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.

Cosmic Photo Challenge: Independent Lenses in Various States.

This is my contribution to the Cosmic Photo Challenge: A State of Independence.

My first thought was a selection of juvenile birds that were independent of the adults when the photos were taken. That idea was quickly followed by the fact that this is the Canada Day long weekend so I considered a Canada Day post.

Then I thought about an ongoing project, testing a variety of lenses on a modern mirrorless camera. Most of the lenses I have tested so far are (or were) made by independent lens makers. Companies that make lenses to fit other makers cameras.

Some of the lenses are in a bit of a state through heavy use or being designed to be almost disposable. Which is why I titled the post “Independent Lenses in Various States” as a rewording of the challenge.

To the lenses.

A Periwinkle flower photographed with a 35mm f/1.7 CCTV lens adapted to fit an Olympus mirrorless camera. Shot with the lens wide open at f/1.7.

This was the first CCTV lens I purchased and I found it interesting enough to purchase a couple more. They’re also known as C-mount lenses having a screw mount for attaching to CCTV cameras with the appropriate mount.

Some of these CCTV lens are very cheap. I wonder if they’re designed to be almost disposable, used where or when a lens could get damaged somehow. The lens was $38 CAD including shipping, the adapter to fit it to the camera and two extension tubes to go between the lens and the camera to allow it to focus on closer subjects.

A Single Blue Flower.

Ivy growing up a tree trunk with a 25mm f/1.4 CCTV lens. This is one of the lenses I ordered after experimenting with the 35mm CCTV lens used for the Periwinkle flower above.

Stopping the lens down from maximum aperture causes severe vignetting so this was shot with the lens wide open at f/1.4. Wide open the lens still vignettes a bit and as the image circle produced by the lens barely covers the sensor there’s some interesting swirling around the edges of the photo.

I have already had to repair the focusing mechanism on the lens after it first jammed and then stopped focussing on distant subjects. That probably explains why the lens cost $36 CAD including shipping and the adapter to fit it to the camera.

Swirling around the edges.

Last years seed pods and new leaves with a 50mm f/1.4 CCTV lens. Shot wide open at f/1.4. This was the other CCTV lens I ordered after experimenting with the 35mm CCTV lens.

Surprisingly good performance for $41 CAD including shipping and the adapter to fit it to the camera. So I’m finding it a bit disappointing so far.

Fresh growth and seed pods.

A Bracken frond taken with a Vivitar 35mm f/1.9 lens I purchased used in the 1970s. Shot wide open at f/1.9. At the time Vivitar were a U.S. brand who designed lenses that were then manufactured by various Japanese lens makers.

The same design was built with a variety of camera mounts allowing the lens to fit a wide range of camera bodies.

I have given this lens a hard life over the years and it now feels like it could fall apart each time I use it.

Bracken frond with an adapted lens from the 1970s.

Dandelion clocks (seed heads) with a “silvernose” Olympus OM Zuiko 50mm f/1.8 lens I purchased in 1976. As with the other shots this was taken with the lens wide open, in this case f/1.8.

I don’t know if it can be classed as an independent lens. It wasn’t designed for the camera being used and requires an adapter but both the lens and camera were made by Olympus.

The silvernose refers to a polished aluminium ring on the front of the lens and signifies that it is one of the early Olympus OM Zuiko lenses. This is another lens that has had a hard life. It has been dropped a few times and was once bounced along the gutter of Charing Cross Road while attached to my Olympus OM1 when it slipped from my shoulder as I ran for the last tube train of the night. A few years later it was being dried out in an oven after being submerged in Georgian Bay.

Dandelion seed heads.

Cee’s Black and White Photo Challenge: Lines and Angles.

This is my contribution to Cee’s Black and White Photo Challenge: Lines and Angles.

Continuing my testing of various lenses adapted to a mirrorless camera I went for a walk with a 25mm f/1.4 CCTV lens attached to the camera last Thursday and spotted this tree bark with all sorts of lines and angles.

The lens only just covers the camera sensor at maximum aperture. Stopping the lens down causes it to vignette badly so I kept it at maximum aperture for the walk. Because the lens only just covers the sensor the edges of the photo are swirled and blurred with some vignetting in the corners.

Lines and Angles in Tree Bark.

Some different tree bark photographed on a walk last winter using a normal camera lens.

Monochrome tree bark.