Using Old M42 lenses on a digital SLR
Over the years that I have been taking images using SLR cameras both film and now Digital, the items that I have always show the most interest in are the lenses I have Purchased.
These days lenses are usually purchased as a secondary item to the camera body, with all the dazzling features and technology that goes into cameras and marketing them, it is easy to forget just how important an item a lens is.
It is the lens that produces the image, the camera just records this image and if its a great lens then your image stands a good chance of being so too.
Something that becomes very clear to you, the longer your into photography is that for the most part, lens technology the parts of the lens that really create the image, has been very good for a long time. Little development is needed with the type of glass and the coatings that are used on the lenses.
Most of the development today is with adding lens features such as image stabilisation, the process of moving some of the lens elements to allow for any movement in the camera while it is being held in your hands and help produce a stable image.
So just how far back do you have to go to get a good if not great lens ?
Hoya is a lens filter and lens coating company, they have done huge amounts of research and development over an very long period of time. you may know of them mostly through their UV filters that are attached to a lot of peoples lenses.
Back in the 1970’s along with a lens manufacture Tokina they also sold a limited number of great lenses, I am lucky enough to own a Hoya 28mm f2.8 M42 lens in very good condition, it cost £50 in 1975. I have used this lens for many years for Landscape work and have always been very happy with its results.
This is a fully Manual lens , No auto focus, no stabilisation, No auto exposure and just perfect for Landscapes.
I feel that landscape photography should take a little time and the fact that everything is fully manual with this lens, just adds to this experience. You have to think through all the settings and this extends into your thoughts about what your taking images of.
I feel that this Hoya lens is one on the best I have for reproducing great colours, contrast and sharpness.
The Gallery below is just a quick sample of some very recent images taken using this lens.
Hoya M42 28mm, f2.8 lens gallery
What is Bokeh
Wiki have a great description here : Lens Bokeh
“In photography, bokeh is the aesthetic quality of the blur, in out-of-focus areas of an image. Bokeh has been defined as “the way the lens renders out-of-focus points of light”.
However, differences in lens aberrations and aperture shape cause some lens designs to blur the image in a way that is pleasing to the eye, while others produce blurring that is unpleasant or distracting.
Bokeh is often most visible around small background highlights, such as specular reflections and light sources, which is why it is often associated with such areas.
However, bokeh is not limited to highlights; blur occurs in all out-of-focus regions of the image.”
I have been looking for a way to test this feature of my lenses for a little time, then at Christmas we put up some little led lamps as below. So using two different lenses one a Nikon 50mm f1.8 lens and A Mamiya 45mm f2.8 lens I took some images of the lights, with the lens as out of focus as I could get them.
I think that the images below clearly show the effects that are described in the Wiki link, seeing clearly the effects of the number of aperture blades and their shape.
The Nikon lens as seven blade but they are not curved , the Mamiya lens blades are curved. You can clearly see that the shapes created are very different.
Lens Bokeh examples
Mamiya Sekor lens
Nikom AIS Lens