Pentacon AV 80mm f2.8 on Canon EF

[jhayashileite]

Hello everyone

I am about to receive some recent purchases from eBay. They include a Pentacon AV lens, M42 extension tubes and helicoid. I am hoping I can adapt this lens to my Canon DSLR and use it in its full range from close focus to infinity.
Since most of the photos I see using this lens are macro and/or taken with mirrorless cameras, I would like to hear from people that use this lens or other projector lenses on DSLRs and how they adapt it. I would also like to know what is the flange distance of this lens.

I bought those things listed above to adapt the lens and later saw this link:
https://www.instructables.com/id/How-to-Mount-Pentacon-AV-8028-on-Canon-DSLR/
Has anyone tried this? Is it safe to cut off a part of this lens? I have recently bought a Helios 44-2, but I woudn't like to take it apart just to adapt another lens, and have an unusable optic block.

Any help will surely be appreciated.

Josué

[ZoneV]

Sometimes you can find projection lenses with their outer focussing tubes. Those are often easy to adapt.
My Pentacon AV 80mm f/2.8 I glued with hot-glue to a EF-mount bajonett or adapter. And it is ready to go.
My Pentacon AV / Meyer Diaplan with outer focussing tube I taped to cheap manual extension rings for Canon EF, see here at the page bottom:
http://www.4photos.de/test/Meyer-Goerlitz-Trioplan-100mm-2.8.html

Her an old way how I adapted a projection lens to Canon EF:
http://www.4photos.de/camera-diy/Som-Berthiot-75mm-1.8-conversion.html

Today I use those helicoids from those macro converters as well, but often in a kind of modular system.

[spleenone]

That Som Berthiot lens produce nice samples.

[jhayashileite]

[olmajti]

Hi there.

If you want to have infinity on your Pentacon AV then there are few solutions to that. Holding it against your M42 to EOS adapter you will get a focus distance of about 2.5 metres. So theres no way you can get the infinity without modding your lenses. If you want to do that just grind the tubus of your lens so it will get to the desired infinity. You might have to grind the outer focusing tubus aswell but that's optional. then glue outer tubus onto your M42 adapter and youre done. The second way how to approach your issue is to get yourself a T2 to EOS adapter which is hold in place with 3-4 screws like one of these:
https://www.bresser.de/out/pictures/master/product/1/80586ac82ee0da797bfb45ee3dbc60eb_4921350_m_1.jpg
Unscrew the inside and throw it away. your outer focusing tube should fit perfectly inside. If not apply grinding or get longer screws from your local hardware store. They are M3 screws. If that's the option get yourself a rubber oring to seal your mout from any additional light. Align the outer mount with the adapter on a flat surfance so it wont go beyond Eos mount inside of your body or it will hit the mirror. That should give you an infinity. Seal the space between adapter and outer focusing ring with forementioned oring and you are done. This mod will work for nearly all slide projection lenses with some exceptions.

Enjoy!

[jhayashileite]

[jhayashileite]

Just a quick update about my lens:

I was able to make it focus very close to infinity by sawing off about 2,5cm off the back plastic cover of the lens. Had to be careful because it was deep enough for the saw to touch the body of the lens, close to the back element.

With this done, I glued a M42 screw that I had from a broken lens to the back of the lens and coupled it to my 17-31mm helicoid, M42-M42.
Now I have a fully functional lens with a wide working range.

Hope this helps whoever buys this lens and tries to do the same. Thanks to everyone that gave me tips to get to this.

Josué

[Raxar]

[jhayashileite]

Nice photos you got here.

I have already finished my mods on the lens and it has been working fine so far, as I described in my last post. Still have to test it as a macro and portrait lens.