Roland Karlsson

Roland Karlsson

Lives in Sweden Stockholm, Sweden
Works as a Programmer
Joined on Feb 23, 2002
About me:

Collector of K-mount and M42 stuff. Main camera K-5. Also interested in camera technology, e.g. Foveon. Also interested in computer based image analysis and transforms.

Comments

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On Yongnuo creates near-clone of Canon EF 35mm f/2 article (165 comments in total)
In reply to:

The Name is Bond: Lenstip has a review of the the 50mm copy http://www.lenstip.com/425.1-Lens_review-Yongnuo_YN_50_mm_f_1.8.html

Actually - both the Yongnou lens and the Canon lens seems to be crap, according to this test. Just different kind of crap, and the Ypngnou slighly crappier. So ... whats the meaning behind all this discussion?

Direct link | Posted on Apr 25, 2015 at 12:06 UTC
On Yongnuo creates near-clone of Canon EF 35mm f/2 article (165 comments in total)
In reply to:

krassphoto: China doesn't give a dam'. Just like former USSR didn't. And nobody can do anything...

Totally irreklevant. A red herring. Making this lens is totally legal in any country, including US. The patent has expired. Moreover, using old known formulas for making new lenses is very common. That they have done this is only trivia. Nothing to get excited over. DPReview found something they thought fun - and wrote about it. And patent besserwissers took the bate, hook and all.

Direct link | Posted on Apr 25, 2015 at 11:44 UTC
On Yongnuo creates near-clone of Canon EF 35mm f/2 article (165 comments in total)
In reply to:

Juck: Can we assume it performs as well as their 50mm 1.8 clone? i.e. crap.

So - you bought a copy - and found it crap. That reviews do not agree with you do not bother you?

Direct link | Posted on Apr 25, 2015 at 11:35 UTC
On Yongnuo creates near-clone of Canon EF 35mm f/2 article (165 comments in total)
In reply to:

Juck: Can we assume it performs as well as their 50mm 1.8 clone? i.e. crap.

So - where did you get the notion of crap perfomance from?

Direct link | Posted on Apr 24, 2015 at 19:21 UTC
On Yongnuo creates near-clone of Canon EF 35mm f/2 article (165 comments in total)
In reply to:

Juck: Can we assume it performs as well as their 50mm 1.8 clone? i.e. crap.

Please @Juck, show us the evidence for crap performance.

Direct link | Posted on Apr 24, 2015 at 18:59 UTC
On Yongnuo creates near-clone of Canon EF 35mm f/2 article (165 comments in total)
In reply to:

Photato: Isn't this lens design protected by patents and such?
If the IQ is the same, it would be a great buy.

Trade dress is only relevant if someone might believe it to be a genuine Canon lens. And, in that case IMHO it is the consumer that is fooled and not Canon. In particular since Canon is not making the lens any more.

Direct link | Posted on Apr 23, 2015 at 21:42 UTC

The "two lands" time laps video is totall stunning. Not only is it beautiful, with all those fantastic polar lights and the views. The music is also very intelligently added. Usually I do not like music to beautiful videos. In particular piano music might be annoying. A total mis match. But here .... it hits exactly right. The dramatic parts matches the polar light movements perfectly. I can look and listen to it several times ... and I did.

Direct link | Posted on Apr 19, 2015 at 20:59 UTC as 20th comment
In reply to:

falconeyes: 7000 µm pixel pitch. wow! :)

Probably. But, if they have a solar cell on the thing and an ordinary small photo sensor, then you can take 10 1 MP image every second.

This toy is fun, but it is extremely inefficient.

Direct link | Posted on Apr 19, 2015 at 12:22 UTC
In reply to:

Roland Karlsson: Hmmmmm ... I was naive enough to assume the conventional BSI sensors were stacked like it is described in the article. I thought that was the entire idea behind BSI, not to let the circuitry decrease the real image area.

It seems like today's BSI do not have larger sensor area. The advantage is that the metal connections is behind the sensor instead of in front of it.

Direct link | Posted on Apr 18, 2015 at 23:18 UTC
In reply to:

tkpenalty: i hope thats not an excuse to jack up the pixel count. The cameras are so far beyond the diffraction limit its not funny....

Totally nonsens. Higher pixel count is good. And with those new stacked sensors, you lose very little in overhead area by increasing pixel count.

Direct link | Posted on Apr 18, 2015 at 16:03 UTC

Hmmmmm ... I was naive enough to assume the conventional BSI sensors were stacked like it is described in the article. I thought that was the entire idea behind BSI, not to let the circuitry decrease the real image area.

Direct link | Posted on Apr 18, 2015 at 15:58 UTC as 3rd comment | 2 replies
In reply to:

maxnimo: Duh! - Just cover the camera body with solar cells so it perpetually trickle-charges a battery or capacitor.

Yeah. But here we are working against the physical laws.

Using the sensor to power the camera might work, if we combine it with a battery that is charged whenever we not are taking pictures and then use the energy in the battery to take pictures while we not are charging.

Doing it at the same time will make it a worse camera and a worse energy collector.

Moreover, as I said above, it is much brighter outside of a camera box. So, putting solar cells on the outside is a brighter idea.

Moreover again, the sensor needs to be large to collect enough energy. A spy camera needs to be small. There is a conflict there.

Of course, it is a fun idea. And you never know where a fun idea will lead you.

Direct link | Posted on Apr 18, 2015 at 10:46 UTC
In reply to:

maxnimo: Duh! - Just cover the camera body with solar cells so it perpetually trickle-charges a battery or capacitor.

Moreover @Barney. The camera above is not a small factor camera.

Direct link | Posted on Apr 17, 2015 at 21:24 UTC
In reply to:

cgarrard: the gov could hide these nearly everywhere

It is rather big. You can make a much better and smaller camera with a regular micro camera and a solar cell and a battery.

Until shown otherwise, it is only a gimmick to use the image sensor to power the camera.

NOTE - it is much darker inside a camera box than outside of it. So - an external photo cell collects much more light.

Direct link | Posted on Apr 17, 2015 at 21:20 UTC
In reply to:

falconeyes: 7000 µm pixel pitch. wow! :)

It is a fun toy. Some researchers can amuse themselves and get payed. I do not think we shall take this too seriously.

BTW - if they use the charges in the sensor to power the camera, then they will lose information. Just saying.

Direct link | Posted on Apr 17, 2015 at 19:16 UTC
In reply to:

luben solev: What's the problem of having a camera with a conventional sensor and a separate solar cell of some type for the power?

Is this invention just about saving space over the above proposal? Or are there other advantages that I'm missing?

PS: Loving the self-reproducing memory quote, although I guess if it is permanently connected to the internet (tethered or wifi), it wouldn't need an ever-increasing amount of storage.

If it is tethered to Internet, it has all the power it needs already. If it shall use wifi, it needs more power. Neither is a use case for this camera.

Direct link | Posted on Apr 17, 2015 at 19:13 UTC
In reply to:

maxnimo: Duh! - Just cover the camera body with solar cells so it perpetually trickle-charges a battery or capacitor.

@Barney - no I do not think it would work at night. It says that it is self driven if you have enough light level.

A small camera with a solar cell and a battery is a better bet for a small surveillance camera.

Moreover, with that camera you might actually see what is filmed :)

Direct link | Posted on Apr 17, 2015 at 19:10 UTC
In reply to:

RichRMA: Hardly self-powered. Just more photovoltaic applications. Could be used to monitor wildlife for long periods, that kind of thing.

There already exist quite good cameras with photo cells that can take images for extended times.

Direct link | Posted on Apr 17, 2015 at 19:07 UTC
In reply to:

OrdinarilyInordinate: Great!
Knowing what I know now, I can't even imagine giving such a photo to my relatives. Most hate how high resolution modern cameras enhance their age-acquired flaws, including wrinkles and any sagging, and I've gotten a couple lectures from my mother, who still makes a doubtful disapproving face when I take out my camera, even though I now go over all her photos with a clarity-reducing and softening brush many times to remove over a decade of age--alas, I can't make her look half her age every time :)

This is not uncommon, but I think it is sad really. A wrinkled face is a wrinkled face. It is not ugly. What is ugly is if the person is dissatisfied with his/her face and/or life. I would say that going over this winning picture with a soften brush would be to destroy it.

Direct link | Posted on Apr 14, 2015 at 18:30 UTC
In reply to:

Roland Karlsson: @Midwest. Almost all images in almost al challenges gets a number of low points. Even incredible good ones. I can only speculate about the reasons for that strange fact. It could be that some puts high scores on the ones the like and low scores on all other. It could also be that some low scores are deliberately put on good images in order to make another good image win. Or it could be that the taste differs so much. There do exist photographers that deliberately make "tasteless" images and dislikes beautiful ones. And some of those photographers are very good. Such a person would put a 1 on a beautiful image.

One problem is that DPReview claims that the meaning of the numbers is insignificant, They have a magic algorithm that finds the winner anyhow. Personally I would like something like

1. Uninteresting or not belonging here
2. Not bad, but ... (default, if no vote)
3. Good, I like it
4. Very Good, I really like it
5. Outstanding, a clear winner candidate

No half points are needed, but they do not hurt either.

But, DPReview do not want to give us that help. I have a theoretical and programming background and I am sceptic about their magic formulas.

Direct link | Posted on Apr 14, 2015 at 18:16 UTC
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