Another test of the 25mm CCTV lens.

Having fixed the focusing mechanism of the 25mm CCTV lens I was experimenting with I went for another walk with it. The first test/walk is here.

It turned out that while the focusing mechanism now works the lens now focusses well past infinity and no longer focusses as close at it had when the focusing mechanism wasn’t working properly. I haven’t decided if I’m going to dismantle the focusing mechanism again or just leave it as it is.

Old seed pods and new leaves. It seems strange for the old seed pods to be on the plant this time of year. The swirling around the edges of the frame is very obvious in this shot.

Old seed pods and new leaves.

Some interesting variegated leaves. The swirling around the edges and vignetting in the corners is less obvious in this shot.

25mm CCTV lens adapted to fit a mirrorless camera.

A walk with a 25mm CCTV lens.

An afternoon walk, this time with a 25mm f/1.4 CCTV lens adapted to fit a mirrorless camera. I quickly discovered that the lens has to be used wide open, when I stopped it down I could see it vignetting badly in the camera viewfinder. It still vignettes a little wide open and as the image circle produced by the lens barely covers the sensor there can be some interesting swirling around the edges of the frame.

Soon after discovering that the lens needs to be kept wide open the focusing mechanism started playing up. Initially the focusing appeared to be jammed, once I got the focusing collar to turn the lens would focus on close subjects but wouldn’t focus on distant subjects.

I continued on my walk as my testing was going to be mostly close subjects. When I got home from the walk I got the focusing mechanism working and think that I have managed to fix it.

Some interesting variegated Hosta leaves. One of the first shots taken with the lens before the focusing mechanism started playing up. The edges of the frame don’t show much swirling in this shot.

Interesting variegated Hosta leaves.

Ivy leaves on a tree trunk. The swirling around the edges of the photo is really noticeable in this shot.

Swirling around the edges.

Monochrome variegated leaves.

Monochrome Monday travels back a couple of weeks to one of my early walks testing lenses adapted to a mirrorless camera.

These interesting variegated leaves were taken on the second outing with a 35mm f/1.7 CCTV lens and was one of the shots that made me decide try a couple more CCTV lenses. Going by my minimal notes the lens was stopped down just a little to around f/2.

Variegated leaves in monochrome.

An afternoon walk, 18th June.

I have physiotherapy on Tuesday and Friday mornings. As the weather was nice I decided to go for a walk with the camera on Tuesday afternoon to continue exercising my leg and arm.

For the walk I used my oldest lens, an Olympus OM Zuiko 50mm f/1.8 I purchased with an Olympus OM1 in 1976. I also decided to keep the lens set at its maximum aperture, f/1.8, for all the shots.

The lens is one of the early OM system lenses know as silvernose (or silver nose depending on the reference) because they have a shiny brushed aluminium front on the filter mount. They’re often single coated rather than the multi coating used on modern lenses. My copy of the lens has had a hard life over the years, it was once submerged in Georgian Bay and dried out in an oven.

Some interesting variegated Hosta leaves.

Some variegated leaves in the spring.

A small group of Dandelion seed heads. I didn’t spot the falling seed until I posted the photo on Instagram a day later.

Dandelion seed heads.