thinkfat

thinkfat

Lives in Hessen
Works as a Project Manager, Linux Hacker
Has a website at http://thinkfat.blogspot.com
Joined on Jan 23, 2009
About me:

Go to Italy. Be a cobbler.

Comments

Total: 89, showing: 1 – 20
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In reply to:

Paul Guba: Surprising no one is talking about the use of LED in flash unit. I find that much more interesting then the duration.

Yes, they're called "smartphones".

Direct link | Posted on Dec 2, 2014 at 14:22 UTC
In reply to:

TLD: Am I right in thinking that Yonguo strobes do not do e-TTL?

No

Direct link | Posted on Nov 22, 2014 at 06:37 UTC
On What is equivalence and why should I care? article (2071 comments in total)
In reply to:

quezra: One thing this article doesn't mention is that as sensor tech improves, your lenses are basically getting faster. Today's gutter standard f2.8 lenses can outshine the f/0.95 lenses of yesteryear because you couldn't push film beyond ASA 800 much (aside from being very expensive). When people complain some new 50/1.8 lens isn't "fast" it is actually a whole lot faster than a 50/1.4 lens from just 5-10 years ago because of digital improvements on the sensor. A "slow" FF kit lens (f/3.5-5.6 usually) producing indoor nighttime ambient light shots would simply be unthinkable 5 years ago.

@Death89: no, a better sensor cannot capture more light than is projected by the lens. Which is given by the geometry of the lens and the attenuation of the glass elements. The usable ISO of the sensor doesn't at all matter for the "equivalence" explained by the article. It's a nice side effect of digital sensor technology to allow higher ISO than film and thus allowing higher shutter speeds with a slow lens (and maintaining a decent level of noise).

It's not that the better sensors are capturing more light in that situation, they can just make do with less. Faster shutter at same aperture -> less light, full stop. If you don't assume that, the whole equivalence of the article goes "puff", and if you do, the ISO becomes irrelevant for the argument. That's why I said it's rightfully been left out.

So this doesn't affect the image the lens projects. And therefore a f/1.8 lens doesn't become a f/0.95 lens, for all the article requires.

Direct link | Posted on Jul 17, 2014 at 15:07 UTC
On What is equivalence and why should I care? article (2071 comments in total)
In reply to:

Lights: The only part of Equivalence that I have a difficult time in understanding is why would more light fall on an equal sized cropped area of a larger sensor, if the sensors were of the same exact design, than on a cropped sensor? with the same exact lens? at the same aperture? Yes for an equivalent FOV with different lenses I can understand that more light would fall on the larger sensor, since the entrance diameter of the lens would be larger. All the other stuff I can understand more easily, the DOF being different, diffraction being different...and of course FOV. I'm not trying to argue, but rather trying to understand...or perhaps no one is really saying this ;-)

"Why would more light fall on an equal sized cropped area of a larger sensor, if the sensors were of the same exact design, than on a cropped sensor?"

You may have a difficult time understanding that, because it simply is not so. The cropped sensor behaves exactly the same as if you cropped the image from a larger sensor.

Direct link | Posted on Jul 8, 2014 at 12:56 UTC
On What is equivalence and why should I care? article (2071 comments in total)
In reply to:

quezra: One thing this article doesn't mention is that as sensor tech improves, your lenses are basically getting faster. Today's gutter standard f2.8 lenses can outshine the f/0.95 lenses of yesteryear because you couldn't push film beyond ASA 800 much (aside from being very expensive). When people complain some new 50/1.8 lens isn't "fast" it is actually a whole lot faster than a 50/1.4 lens from just 5-10 years ago because of digital improvements on the sensor. A "slow" FF kit lens (f/3.5-5.6 usually) producing indoor nighttime ambient light shots would simply be unthinkable 5 years ago.

The article doesn't mention it, because it has nothing to do with the topic. It's also wrong.

Direct link | Posted on Jul 8, 2014 at 12:50 UTC
On What is equivalence and why should I care? article (2071 comments in total)
In reply to:

falconeyes: 18 hours ago, David Jacobowitz made an argument that this article should cite work which helped evolve the concept of equivalence (or how I call it, the equivalence theoreme).

To this end, I observed that the concept was missing in internet discussions dated 2007, Jan 11. At that time, Daniel Buck in http://www.fredmiranda.com/forum/topic/544062/ described the Brenizer method on the Fred Miranda forum (actually before Ryan Brenizer "invented" it; he did not). The effect is easily understood using equivalence (stitching effectively creates a larger sensor). Yet, the fredmiranda discussion fails to recognize this relation and does a poor job explaining the effect or compute its effective aperture.

Therefore, I think it is safe to assume that the equivalence theoreme was discovered after 2007 January. Moreover, this is a nice example how useful the equivalence theoreme actually is ...

Exactly. Everyone with a basic understanding of math can do it. I involves no more than +-*/

Direct link | Posted on Jul 8, 2014 at 12:47 UTC
In reply to:

iShootWideOpen: There is nothing special about any of the Schneider lenses made for the Phase mount. The Hassy H lenses are superior in every way.
While Leica and Zeiss are the Porsche and Mercedes of the optics world, Schneider is VW.

You forgot that VW owns Porsche.

Direct link | Posted on Jun 3, 2014 at 08:45 UTC
In reply to:

kabam: It is called the Art of Reverse Engineering. Sigma and other companies use reverse engineer to sell Sigma lens for Canon, Nikon, etc. Magic Lantern user reverse engineer to allow/expose more Canon camera functionalities.

It is okay for large corporation to do it but it is not okay for a graduated to do it?

"Reverse Engineering" is certainly something else.

Direct link | Posted on May 29, 2014 at 20:19 UTC
On Sigma 50mm F1.4 DG HSM | Art Lab Test Review preview (567 comments in total)
In reply to:

thinkfat: This appears to be a very positive review. At least it seems to me, because "positive" is positively used in every second or so sentence.

Regarding the lens, I'm genuinely positive.

Yes, but what is a "large, positive focus mode switch". And how does a grip provide "positive handling when changing lenses".

Direct link | Posted on May 28, 2014 at 19:03 UTC
On Sigma 50mm F1.4 DG HSM | Art Lab Test Review preview (567 comments in total)

This appears to be a very positive review. At least it seems to me, because "positive" is positively used in every second or so sentence.

Regarding the lens, I'm genuinely positive.

Direct link | Posted on May 28, 2014 at 14:59 UTC as 100th comment | 4 replies
On Get more accurate color with camera calibration article (208 comments in total)

Additional information for Linux users:

argyllcms has support for the XRite ColorChecker Passport since some time. This is your choice if you need a standard ICC profile for Digikam or Darktable.

Direct link | Posted on Apr 28, 2014 at 08:47 UTC as 76th comment
On Windows XP is dead. Long live Windows XP 'Bliss' article (123 comments in total)
In reply to:

brycesteiner: I have a hard time believing it was not adjusted digitally. Perhaps not by the phtoographer, but maybe by MS. They like to oversaturate even more than Olympus does.

One word: Fujichrome!

Direct link | Posted on Apr 15, 2014 at 08:01 UTC
In reply to:

munro harrap: In case you wombles do not know, photographer is the no 1 most dangerous profession. The percentage killed relative to the total number makes it so.It is an occupational hazard, and everyone who goes unarmed into a war to record it knows this. No ideology is involved, no politics are needed to cloak mass murder, but unfortunately her generation were inspired by a few in mine who fancied what they did made a difference.

Recording conflicts we in the West started ourselves was a futile irony that just never occurred to them strongly enough to keep them at home safe with their terrified stressed families and friends.

How many more?

Not sure why I should feel insulted by being called a "Womble"?
http://en.wikipedia.org/wiki/The_Wombles

Direct link | Posted on Apr 4, 2014 at 19:53 UTC
On 900MP portraits show human face in extreme detail article (288 comments in total)
In reply to:

rfsIII: What is also interesting is that if you look at high magnification views of some of the bug pictures, he is coming really close to the resolving limit of that particular camera and lens system. So now we know what the modern DSLR is capable of.

And as for the why of this..two reasons: Art and commerce. I'm betting he shoots the faces for personal satisfaction but there is a solid niche market for high resolution photos of art works, and you can see on his site is part of what he does.

Not only for archiving purposes, there is a quite a market for high quality prints of old masters paintings, too.

Direct link | Posted on Mar 21, 2014 at 08:46 UTC

OMGee, it's full of trolls.

Direct link | Posted on Jan 16, 2014 at 21:41 UTC as 6th comment
In reply to:

petepictures: It does look sharp wide open

So, what do you expect exactly? If you look at the test at photozone and see how much effort went into correcting aberrations you'll understand where the price comes from. Would you spend the money on the new Nikon 58mm prime? If yes - this PanaLeica lens is in the same IQ ballpark.

Direct link | Posted on Jan 9, 2014 at 19:43 UTC

I wonder where the photos were taken? Some look familiar, especially the Christmas market, could be Nürnberg?

Direct link | Posted on Jan 3, 2014 at 06:39 UTC as 12th comment
On In photos: The beauty of bees article (49 comments in total)
In reply to:

racketman: try these live bee stacked shots, you can't beat natural light:

59 stacked shots:
http://www.flickr.com/photos/johnhallmen/6070630712/in/faves-tobyjug5/
95 stacked images
http://www.flickr.com/photos/99704562@N08/9580314169/in/photolist-fAzBCv-bL4pbR-eoJ2Y6-awKF4V-dzCinW-fWVJKd-9TcHfP-cqXK9y-bDVzm3-egNMNS-eJa2rD-aDB14n-d766ss-9XWVX5-9XCKnc-9XCJT2-aDERDh-cuKcNq-efeAbL-efeAch-csdibs-bCzyBv-exowa4-exowbp-exow8X-exow7t-exowaF-ctymAE-akbHVe-ekeVdR-9zhk9o-aky1vJ-eAQMNU-eAQKQW-bzzQZ1-bzzQZ5-czyoYA-efeAdy-c1w7Ty-bQsMyV-bQJ4xM-bQJ4ya-c1w7Ud-efin1a-fWaQcy-fWaQco-fWaQ7d-fXdARS-efin1r-fWaPXq-fXdAJY

Did you deep-freeze the poor thing to make it stand still and pose?

Direct link | Posted on Jan 2, 2014 at 21:53 UTC
On Nikon AF-S Nikkor 58mm f/1.4G review preview (413 comments in total)

Pretty good. But from a price/performance point of view I'd probably get the Sigma. Moving some CA control sliders is not that bothersome after all.

Direct link | Posted on Jan 1, 2014 at 09:22 UTC as 67th comment
On Nikon Df Review preview (1627 comments in total)
In reply to:

sunhorse: I do not understand the people who hate a camera they've never handled or used, and will never buy.

Happy Holidays everyone!

Though the question stands what the "real deal" would be. An intelligent blonde with real boobs? A brunette? with fake boobs or without? Complaining to a camera maker for not fulfilling ones' secret dreams is like complaining to Santa for not delivering that house you put on your wish list.

Direct link | Posted on Dec 22, 2013 at 08:49 UTC
Total: 89, showing: 1 – 20
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