Aparture comparation from f 1.4 to f 16.0 with canon fd 50mm 1.4 SSC

Aparture that creates bokeh, this is a consideration when I think about a big aparture. How much differences are there between each aparture range? Luckily my cousin lend me an antique canon lense, a 50mm f 1.4 canon fd SSC. Hey, that's a great opportunity to satisfy my curiosity.

Ok, let's begin! Here's my settings to the equipment. A tripod. A GF-1 camera lens plus a 50mm manual fd 1.4 and an adapter. Iso was set to 100. The distance to the object about 60 cm, as well as the distance to the background object. Due to the manual setting and old lens, the existing aparture record is not listed on the image properties of each image. There was only iso and shutter speed records. 

For  the determining the apartures, I see directly from the numbers listed on the lens.  1.4-x-2-x-2.8-x-4-x-5.6-x-8-x-11-x-16 (x is a value that is not written on the lens). This x number probably not to accurate since it's not detected in the LCD panel, but hopefully it will not be more than 1 stop. The focus of the lens is on the lens cap. The photos maybe small but you can enlarge the photos anyway.

As seen in the first part is the image of aparture range from 1.4 to 2.8. These apartures are quite fantastic in my opinion. Look at the isolation of the object from f 1.4 - f 2.0, every object outside the focused lens cap, they all started to blur. Even the side edge of the table behind went completely blurred. At f 2.5 - f 2.8, the internal flash Canon writings began to appear clear but still the background behind went blurred badly. Great bokeh.

In the second part of the photos taken from f 3.5 to f 6.3. As we know f f 3.5 is standard on the kit lens included in the sales package in general. For the shooting conditions like this,  f 3.5 still has a considerable level of blur in the background. In fact this applies to f 4.4. But if you look closely, at f 5.6 to f 6.3 line behind the desk began to appear. And the photos are starting to look dark. This is despite exposure to fall on the zero point. Look at the shutter speed for thos aparture levels. Yes, since f 4.4 to 6.3 stops in 1 / 10. No wonder even if the EV pointing to 0, the photos produced are rather dark.

The third part is from the range of f 8.0 to f 16.0, the maximum aparture limit of 50mm canon fd 1.4. Starting from f 6.3 to f 16.0 the photos produced tend to be dark. And shutter speed dropped dramatically except at f 8.0 that for some reason it has the same speed as f 6.3. At f 10.0 the border between the glass and the desk starting to look clearer. Sharper image but darker at overall.

After seeing all three rows of images, we can see the bokeh differences produced between each aparture. Sometimes a big aparture helps us to isolate the object but sometimes we need a smaller aparture to obtain the desired detail. In a larger scale, the difference in the distance lens to the object and the background will produce different results.