bought it already as upgrade from my old 5D. The same logic applies if I were looking for a X20/X30 type of camera. X30 is more attractive to me.

Direct link | Posted on Sep 1, 2014 at 03:49 UTC as 10th comment
On What is equivalence and why should I care? article (2087 comments in total)
In reply to:

gianstam: About total light.
So, I have a question to DPReview?
Do the Sony and Nikon FF cameras produce different noise at pixel level when used at different formats for the same sceen?

My point of view: the sensor does not behave as a whole.
The electric signal from each photosite is not affected by the the total light.
Sensor is not a sun light collector (larger surface, more electric power).
Image (and noise and DR) is produced by pixels. Same tecnology and size pixels produce the same results.
So the advandage of the larger sensor appears not because of the more light but because of the more (same sized) pixels or because of the larger pixels (for the same Megapixel sensors).

Very informative article by the way.

veroman - this is because you can allow your pixels to be larger for the same resolution or have more of them (higher resolution, less magnification per pixel) without shrinking them.

Direct link | Posted on Jul 7, 2014 at 22:15 UTC
On What is equivalence and why should I care? article (2087 comments in total)

Sensors don't read out the total amount of light. They read individual pixels. If the light per square mm is equal (same f-stop) and the pixels are the same size and quality, the same gain will be applied. For the smaller sensor this however results in fewer megapixel image, effectively a direct crop of the larger sensor, in which any noise is identical but more magnified in the smaller sensor.
But typically the smaller sensor will have a similar megapixel count (final magnification), reached by a larger pixel density. The light per square mm is then divided over more pixels in the small sensor case, resulting in fewer photons per pixel. In order to produce the same RGB values for the same exposure (shutter and aperture) the gain needs to be increased which leads to more visible noise and loss of highlight range. The ISO value relates simply scene lighting, exposure and RGB result, so the small sensor in this example has more gain applied for any given ISO.

Direct link | Posted on Jul 7, 2014 at 21:14 UTC as 292nd comment
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