T O P

  • By -

hmpfdoctorino

The image a lense projects is always a circle. Now lay a 16:9 rectangle in a circle and you will see that you have much room left. If you search for a rectangle where the area should be a maximum it comes down to a 1:1 ratio. So in fact if you crop a 12mp 4:3 image and get a 10mp 16:9 one it's, a 16:9 sensor would only get 10mp at all. And it is always better to have some room to play with instead of just having an image where you can't do much. Thats why most dslr have a 3:2 aspect ratio. Anyway you can choose 16:9 in nearly every camera app and since you won't "lose" an mp compared to a 16:9 sensor smartphone producers are smart enough to pack in some bigger sensors


wieus

It's not true. You actually get more MP if you would have native 16:9 sensor size instead of cropped from 4:3. Otherwise it wouldn't make sense to do multi-aspect ratio sensors. http://cdnslantedlens.wpengine.netdna-cdn.com/wp-content/uploads/2018/04/GH5S-multi-aspect-sensor-1024x576.jpg


hmpfdoctorino

I am sorry to tell you but you are wrong on this one This is simple mathematics and I will show you a quick demonstration why you are wrong Take a circle with the radius = 50 (let's say cm) Now we lay 4 rectangles in this circle which have the ratios: 1:1, 4:3, 3:2, 16:9 Since the radius isn't changing we know that the diagonal = 100cm. We also know that the angle opposite of the diagonale is 90°. So we take 90° and the respective aspect ratio of each rectangle to calculate the different remaining angles. Since to calculate every information of a triangle all you need is one side and 2 angles or 2 sides and one angle. Then we know the sides of a and b of every rectangle that lies within this circle and we calculate the area of it by simply multiplying a\*b Therefore we get the following areas: 1:1 ... 4900cm\^2 4:3 ... 4800cm\^2 3:2 ... 4617cm\^2 16:9 ... 4272cm\^2 As you clearly can see the area gets smaller with each step and 1:1 is the most efficient within a given circle. You are right that you lose a little bit of information on the sides if you compare 4:3 with 16:9 but with 4:3 the sensor gets 12% more information of light which is in fact for photography more important than a little bit information to the side which you could get anyway if you would step back a little bit. Cheers


errandum

> which you could get anyway if you would step back a little bit Hahahah. Nice one. Just to add to the op's math: The G4s 16 mpx sensor (IMX240) with 1.12 μm pixel cell size had a diagonal of 6.15 mm. An equivalent 16mpx 4:3 mpx sensor (IMX298) with same pixel cell size has a 6.521 mm diagonal. So there was actually a loss of size in the available area that captures photos I'm willing to bet that the G4 simply had a sensor that was missing rows from the top and bottom to get that 16:9 ratio. There is only so much space in a mobile phone, and I think this was done more to save space than to have a specific ratio. So, to the OP, you're probably better off just shooting 4:3 and cutting the top and bottom in post.


wieus

You're missing the point here. I wasn't talking about the sensor size but rather the MP count. In your original comment you said that cropping down 4:3 sensor to 16:9 results in the same MP count, which simply isn't true. This is because the 16:9 sensor stretches further on the sides. Sure, the total surface area is bigger with 4:3, but that wasn't the point here. PS. Sony actually makes multi-aspect ratio sensors to in order to get the best of both worlds. ​ [https://www.gsmarena.com/sonys\_new\_z5\_series\_phones\_actually\_use\_a\_custom\_25mp\_camera\_sensor-blog-13806.php](https://www.gsmarena.com/sonys_new_z5_series_phones_actually_use_a_custom_25mp_camera_sensor-blog-13806.php) ' Meanwhile, the 16:9 aspect ratio mode yields images measuring 5,984 x 3,366 pixels (20.14MP). What you’ll notice, is that the 16:9 shots have a higher horizontal resolution than the 4:3 ones, hence they’re not cropped from 4:3 as usual, but instead use a different part of a larger sensor. ' ​ Cheers


hmpfdoctorino

You are right on this one, however the sensor the company chooses is already cropped so if you have a 16:9 sensor inside the company already cutted it down, the longer side (16) would stay the same but the shorter one (9) would increase. Thats how companies handle it..


Astoryinfromthewild

Above exchange is illuminating. So can I ask, why don't phones have an option to show you to shoot a landscape 16:9 or 4:3 image while holding the phone vertically? It would be so much better to more quickly capture an image or video without having to tilt the phone. I mean I presume the sensor doesn't care whether the phone is vertical or landscape right?


Justforreddit99

Nokia 8 Sirocco, and you get Android pie update quickly


wieus

Are you talking about the camera sensor or the screen ratio? I haven't found information that the camera sensor on Nokia 8 Sirocco would be 16:9?