Drawing on a matrix

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I am not a professional photographer. At the same time, I have to be in the student state all the time. Nothing helps learning as much as practice and experiments.

One day I read information about shooting objects using variable focal length. This is when, at the moment of pressing the shutter, you start changing the focal length of the lens. And I decided to give it a try... What I can do.

I have one 55-210 lens. It is designed for a 1.5 crop matrix, but I have a full matrix. This means that in fact I have the equivalent of about 80-300.

Two days ago I got to the historical center of the city with beautiful houses and by chance I had this lens with me...

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CameraSony A7М2
LensSony 55-210
Post-productionin LR


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Beautiful zoom-bursts, bravo.
I also experiment now and then with this technique, especially at night it creates beautiful long exposures, sometimes very artistic...

By the way, I think with the focal length it is the other way around ;)
For instance, I have 50mm prime lens for full frame (35mm sensor) and when I put it on a crop sensor (Canon's ratio is 1.6) then the focal equivalent length becomes 80mm, a bit better for portraits ;)

!PIZZA

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An interesting point with the recalculation of the focal length. It looks like it works both ways.
If I shoot with my lens at 22 (according to the lens layout), I get a frame in the central part and a large vignette.

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If I crop this frame before the vignette disappears, then I get a much larger image.Yes, it will be smaller in pixels than for a full frame, but it looks to me like an enlargement of the photo size. It's like creating a pseudo macro :)

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For this reason, I am talking about increasing the focal length, although in reality this is not the case. The real increase is obtained in your case :)

Cheers and !BEER
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Ah, now I see what you mean.
Canon has a hardware feature that prevents from putting a crop lens on full frame camera bodies. Of course, this could be sorta hacked but I wouldn't do this, I've heard stories of people damaging their camera bodies.

!PIZZA

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(Edited)

SONY's system cameras have a reverse APS-C function. It allows you to adapt the crop lens to the full matrix. More precisely, to what you see in the viewfinder. Part of the area of the matrix around the perimeter becomes inactive, but you see the picture on the whole screen and it turns out the enlargement of the visible picture. It's like if you put another lens with a longer focal length.
That's the point I had in mind. It turns out that SONY cares more about users :))

And today I bought a lens with a focal length of 1000...

Cheers and !BEER
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That's quite interesting but I am 100% sure it comes with decreased quality when using crop lenses on full frame sensors. It is much more flexible though.

Oh, 1000mm. That must be a monster :D

Congrats!

!PIZZA

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Not really. The picture does not stretch to the entire full frame (then the quality will definitely drop). It just involves the part of the matrix that corresponds to the crop. But at the same time in the viewfinder / screen you see a normal full picture without this black vignette. This is convenient for building a frame.

The monster weighs 3.4 kg... :-)))

Cheers and !BEER
!invest_vote

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What I meant by decreased quality is that usually the lenses made for smaller sensors are made with cheaper and smaller optical elements because they are designed to cover smaller sensor area. Of course, that is only when comparing to similar lens for full frame, by the same manufacturer ;)
My heaviest lens is only 2.8 kg :D 100-400mm for full frame :)

!PIZZA

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I can't say anything about the quality of the lens glass itself. Such data is usually not published. But maybe you're right. However, the full frame appeared relatively recently, and smaller sensors were released a long time ago. It was then that sensor manufacturing technologies developed and the area increased. I think that lenses that were made before full matrices did not save on the quality of glass for lenses.. They needed to conquer the market and everything was made from the best materials.

Perhaps this is true for modern lenses. Now they are trying to save on many things.

Cheers! & Thanks!

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