Pentax Screw Mount (M42) to Canon EOS Lens Mount Adapters

Haoda M-42 to Canon EOS electronic mount adapter with autofocus confirmation.

With a large number of high-quality lenses in my possession, I decided I was going to have to get a digital SLR and find a way to attach my lenses.  I had already decided I would buy a Canon because there is a wide variety of successful lens mount adapters that make it possible to attach my Pentax M42 screw-mount and some K-mount lenses to a Canon digital SLR and achieve infinity focus.  The first camera they made that appeared to be an option was prohibitively expensive (~$8000) so I kept waiting.  The next one they came out with was more affordable but would be a budget crusher (~$2500), so I continued to wait.

I should interject here the main criteria for me was that the digital camera have a 24mm x 36mm sensor.  The reason for this is because my lenses are made to cover a 24mm x 36mm image frame.  A different sized sensor would result in changing the effective focal length of the lenses.  From a practical standpoint that means that my ultra-wide angle lenses would not yield ultra-wide angle shots.  My normal lenses would produce short-telephoto shots, and my long telephotos would become extreme telephotos.  That was not an option for me.

I was hoping Pentax would eventually get on the full frame sensor band wagon and produce a camera more in my price range.  As of this writing they have not done so and do not appear to have plans in that direction.

Finally I grew tired of waiting.  But all this waiting did have it's merit.  The lens adapter mount "industry", if it could be called that, had made some advancements.  When I first started looking, the adapters simply bridged the gap between the screw mount lenses I have and the bayonet mount of the camera.  They adapters were nothing more than flanges.  And worse, many were imprecise resulting in cases where infinity focus was not available.

Infinity focus is important because one needs to be able to take pictures of subjects in the distance as well as close-up.  If the adapter does not give infinity focus, the photography using it will be limited to close-working distances.  This is not a full solution and impractical for my needs.

I re-engaged my lens mount adapter search and found that the new products had brought a new feature to the game - chips mounted to "fool" the digital camera into "thinking" that there is a compatible lens mounted, enabling assisted focus.  What this means is that while the camera cannot auto-focus legacy lenses like mine, with these adapters, it can give a signal when the image is correctly focused.  For me this is a huge benefit, as I am very particular about having my images in good sharp focus.

It took me a considerable amount of time to determine, to the best of my ability, which products of this type were going to work.  The web sites and discussion groups had information that in many cases was out of date, not well researched, and in many cases, unreliable or inaccurate.  Sifting through this to make a purchase decision was tough, especially because the products are fairly expensive (~$100 for a single adapter).  I decided I would roll the dice on the product that in my research had come out the best.

I purchased and in two days received the Haoda M-42 to Canon EOS electronic mount adapter with autofocus confirmation.

 Haoda M-42 to Canon EOS electronic mount adapter with autofocus confirmation.Haoda M-42 to Canon EOS electronic mount adapter with autofocus confirmation.

Haoda M-42 to Canon EOS electronic mount adapter with autofocus confirmation.

I am happy to report that the product works perfectly on almost every last Super-Multi-Coated Takumar lens (and the matching Super-Takumar that came before) ever made.  There are five lenses (Super-Multi-Coated Takumar 1:3.5/24mm, Super-Takumar 1:3.5/28mm (early version with 58mm filter), Super-Takumar 1:2.0/35mm (early version with 67mm filter), Super-Multi-Coated Takumar 1:1.4/50mm and Auto-Takumar 35mm 1:2.3 ) that do interfere with the Canon 5D Mk II mirror.  But since the kit lens covers the same focal lengths and I have other 28mm and 35mm lenses that do work, I do not consider it a problem.  If you put the lens on its closest focus and go to LIVE VIEW you can use these lenses (that's how I captured the images).

I have mounted and get assisted focus with the following lenses:

*It should be noted that the two K-mount lenses I have use a different mount that does not provide assisted focus.  Additionally, most K-mount lenses (without irreversible modifications) will not work with the Canon 5D Mark II because the aperture control protrudes deeply and would interfere with the camera mirror.  I got lucky with the two special K-Mount lenses I own because both are manual lenses and do not have the aperture control device.

The links above take you to each lens and have images that were shot with the lens - in many cases, mounted on the Canon 5D Mark II!

I have also found a cheaper and possibly better M42 to EOS adapter that features a programmable chip - making it possible to record the lens info on the chip, and in the EXIF data of the images made.  Check the EMF Adapter Page.


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27-Aug-2012 02:25 PM

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