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koji
Joined: 21 Jul 2008
Posts: 2107
Location: Hiroshima, Japan
Expire: 2012-12-27
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 Posted: Sat Jul 26, 2008 2:26 pm Post subject: PB-EF mount for Practicar users if you are a handy man |
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koji wrote:
DIY PB(Praktica Bayonet)-mount on EOS Rebel XT (aka 350D in Europe, Kiss DN in Japan) for people to
contemplating changing Prakticars to something else for newer digital SLR. This mount is not so convenient
like the other XX->EOS mount adapters, but it works perfectly without losing the infinity focus.
I filed off the perimeter of one PB-mount to fit the EF-mount tightly, and heated EF-mount very hot then
hammered the filed PB-mount in just like they do for mounting tire for locomotives. So I do not need to
glue it but used "Krazy Glue" it to EF-mount metal later just in a case.
PB-mount's flange distance is 44.4mm, luckily the depth of EF-mount to its bayonet is exactly 2mm, which
is the same as PB-mount's base metal thickness. So the filed PB-mount is basically sitting on the inside of
EF-mount at the three places. The small ridge on the PB-mount has 0.4mm high, so the final flange distance is
44.4mm.  Anyway see (same as in my HP)
Caution: You can implant this PB-EF mount to FF EOS SLR, but the majority of Prakticars will hit the mirror.
Actually the mirror hits the rear of the lens technically speaking when you focus close to infinity range.
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Last edited by koji on Tue Dec 27, 2011 11:12 pm; edited 5 times in total |
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Sat Jul 26, 2008 2:38 pm Post subject: |
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Attila wrote:
Many thanks for sharing this important information! I hope with this trick we can save many prakticar lenses for future.
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kansalliskala
Joined: 19 Jul 2007
Posts: 5040
Location: Southern Finland countryside
Expire: 2016-12-30
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| Posted: Fri Aug 29, 2008 10:04 am Post subject: Re: PB-EF mount for Practicar users if you are handy man |
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kansalliskala wrote:
| koji wrote: |
| heated EF-mount very hot then hammered the filed PB-mount in just like they do for mounting tire for locomotives. |
you took the EF-mount off the camera first? right?
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AF: Canon, Tokina, Sigma Video: JVC GZ-MG275E |
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Farside
Joined: 01 Sep 2007
Posts: 6557
Location: Ireland
Expire: 2013-12-27
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| Posted: Fri Aug 29, 2008 4:53 pm Post subject: |
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Farside wrote:
Excellent! A Prakanon 
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Fri Aug 29, 2008 5:15 pm Post subject: |
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Attila wrote:
YES! Koji made a new category in history 
_________________
-------------------------------
Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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maddog10
Joined: 08 Apr 2008
Posts: 1072
Location: Maryland, USA
Expire: 2015-02-12
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| Posted: Fri Aug 29, 2008 5:37 pm Post subject: |
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maddog10 wrote:
| Farside wrote: |
| Excellent! A Prakanon |
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yalcinaydin
Joined: 20 May 2008
Posts: 825
Location: Izmir, Turkey
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| Posted: Wed Dec 10, 2008 10:33 am Post subject: |
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yalcinaydin wrote:
Oooo, I've missed this one, really cool!
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hk300
Joined: 30 Oct 2008
Posts: 1041
Location: Hong Kong
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| Posted: Fri Dec 19, 2008 3:03 pm Post subject: |
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hk300 wrote:
missed this post ... but ... wouldn't it be easier to just use an adaptor? |
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n6mod
Joined: 20 Oct 2008
Posts: 134
Location: Boulder Creek, CA, USA
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| Posted: Fri Dec 19, 2008 4:44 pm Post subject: |
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n6mod wrote:
| hk300 wrote: |
| missed this post ... but ... wouldn't it be easier to just use an adaptor? |
Koji ended up going that route, but his post about it http://forum.mflenses.com/pb-eos-adapter-pb-ef-adapter-t12569.html makes me think that the modified body is easier.
He had to shave the adapter some to get infinity focus, and you can't change lenses with the adapter on the body unless you mill out a channel on the mount. If you can get adapters made that don't have those issues, I think they'd be a hit around here.
Plus, I really like my Minolta mount 20D.
Koji doesn't like the replacement mount solutions because they don't offer a lock on the lens. This doesn't matter to me, since I usually carry my cameras in a slingshot (bag), rather than on a strap. |
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yalcinaydin
Joined: 20 May 2008
Posts: 825
Location: Izmir, Turkey
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| Posted: Fri Dec 19, 2008 7:12 pm Post subject: |
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yalcinaydin wrote:
| n6mod wrote: |
He had to shave the adapter some to get infinity focus, and you can't change lenses with the adapter on the body unless you mill out a channel on the mount. If you can get adapters made that don't have those issues, I think they'd be a hit around here.
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I'm planning that but I'm really slow due to depending on just one mechanical engineer, so anybody achieves this is welcomed
_________________
My name is "Yalcin", and exactly "Yalçın" and here you can find my MF samples:
http://www.flickr.com/photos/yalcinaydin/sets/
Right now switching back to AF because of work needs but I still love the MF lenses |
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Farside
Joined: 01 Sep 2007
Posts: 6557
Location: Ireland
Expire: 2013-12-27
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| Posted: Sat Dec 20, 2008 1:29 am Post subject: |
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Farside wrote:
| hk300 wrote: |
| missed this post ... but ... wouldn't it be easier to just use an adaptor? |
With an adapter, you don't get to use a hammer 
_________________
Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
BUY FRESH FOMAPAN TO HELP KEEP THE FACTORY ALIVE ---
Foma Campaign topic -
http://forum.mflenses.com/foma-campaign-t55443.html
FOMAPAN on forum -
http://www.mflenses.com/fs.php?sw=Fomapan
Webshop Norway
http://www.fomafoto.com/
Webshop Czech
https://fomaobchod.cz/inshop/scripts/shop.aspx?action=DoChangeLanguage&LangID=4 |
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n6mod
Joined: 20 Oct 2008
Posts: 134
Location: Boulder Creek, CA, USA
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| Posted: Sat Dec 20, 2008 3:55 am Post subject: |
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n6mod wrote:
| Farside wrote: |
| With an adapter, you don't get to use a hammer |
Depends on the adapter. |
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hk300
Joined: 30 Oct 2008
Posts: 1041
Location: Hong Kong
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| Posted: Sat Dec 20, 2008 12:46 pm Post subject: |
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hk300 wrote:
| n6mod wrote: |
| Farside wrote: |
| With an adapter, you don't get to use a hammer |
Depends on the adapter. |
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