Using a lens adaptor I attached the Pentax lens to my Sony dslr. The lens has a min aperture of f1.7 and a max aperture of f22, and has a 50mm focal length.

The lens I normally use has a min aperture of f3.5 so having an aperture as low as 1.7 was nice. I found this was amazing for capturing portraits on top of Snowdon but also good for macro photography

Due to the lens having a max aperture of f22 it was perfect for capturing slow shutter-speed. I set the camera to iso 50 and experimented with shutter-speeds

This lens was very versatile and took beautifully vignetted images with interesting bokeh. I would still not use this on one of my planned portraiture shoots due to two things: this lens was manual focus so it didn't make shooting particularly fast which can be a problem when your subject is getting bored waiting for you to just take the photo! The second thing is image quality, this lens cost around £45 and is over 20 years old which means the quality of the glass used in the lens cannot provide enough detail for the 24mp sensor which is fine unless you want to print your images larger than A3. Finally I found the colour was not quite true to life which can be good and bad depending on what you're shooting