Sony-Pentax67-FrankenMonster - IT LIIIIVES!

Hi everyone, so its been a while since my last project, but this time it is a little different that the previous ones in that it is more of a "technical experiment" to humor my curiosity and to get some inspiration through different crops, through filmgrain looks and black and white styles that I normally don’t use.

“Sony-P67-FrankenMonster” explain yourself man!

Well its a beast made from adapting the following:
Sony A7rII <—> E mount to EF mount <—> EF mount to Pentax67 MF mount <—> Pentax67 lens (!) 

 P67 &lt;--&gt; Canon EF &lt;--&gt; Sony E-mount

P67 <--> Canon EF <--> Sony E-mount

It is common sight these days to see people adapting old manual lenses to the Sony alpha series mirrorless cameras as they are easy to adapt, the converters readily available, and manual lenses forces you to slow down and take your time with composition and many find this quite delightful. And with focus peaking on the sony cameras this is really a breeze to nail focus these days.
The old manual lenses are also abundant on ebay and yahoo auctions, not to mention the many secondhand stores in Tokyo. (Bellamy from JpapanCameraHunter have detailed articles on this, I highly suggest you check out his site if you come to Tokyo to look around. )

 Canon 55mm f1.2 FD lens and easily adapts to the e mount

Canon 55mm f1.2 FD lens and easily adapts to the e mount

Disclaimer and inevitable explanation of why I would ever do such a thing?!

- Massive!
Yes the Pentax67 MF lenses are massive and too heavy to be practical with a small mirrorless system. But I am doing this for the fun and curiosity of it, and it is only meant as an experiment. You will need to decide what is right for you and your requirements.

- But wait!
Surprisingly the Pentax645 have some not too crazy-big lenses that might be an option. (tune in as this series continues and I will try and find the answer to that later)

- Corner sharpnes and all that jazz
Okay!, so why am I messing around with these huge lenses?
Well, since mos lenses are the sharpest in the center, and the Medium format lenses are renowned for being really sharp, I figured that if I adapt them to the smaller 35mm sensor on the Sony A7RII it will essentially be using the sharp center of the lens and with the high resolution of the sensor there is potential for some really sharp and interesting images coming from this combination that are not seen very often.

Note: There  are many more sensor sizes, and once we mix film sizes in it becomes more complex, but for the purpose of explaining the centerportion of the P67 lens as used for the 35mm sensor it should suffice. 

- No Wideangle?! What gives?
Well, its all relative, and getting a wideangle lens for MF is quite a bit more expensive than the standard focal lengths even used. For reference, 35mm focal length for Pentax67 format is a fisheye lens. But once adapted to my Sony 35mm sensor have the field of view of approx. 70mm full frame equivalent, and so its hard to adapt MF lenses and still have a wide option.
- Technical explanations for the whole “sensor crop vs aperture change”- discussion. Sorry I am not smart enough to explain this in enough technical detail to satisfy the people flaming about it on the interwebs, so please get that explanation from more enlightened people or Wikipedia.  

What’s next?

In this series, I will test the optical qualities of the lenses and see if they render a pleasing or interesting image. The setups will be fairly unscientific, but should help give you an idea if this is for you or not.

I will also be trying out a couple of different adaptors to see if there are noticeable differences. 
Spoiler alert! current adaptor gives me a lot of vingetting, so hopefull there is a difference once I get the other adaptor I have on order. ~ stay tuned (=゚ω゚)ノ

Pentax67 55mm f4 -- Pentax67 105mm f2.4 -- Pentax645 75mm f2.8

The Pentax67 165mm f2.8 is currently in the mail and will be part of this series in due time.