Experimenting with depth of field

Playing with the Christmas decorations is not an activity reserved for cats. When I tested the Petri 7s for the first time in the beginning of December, I noticed how good the lens seemed to be. Even though my test then showed that the camera had seen better days, the f1,8 lens turned out to give very nice, details and I decided to shoot some frames to test it out. I decided to go with the Christmas, or actually Advent, decorations. I lit a candle in a glass candle holder, and let that work as a foreground, and I placed the rest of the decoration approximately 80cm away from the lens, which would be the closest focus length for this camera.

My setup. Petri 7s on a black glass plate with the decorations. I have taped the camera because the back has a tendency to «pop open» at any point.

I went with shots at f1,8, f4 and f16 to see how much difference there would be in sharpness and how they would turn out. I did not change the lighting conditions, but I adjusted my shutter speeds to compensate for the smaller aperture. for the f16 image, that was two and ha half minutes with compensation for the Schwarzschild effect.

All in all I think the lens gave me the results I anticipated. The f1,8 gives me a very nice bokeh, but the focus is a little bit off, so maybe the focus ring isn’t as accurate as I would hope for. The f4 image gives more sharpness and retains the nice bokeh feel, and the f16 gives a very sharp image.

The mood changes a lot between the images, and I am not sure which one is my favorite. You can make a judgement yourself, and I hope the images are to your liking.

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