Good day to all.
Not so long ago I unexpectedly discovered the fact that the phones are able to take pictures and do it very well. So good that they can even be used for creativity. Small matrix of course impose their own restrictions, but the results are very fit. Unfortunately I spoiled my older cameras soul could not put up with quite a terrible constraint - with optics. The phones have long been put only a wide-angle optics, and even with a focal about 28mm (in terms of equivalent 24h36mm frame). Me these lenses never liked - no normal person to remove or separate the background nicely.
Not only are these 28mm lenses considered a “normal” lens, they are also called longer telephoto lenses. It's funny to hear actually.
Therefore, the soul decided to inquire. And I found out that modern matrices in phones are by and large similar in size to an 8mm movie frame.
These are the same amateur 2x8 or Super8 movie cameras. And in the world of these movie cameras, there are absolutely delicious and interesting lenses. It's time to act!
For experiments, we took the old Ergo SmartTab 3G 4.5 device with a camera about 5 megapixels. Old, cheap and unnecessary. He understands very simply, spare parts can be found for a penny - an ideal candidate.
A native lens with a built-in IR filter, a protective glass of the camera was removed from the camera module and thus we got a bare matrix. Everything remained fully operational, only the lens will now need to attach your own.
They became the projection N-2 18 / 1.4. According to his characteristics, he promised to be at least curious thanks to aperture 1.4 and a longer focal length - as much as 18mm (the equivalent of 135mm for a 24x36 frame). It was already such a normal telephoto.
However, projection lenses have their own characteristics:
- lack of a diaphragm node (they simply do not need it)
- lack of a focusing unit (usually the lens simply moves inside its mount in the movie projector)
But this is not a barrier. You can always focus with your feet and hands :)
And the diaphragm is for wimps.
The lens was mounted on a platform with a camera hole and secured with plasticine. Yes, only profane people do this, but for preliminary tests this is enough.
Unless the focusing distance turned out to be small - about half a meter.
After trying on this projector, we got good results.
Despite a simple design (only 4 lenses), the lens produces good sharpness.
Although, of course, there is a soft effect due to the high aperture (this is the hobby of projectors, for which I love them). But this software is very nice (especially in color). Unless it's difficult to get into the depth of field - without the focus of picking on the screen, it is visually poorly visible and easy to miss.
Also, because of the poorly blackened lens ends, it is also commonplace for projectors to do so, the contrast is so-so.
In general, the idea of ​​using it to shoot something large-scale is very good.
The next step is to make normal fasteners and a focusing unit for shooting at greater distances.
Post has been edited10111 - 12.03.18, 23:03