PENTAX
110 LENSES on a Micro Four Thirds (MFT) Camera
These
lenses are for the Pentax 110 camera system
There are adapters available to use the
lenses of the Pentax 110 SLR system on a MFT camera. As these lenses
were made to cover 110 pocket
format, which is 13x17mm, and Micro Four Thirds sensors are 13x17.3,
this is a perfect match. I made a little page about Olympus Pen MFT cameras here.
Opens in a new window.
There is nevertheless a problem to use
these lenses: the Pentax camera has the aperture behind the camera
mount. The lenses have no aperture and they all open to f 2.8. So the
lenses are quite
soft.
I have tried the aperture disc system of a Lensbaby, which I adapted to
the adapter of a Sony A7 camera. A first try did not succeeed, the
results are at the
bottom of the according A7 page. I will have
another try later. I recently found an iris unit
that may fit into the tube of
the adapter. I ordered it from China. This may take some time, but I
will report back.
The MFT adapter.
Interior side.
The adapter and the main 3 Pentax lenses.
Focal length: 18mm, a wide-angle
of 36mm equiv. in MFT format.
Camera and the 18mm lens.
Sample picture: You may click
on the sample image for full resolution. The
full resolution image opens in a new window, so you can keep it open
for comparison.
F 2.8, a quick shot in my atelier. There will be more when the iris
unit has arrived.
Focal length: 24mm, the standard
length of both systems
Camera and the 24mm lens. It's incredibly small.
Sample picture: You may click
on the sample image for full resolution. The
full resolution image opens in a new window, so you can keep it open
for comparison.
F 2.8, a quick shot in my atelier. There will be more when the iris
unit has arrived.
Focal length: 50mm, a portrait
length of 100mm equiv.
A7 and the lens.
Sample picture: You may click
on the sample image for full resolution. The
full resolution image opens in a new window, so you can keep it open
for comparison.
F 2.8, a quick shot in my atelier. There will be more when the iris
unit has arrived.
Obviously there was a rare adapter with built-in iris. It's no longer
available, it was quite expensive and I have never seen one. You come
across it on MFT forums, there are mainly people searching for one or
for a way to build one.
On the adapter the mount sits deep in a kind of tube.
The original mount has the aperture just behind the mount. On the
picture you see the 2 aperture blades wide open at F2.8. They are at
~5mm from the flange. The lenses protrude a bit more than 4mm from the
flange, so the aperture sits right behind the last element of the lens.
As said above,I recently found an iris unit that may fit into the tube
of
the adapter. I ordered it from China. This may take some time, but I
will report back.
