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PB->EOS adapter (PB-EF adapter)
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PostPosted: Wed Nov 19, 2008 3:15 pm    Post subject: PB->EOS adapter (PB-EF adapter) Reply with quote

You may have seen this adapter at *Bay, here is some more info.

As I said before somewhere else, this adpater does not give you infinity focus for
certain Prakticars, so I shaved the base metal using Dremel (tm). Very Happy
The main reason I shaved is to ease mounting genuine CZJ made Prakticars,
they are very hard to mount to this adaptor due to base metal is too thick for
CZJ made Prakticars, whose mechanical standard is much more precise.

Left original, Right metal is shaved for infinity focus and some Prakticars (easier to mount)


Make a canal(?)/dent for 350D's mount base metal for lens stoper mechanism so that you do not have to dismount adapter!!


Final looks like this


With Prakticar 50/1.4 (first type, lens name on the lens barrel)


Ex.1 All are shot at f1.4, close range


Ex.2 This lens is softer than the second model of 50/1.4 at f1.4, but bokeh is much wilder!


Ex.3 @33cm


Ex.4 Focus at the tip of nose


Last edited by koji on Fri Dec 05, 2008 6:12 pm; edited 1 time in total


PostPosted: Wed Nov 19, 2008 3:27 pm    Post subject: Reply with quote

Shocked I would only recommend making this "canal" in your cam mount if you only want to use this cam for PB lenses.
Otherwise there can be the danger of light leaks.


PostPosted: Wed Nov 19, 2008 4:15 pm    Post subject: Reply with quote

OUCH, not only could be bad for light leaks but also a good way for dust to get in! Shocked


PostPosted: Wed Nov 19, 2008 5:39 pm    Post subject: Reply with quote

Great idea to provide new life for this superb lenses! Thanks for sharing!


PostPosted: Wed Nov 19, 2008 6:48 pm    Post subject: Reply with quote

People wary too much I think. Light leak, I thought from the beginning,
is pretty weak, and bayonet mount and its "nail" almost stops it. The dust
is not to wary neither, if you are using a zoom lens the camera breaths
much easier. Very Happy Just kidding.

I did put a piece of sticker backing(ie. self-adhesive) foam into the canal.
You can see the result from my new photo below. I have many of those camera
repair goods. Cool

(Maybe I should become a camera repair man! Laughing)



Any more problem?

(Yes, yes, I could not sell this cam easily, but I have no intention to do so.)


Last edited by koji on Fri Dec 05, 2008 2:12 pm; edited 2 times in total


PostPosted: Wed Nov 19, 2008 7:03 pm    Post subject: Reply with quote

Laughing


PostPosted: Sun Nov 30, 2008 4:40 pm    Post subject: Reply with quote

Koji,

I'm surprised you went this route, given the envy with which I've eyed your PB-converted EOS.

Any interest in selling that modified bayonet?

-Zandr


PostPosted: Fri Dec 05, 2008 7:16 am    Post subject: Reply with quote

It looks like this will be my next project after Rollei adapter Smile


PostPosted: Fri Dec 05, 2008 2:19 pm    Post subject: Reply with quote

n6mod, there is no chance right now to get this modified adaptor! Very Happy

Yalın, I might love much more "tinkering" than photography. Very Happy


PostPosted: Fri Dec 05, 2008 4:47 pm    Post subject: Reply with quote

koji wrote:
n6mod, there is no chance right now to get this modified adaptor! Very Happy


Actually, I was wondering if you were interested in parting with your previous approach, the PB-EF mount shown [url]here[/url].

I'm actually quite happy with my SR-mount 20D, so doing that again for PB is appealing. Smile I'll keep looking for a donor B-series camera in the mean time.

Since you lucked out on all the thicknesses there, can you tell me which camera donated the mount? If I have to start shaving the mount and keep it flat, we've probably exceeded my tools and (more importantly) abilities. Smile

-Zandr


PostPosted: Fri Dec 05, 2008 5:08 pm    Post subject: Reply with quote

Hi, all the PRAKTICA (i mean PB-mount) camera have the identical mount
base metal, as far as I observed so far. Mine came from a broken BX-20,
also one more from B200 I bought many years ago, this nice camera died
after many useful days.

Anyway, any one is alright to me. This base metal has 2mm (exact) thick,
which is exactly the depth of bayonet nail from the mount surface of EF-
mount metal. So as you know PB-mount is sitting on the three nails of
EF-mount roughly speaking. Conveniently it makes the combined mount
has 44.4mm flange distance, which is the exactly Praktica bayonet flange
distance. That's was a sire luck.

I still have the old "Praktica mount" for EOS_350D, however the most of
Prakticars will cause a trouble for FF EOS cameras including film EOSs.
There is one more problem of the combined mount, it cannot have lens
mount stopper to secure the lens from dropping from the mount. This is
the most annoying part for me, so I was looking for a new PB->EF adaptor.

Luckily there is one available these days, it looks like old PB->FD adaptor,
I guess that the creator of this new adaptor leant very well about that old one.


PostPosted: Fri Dec 05, 2008 6:16 pm    Post subject: Reply with quote

koji wrote:
Hi, all the PRAKTICA (i mean PB-mount) camera have the identical mount
base metal, as far as I observed so far.


Great, thanks. I'll keep watching for a dead camera, then.

Quote:
There is one more problem of the combined mount, it cannot have lens
mount stopper to secure the lens from dropping from the mount. This is
the most annoying part for me, so I was looking for a new PB->EF adaptor.


I know you had the same complaint with the Italian guy's Minolta mount, but it hasn't bothered me on mine.

Quote:

Luckily there is one available these days, it looks like old PB->FD adaptor,
I guess that the creator of this new adaptor leant very well about that old one.


Got a link? The only one I can find is the one you had to dremel out at the top of this thread. I have the same infinity focus issues with the CZJ 50/1.4 (first version).

Thanks again!

-Zandr


PostPosted: Fri Dec 05, 2008 7:07 pm    Post subject: Reply with quote

Look for ePay name "ciecio7", who is still selling this new adaptor.
Normal starting price is GBP 20.

The other PB->FD adaptor also was found on ePay, but it is
very rare item nowadays. I do not remember the name of
the seller of this oldish adaptor.

My concern for "lens stopper" is that I normally carry camera+lens
from my neck, I seldom use a camera bag unless going to a trip.
I do not wish to destroy some of Prakticars, which are very rare, Very Happy
and was extremely, as CZJ'a lens goes, expensive. Shocked

I am responsive to keep those Prakticars as much as their original
shape as a Prakticar collector. Serious.


PostPosted: Fri Dec 05, 2008 7:14 pm    Post subject: Reply with quote

koji wrote:
Look for ePay name "ciecio7", who is still selling this new adaptor.
Normal starting price is GBP 20.


Interesting, this looks much like the adapter I have (got from eBay seller funkykoval2001 with the 50/1.4 CZJ), and he says "infinity focusing not guaranteed". Were you able to get infinity focus with your 50/1.4, or is this the adapter you modified?

koji wrote:
My concern for "lens stopper" is that I normally carry camera+lens
from my neck, I seldom use a camera bag unless going to a trip.


Ah, that the difference. I generally dislike neck/shoulder straps, and tend to use a Slingshot, so the camera is secure in a bag or in my hands. Very Happy


PostPosted: Fri Dec 05, 2008 7:35 pm    Post subject: Reply with quote

"ciecio7" says "infinity focus is guaranteed", I was skeptical but bid it.

Some Prakticars can achieve an infinity focus, but the rest (although have
not tested all) did not achieve as it is. As I mentioned in the original post,
it is hard to mount genuine CZJ made Prakticars, so I shaved and got
infinity focus too for example the both 50/1.4s.

The base metal is about 0.14~0.20 mm too thick to achieve infinity focus
on EOS camera. My shaved adaptor is still a tad too thick, but some
lenses become too loose, such as 80/1.8 and Penatcon made 135/2.8.

After shaving my EOS-5D's mirror, I will finally show how good those
Prakticars are in "MFlenses". Very Happy

(I hate shaving everyday, but don't mind it on camera or adaptors. Very Happy)


Last edited by koji on Sat Dec 27, 2008 9:47 pm; edited 1 time in total


PostPosted: Sat Dec 20, 2008 12:45 pm    Post subject: Reply with quote

thanks for sharing your projects.


PostPosted: Sat Dec 20, 2008 2:53 pm    Post subject: Reply with quote

I have a watch that doesn't tell time anymore, do you think you could fix it for me? LOL.


PostPosted: Sat Jan 10, 2009 4:52 am    Post subject: Reply with quote

@ Koji

Any more feedback on the PB to EOS adapters?


PostPosted: Sat Jan 10, 2009 5:15 pm    Post subject: Reply with quote

@HK300

Sorry, I have no more things to say about PB->EF adapter.
When I have more to say, will come back in here. Very Happy


PostPosted: Mon May 21, 2012 11:13 am    Post subject: Reply with quote

Hi guys, I was kind of sad due to the lack of easily achievable infinity focus with PB mount lenses on canon EOS.
I have one mechanical adapter but it cant achieve infinity focus. I have done one video exercise where I used my Prakticar 2.8 / 135 and Canon 1.8 / 50.


Some time a ago I found blog of this guy but I am bit confused about this upgrade.


Can anyone look at this and maybe bring more light to this update and if it is possible to get infinity focus after doing so. Thanks.

Martin.


PostPosted: Mon May 21, 2012 5:13 pm    Post subject: Reply with quote

mxpx22 wrote:
Hi guys, I was kind of sad due to the lack of easily achievable infinity focus with PB mount lenses on canon EOS.
I have one mechanical adapter but it cant achieve infinity focus. I have done one video exercise where I used my Prakticar 2.8 / 135 and Canon 1.8 / 50.
http://youtu.be/cW9D3bEHaS0?hd=1

Some time a ago I found blog of this guy but I am bit confused about this upgrade.
http://my.opera.com/iuve/blog/how-to-modify-a-prakcicar-bayonet-pb-mount-lens-to-use-with-canon-eos-camera

Can anyone look at this and maybe bring more light to this update and if it is possible to get infinity focus after doing so. Thanks.

Martin.


Welcome Martin!

To make PB adapter to EOS not easy if looks okay with maker lens, that is very possible will not works with other lenses, due need to make it very thin.

Solution is either use more compatible camera like all mirror less or match adapter with actual lens if possible by an expert.


PostPosted: Sat Dec 08, 2012 12:07 pm    Post subject: Reply with quote

I got this adapter for PB-EOS on ebay from ynaan - waiting for it.

http://www.ebay.co.uk/itm/400335355365?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

Has anybody tried it? I have a CZJ 28/2.8 and hoping I can get infinity focus on my EOS.

Or otherwise, what has worked for anyone else with PB-EOS? I realise we need to get creative here!


PostPosted: Wed Jan 07, 2015 6:53 pm    Post subject: Reply with quote

http://pages.ebay.com/link/?nav=item.view&alt=web&id=121096572685

This one sounds good?