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-1. Also interested in camera technology, e.g. Foveon. Also interested in computer based image analysis and transforms.

Comments

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On article This camera is made of 32,000 drinking straws (178 comments in total)
In reply to:

Elite83: Where's the camera? All I see is a big DIY honeycomb... there's no film nor sensor?

Where have you found the info regarding "color photographic paper"?

Link | Posted on Feb 17, 2017 at 21:20 UTC
On article This camera is made of 32,000 drinking straws (178 comments in total)
In reply to:

Roland Karlsson: It says in the text above that the first straw camera had an aperture of approx. F127.

First, 127 is a quite non approx. number. Just some nit picking :) Approx F100 had been more reasonable to say.

Second, this camera do not really have an F-stop number. It is a constant 1:1 macro camera, independent of distance. And the image gets darker the further away the subject is. So, an equivalent F-stop number would increase with distance. Not all that meaningful.

Maybe, if we shall be kind to the reporter or/and the people behind the camera, it could be equal to approx F100 for normal portrait distances.

Sorry - a typo. I try again.

It is actually wrong (or at least imprecise) to say that you set it to 400 ISO. To be exact you should really write ISO 400/27°. Where 400 is ISO linear 400 and 27 is ISO logarithmic 27.

Link | Posted on Feb 17, 2017 at 21:18 UTC
On article This camera is made of 32,000 drinking straws (178 comments in total)
In reply to:

Roland Karlsson: It says in the text above that the first straw camera had an aperture of approx. F127.

First, 127 is a quite non approx. number. Just some nit picking :) Approx F100 had been more reasonable to say.

Second, this camera do not really have an F-stop number. It is a constant 1:1 macro camera, independent of distance. And the image gets darker the further away the subject is. So, an equivalent F-stop number would increase with distance. Not all that meaningful.

Maybe, if we shall be kind to the reporter or/and the people behind the camera, it could be equal to approx F100 for normal portrait distances.

How about ISO 819200? The max of the latest Pentax.

If we shall more correct, both ASA and DIN are ISO.

ASA = ISO/linear
DIN = ISO/logarithmic

So, it is actually wrong to say that you set the camera at 400 DIN. You should either say you set it to 400 ASA or to 400 linear ISO.

Link | Posted on Feb 17, 2017 at 19:51 UTC
On article This camera is made of 32,000 drinking straws (178 comments in total)
In reply to:

Roland Karlsson: It says in the text above that the first straw camera had an aperture of approx. F127.

First, 127 is a quite non approx. number. Just some nit picking :) Approx F100 had been more reasonable to say.

Second, this camera do not really have an F-stop number. It is a constant 1:1 macro camera, independent of distance. And the image gets darker the further away the subject is. So, an equivalent F-stop number would increase with distance. Not all that meaningful.

Maybe, if we shall be kind to the reporter or/and the people behind the camera, it could be equal to approx F100 for normal portrait distances.

Yeah ... for it being interesting to say F/127, the inner diameter of the straw needs to b 2.00 mm. It probably is not that exact, so F/130 or even F/100 is probably more appropriate approximations.

Link | Posted on Feb 16, 2017 at 20:12 UTC

Strong photo!

Luck? Yes, partly. But ... it is his job to help and use the luck well.

Would you have taken that photo, being there?

Link | Posted on Feb 14, 2017 at 22:03 UTC as 56th comment
On article This camera is made of 32,000 drinking straws (178 comments in total)
In reply to:

acidic: This is really cool. It has inspired me to design a mobile app to create this effect. I will call it "INSTRAWGRAM"

Straw photography will no longer be limited to the artistic elite who have countless hours gluing straws together (some of us have jobs!). Everyone with a phone will be able to take straw photos!

I guess you are thinking of making a mosaic filter. Such already exists, e.g. in Photoshop.

But, it will only kind of look like straw photography. But, that is true for most simulating photo apps, e.g. soft focus.

Link | Posted on Feb 14, 2017 at 21:29 UTC
On article This camera is made of 32,000 drinking straws (178 comments in total)
In reply to:

Roland Karlsson: It says in the text above that the first straw camera had an aperture of approx. F127.

First, 127 is a quite non approx. number. Just some nit picking :) Approx F100 had been more reasonable to say.

Second, this camera do not really have an F-stop number. It is a constant 1:1 macro camera, independent of distance. And the image gets darker the further away the subject is. So, an equivalent F-stop number would increase with distance. Not all that meaningful.

Maybe, if we shall be kind to the reporter or/and the people behind the camera, it could be equal to approx F100 for normal portrait distances.

No, I would not call this a pinhole camera. Each straw is a kind of pinhole camera, but there is no picture at the end of the straw. So, it is no camera. The straws together catches a mosaic of no pictures. And as they are parallel, the mosaic image is always 1:1.

One thing I was wrong though is the F-stop. Your computation for the F-stop is correct. I did err in my thinking there. The straws will collect light from a bigger and bigger area the further away the subject get. And this is linear, so the exposure will be independent of distance.

Of course, this means that the image will get more and more blurry the farther away the subject is. So ... distant objects will be very blurry. And this is not due to diffraction.

Link | Posted on Feb 13, 2017 at 23:10 UTC
On article This camera is made of 32,000 drinking straws (178 comments in total)
In reply to:

Erik Ohlson: Hope it's not being done with Government grant money, but it probably is.

(face palm) - You do not know if those things have been financed. And actually, they are quite cool. And ... if they were financed, it is not important on any scale. At least not for you. What kind of planet do you live on?

Link | Posted on Feb 13, 2017 at 18:50 UTC
On article This camera is made of 32,000 drinking straws (178 comments in total)
In reply to:

Roland Karlsson: It says in the text above that the first straw camera had an aperture of approx. F127.

First, 127 is a quite non approx. number. Just some nit picking :) Approx F100 had been more reasonable to say.

Second, this camera do not really have an F-stop number. It is a constant 1:1 macro camera, independent of distance. And the image gets darker the further away the subject is. So, an equivalent F-stop number would increase with distance. Not all that meaningful.

Maybe, if we shall be kind to the reporter or/and the people behind the camera, it could be equal to approx F100 for normal portrait distances.

That is not how you compute F stops for this camera. Actually, it does not have an F stop as the image gets darker the further away the subject is.

Link | Posted on Feb 13, 2017 at 17:10 UTC
On article CES 2017: Hands-on with the Kodak Super 8 (425 comments in total)
In reply to:

Roland Karlsson: Maybe time to make a digital film camera that makes a buzzing sound while filming, where every frame is displaced slightly, that is now and then out of focus, with added noise, scratches, dust and graininess and where you have to hold the film button in during filming. And, of course, with bad colors. The realistic colors of normal digital cameras is of course unthinkable.

Actually, the buzzing sound might be a good idea. Also to be forced to hold the button in. It will add a tactile feeling. The major problem for me to film with compact cameras and phones is that I am not sure it is filming.

Oh no! Not digital film again! What's wrong with a digital movie camera.

Digital film catches the worst properties from both worlds.

Link | Posted on Feb 13, 2017 at 13:39 UTC
On article This camera is made of 32,000 drinking straws (178 comments in total)
In reply to:

Erik Ohlson: Hope it's not being done with Government grant money, but it probably is.

@Erik. Strange post. Some artists make something. Which is not at all unusual. And you are talking about how they have financed it? In a kind of accusing way? I assume you do not like art, or artists? Or, have some axe to grind. Or, what is the problem?

@brn. Does it matter? Artists can get governmental support in all countries. Nothing unusual at all. Like also sport. And theater. And ...

Link | Posted on Feb 12, 2017 at 23:31 UTC
On article This camera is made of 32,000 drinking straws (178 comments in total)
In reply to:

Lee Jay: I sort of have one made from 78,400.

I have a piece of this, in 1/4", that's 70" x 70" (it's actually 4 35"x35" sheets put together):

http://www.plascore.com/honeycomb/honeycomb-cores/thermoplastic/pc2-polycarbonate-honeycomb/

So ... you made a wind tunnel in the competition?

How did it go?

Link | Posted on Feb 12, 2017 at 23:22 UTC
On article This camera is made of 32,000 drinking straws (178 comments in total)
In reply to:

Lee Jay: I sort of have one made from 78,400.

I have a piece of this, in 1/4", that's 70" x 70" (it's actually 4 35"x35" sheets put together):

http://www.plascore.com/honeycomb/honeycomb-cores/thermoplastic/pc2-polycarbonate-honeycomb/

OK @Lee, I also assumed that you had made a camera. BTW - you should do one!

Link | Posted on Feb 12, 2017 at 18:47 UTC
On article This camera is made of 32,000 drinking straws (178 comments in total)

I see a kind of similar camera. You do not have 32K straws. Instead you have 10x15 = 150 square tubes. At the front of each such tube there is a lens. This lens have half the focal length of the length of the tubes. Then, at the same distance as the length of the tubes, the image will be sharp, 1:1 macro and will stitch quite well together.

What you will get is a macro orto photo.

One cool thing will be the bokeh. Unsharp things will be a 10x15 grid. Nothing you have ever seen before.

Link | Posted on Feb 12, 2017 at 14:25 UTC as 18th comment
On article This camera is made of 32,000 drinking straws (178 comments in total)
In reply to:

Roland Karlsson: Cool. Truly creative.

Not digital though. DPR is losing its focus quite often.

You need a diffuser at the back of the straws. Some matte plastics maybe. Then you need to shield the back from light, with some cone or something and then mount the camera at the opening of that cone, and then just take a photo of the image.

The matte plastic could also be a fresnel lens I assume. Would catch more light.

Link | Posted on Feb 12, 2017 at 13:40 UTC
On article This camera is made of 32,000 drinking straws (178 comments in total)
In reply to:

Lee Jay: I sort of have one made from 78,400.

I have a piece of this, in 1/4", that's 70" x 70" (it's actually 4 35"x35" sheets put together):

http://www.plascore.com/honeycomb/honeycomb-cores/thermoplastic/pc2-polycarbonate-honeycomb/

Yes, that would be interesting.

Link | Posted on Feb 12, 2017 at 13:35 UTC
On article This camera is made of 32,000 drinking straws (178 comments in total)
In reply to:

Wildbegonia: This is so amazing. Congratulations for an original project that shows the principle behind the pinhole camera. And it has an extra twist of ingenuity, its potential for recycling waste materials.

@PatMan. Technically you are correct. But, IMHO, it is uninteresting. Because, each straw "sub image" is as large as the pinhole, so there is no image att the bottom of the straw. Just even light. Which can easily be seen in the images.

You could put a lens (at the top of each straw), with a suitable focal length, so the subject is in focus. Then you would get 30K small images. But, then it would not be a pinhole camera at all. I guess that would be interesting though. Very strange bokeh.

Link | Posted on Feb 12, 2017 at 11:34 UTC
On article Flat metalenses now work with a range of colors (43 comments in total)
In reply to:

belle100: So in the future, we can really possible have credit card sized camera completed with 8-4000mm f/0.7 (500x) zoom built-in. Fantastic.

I sense some irony here. And that is right. This is a lens, and not a camera. The lens might be credit card size, just like some fresnel lenses are today. But ... the sensor needs to be somewhere. At the focal point maybe? And ... who have talked about zoom?

Link | Posted on Feb 11, 2017 at 13:40 UTC
On article Flat metalenses now work with a range of colors (43 comments in total)
In reply to:

EskeRahn: It could mean a real revolution in imaging in many ways. Will be interesting to see if it gets into real products, after we have used glass for centuries...

@dr.noise. And so were I. Maybe we both failed :)

It gets so complicated when several persons have different angles on the subject and also (like it seems) make no great effort to understand what is said. But, it does not really matter. What matters is to see if this technology ever gets to be used in our cameras.

Link | Posted on Feb 10, 2017 at 23:15 UTC
On article This camera is made of 32,000 drinking straws (178 comments in total)

It says in the text above that the first straw camera had an aperture of approx. F127.

First, 127 is a quite non approx. number. Just some nit picking :) Approx F100 had been more reasonable to say.

Second, this camera do not really have an F-stop number. It is a constant 1:1 macro camera, independent of distance. And the image gets darker the further away the subject is. So, an equivalent F-stop number would increase with distance. Not all that meaningful.

Maybe, if we shall be kind to the reporter or/and the people behind the camera, it could be equal to approx F100 for normal portrait distances.

Link | Posted on Feb 10, 2017 at 23:10 UTC as 29th comment | 15 replies
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