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martyn_bannister
Joined: 23 May 2010
Posts: 1151
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 Posted: Sat Jul 16, 2011 7:25 pm Post subject: Canon 55/1.2 EOS conversion |
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martyn_bannister wrote:
Finally got around to converting this FL mount lens so that I can use it on my 5D without an optical adapter.
Conversion is totally reversible and does not change original lens at all. Proof of concept is in perspex. Need to do the same in aluminium.
Still a slight issue with infinity - needs a few more thou off the spacer.
But away from infinity, hitting the right focus is, unsurprsiingly, difficult!
Had to scavenge a miranda 135/3.5 for some screws - couldn't be bothered to make some!
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std
Joined: 09 Feb 2010
Posts: 1827
Location: Bulgaria
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| Posted: Sat Jul 16, 2011 7:29 pm Post subject: |
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std wrote:
Does it hit the mirror when you focus it past 30 meters?
I have tried mine on film EOS (which should be same as 5d) and it hits it.
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Stefan
My lens list:
SLR MD: Rokkor 1,7/50 Exakta: Kilfitt-Makro-Kilar E 3.5/4cm; CZJ 2/50 Pancolar;M42: CZJ 2.8/50 Tessar; Mir-1B 2.8/37; Jupiter-9 2/85 T-mount: Tamron 5.9/200; Tamron 6.9/300; Tamron 7.5/400 C-mount: Cosmicar 1.8/50 Y/S: Sun 3.5/38-90, Sun 4/70-210 RF Contax RF: Jupiter-8 2/50; Contax G:CZ 2,8/21 Biogon T; CZ 2,8/28 Biogon T; CZ 2/35 Planar T; CZ 2/45 Planar T; CZ 2,8/90 Sonnar T |
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martyn_bannister
Joined: 23 May 2010
Posts: 1151
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| Posted: Sat Jul 16, 2011 7:31 pm Post subject: |
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martyn_bannister wrote:
| std wrote: |
Does it hit the mirror when you focus it past 30 meters?
I have tried mine on film EOS (which should be same as 5d) and it hits it. |
I have held the lens against the M42 adapter (which had had about 0.5mm taken off it) without the spacer and it didn't hit the mirror. It must be darn close, but no, it doesn't. |
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std
Joined: 09 Feb 2010
Posts: 1827
Location: Bulgaria
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| Posted: Sat Jul 16, 2011 7:36 pm Post subject: |
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std wrote:
Should be the same as mine - it has a thin eos adapter screwed on it.
But when you focus to infinity the glass goes about 1-2 mm past the adapter.
_________________
Stefan
My lens list:
SLR MD: Rokkor 1,7/50 Exakta: Kilfitt-Makro-Kilar E 3.5/4cm; CZJ 2/50 Pancolar;M42: CZJ 2.8/50 Tessar; Mir-1B 2.8/37; Jupiter-9 2/85 T-mount: Tamron 5.9/200; Tamron 6.9/300; Tamron 7.5/400 C-mount: Cosmicar 1.8/50 Y/S: Sun 3.5/38-90, Sun 4/70-210 RF Contax RF: Jupiter-8 2/50; Contax G:CZ 2,8/21 Biogon T; CZ 2,8/28 Biogon T; CZ 2/35 Planar T; CZ 2/45 Planar T; CZ 2,8/90 Sonnar T |
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martyn_bannister
Joined: 23 May 2010
Posts: 1151
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| Posted: Sat Jul 16, 2011 7:49 pm Post subject: |
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martyn_bannister wrote:
| std wrote: |
Should be the same as mine - it has a thin eos adapter screwed on it.
But when you focus to infinity the glass goes about 1-2 mm past the adapter. |
You are right.
At the moment I'm not getting infinity, so I have to reduce the spacer a tiny bit. I'm hoping that when I get it right, the lens body will be right up againt the M42 adapter face. If it then projects far enough back to hit the mirror then so be it. As I say, at the moment it doesn't, so I might just sacrifice inifinity for the sake of using it close up 
I have been waiting ages to use this lens wihtout an optical adapter and I have also just picked up a 50/1.4 too, so I want to convert that too |
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tikkathree
Joined: 19 Jun 2010
Posts: 755
Location: Lovely Suffolk in Great Britain
Expire: 2012-12-28
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| Posted: Sat Jul 16, 2011 8:26 pm Post subject: Re: Canon 55/1.2 EOS conversion |
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tikkathree wrote:
| martyn_bannister wrote: |
Finally got around to converting this FL mount lens so that I can use it on my 5D without an optical adapter.
But away from infinity, hitting the right focus is, unsurprsiingly, difficult
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I used to think digital was fun but then I discovered film, then I found old lenses and then, eventually I found rangefinders.
EOS 5DII, loadsalenses
Canon G9 IR conv,
MF: TLR, 645 and folders
35mm: Oly OM Pro bodies 1, 2, 3 and 4; Soviet RF kit |
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martyn_bannister
Joined: 23 May 2010
Posts: 1151
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| Posted: Sun Jul 17, 2011 7:25 am Post subject: Re: Canon 55/1.2 EOS conversion |
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martyn_bannister wrote:
| tikkathree wrote: |
| martyn_bannister wrote: |
Finally got around to converting this FL mount lens so that I can use it on my 5D without an optical adapter.
But away from infinity, hitting the right focus is, unsurprsiingly, difficult |
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LucisPictor
Joined: 26 Feb 2007
Posts: 17633
Location: Oberhessen, Germany / Maidstone ('95-'96)
Expire: 2013-12-03
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| Posted: Sun Jul 17, 2011 8:06 am Post subject: Re: Canon 55/1.2 EOS conversion |
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LucisPictor wrote:
| martyn_bannister wrote: |
Of course, I could just use an AF-Confirm M42 adapter |
Wouldn't make much sense with an f/1.2 lens. Those chips or rather the AF-system is much too inexact for such a narrow DoF.
That's the reason why many EF 1.2/85L users complain about the lack of sharpness of their lens. Honestly!
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Old list: http://forum.mflenses.com/viewtopic.php?t=65 (Not up-to-date, sorry!) | http://www.lucispictor.de | http://www.alensaweek.wordpress.com |
http://www.retrocamera.de |
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AhamB
Joined: 22 Jun 2008
Posts: 733
Location: Germany
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| Posted: Sun Jul 17, 2011 8:34 am Post subject: Re: Canon 55/1.2 EOS conversion |
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AhamB wrote:
| martyn_bannister wrote: |
That's the reason why many EF 1.2/85L users complain about the lack of sharpness of their lens. Honestly! |
I haven't seen many complaints about the 85L at all. There are far more complaints about the 50L's focus shift.
Last edited by AhamB on Mon Jul 18, 2011 6:43 am; edited 1 time in total |
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martyn_bannister
Joined: 23 May 2010
Posts: 1151
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| Posted: Sun Jul 17, 2011 8:34 am Post subject: |
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martyn_bannister wrote:
Knife edge DOF wide open is one thing.......
Not sure I am so keen on the shocking CA/bokeh/glow whatever 
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trifox
Joined: 14 May 2008
Posts: 3614
Location: UK
Expire: 2014-05-29
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| Posted: Sun Jul 17, 2011 8:44 am Post subject: |
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trifox wrote:
- a few words to the CA issue
It's almost unavoidable to get pictures free of CA with this fast lens.
The good news is this; the closer your are to the exact register distance (42 mm in this case), the less CA and other aberrations you get.
Regarding AF - hmm, from my point of view, that thing simply doesn't work -- the best AF chip is LiveView - moreover, you can see perfectly CA through LiveView and correction of DOF is absolutely great.
tf
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martyn_bannister
Joined: 23 May 2010
Posts: 1151
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| Posted: Sun Jul 17, 2011 9:16 am Post subject: |
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martyn_bannister wrote:
| trifox wrote: |
- a few words to the CA issue
It's almost unavoidable to get pictures free of CA with this fast lens.
The good news is this; the closer your are to the exact register distance (42 mm in this case), the less CA and other aberrations you get.
Regarding AF - hmm, from my point of view, that thing simply doesn't work -- the best AF chip is LiveView - moreover, you can see perfectly CA through LiveView and correction of DOF is absolutely great.
tf |
But that means a 5D mk2 Nooooooohhhhhhh........... |
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trifox
Joined: 14 May 2008
Posts: 3614
Location: UK
Expire: 2014-05-29
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| Posted: Sun Jul 17, 2011 9:23 am Post subject: |
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trifox wrote:
I think you'll be happy with the lens on your 5D anyway
but the fast lenses really suffer from focus shift when adapted with inaccurate adapter or converted with inaccurate register distance.
The infinity must be spot on. Otherwise, you can not really get what you see -I mean a good picture even at closer distances.
In other words - you see perfectly focused image through your viewfinder but the reality is different ..
tf
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Excalibur
Joined: 19 Jul 2009
Posts: 5019
Location: UK
Expire: 2014-04-21
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| Posted: Sun Jul 17, 2011 9:32 am Post subject: |
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Excalibur wrote:
| trifox wrote: |
I think you'll be happy with the lens on your 5D anyway
but the fast lenses really suffer from focus shift when adapted with inaccurate adapter or converted with inaccurate register distance.
The infinity must be spot on. Otherwise, you can not really get what you see -I mean a good picture even at closer distances.
In other words - you see perfectly focused image through your viewfinder but the reality is different ..
tf |
Didn't we have a thread about this (i.e. sending an old lens to be CLA'd by an expert), and I still don't get it for well erm film cameras and thought if the mirror is in the correct postion then from the viewfinder WYSIWYG and DOF will cover most errors.
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Canon A1, AV1, T70 & T90, EOS 300 and EOS300v, Chinon CE and CP-7M. Contax 139, Fuji STX-2, Konica Autoreflex TC, FS-1, FT-1, Minolta X-700, X-300, XD-11, SRT101b, Nikon EM, FM, F4, F90X, Olympus OM2, Pentax S3, Spotmatic, Pentax ME super, Praktica TL 5B, & BC1, , Ricoh KR10super, Yashica T5D, Bronica Etrs, Mamiya RB67 pro AND drum roll:- a Sony Nex 3
.........past gear Tele Rolleiflex and Rollei SL66.
Many lenses from good to excellent. |
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martyn_bannister
Joined: 23 May 2010
Posts: 1151
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| Posted: Sun Jul 17, 2011 9:56 am Post subject: |
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martyn_bannister wrote:
| trifox wrote: |
I think you'll be happy with the lens on your 5D anyway
but the fast lenses really suffer from focus shift when adapted with inaccurate adapter or converted with inaccurate register distance.
The infinity must be spot on. Otherwise, you can not really get what you see -I mean a good picture even at closer distances.
In other words - you see perfectly focused image through your viewfinder but the reality is different ..
tf |
I hope so. As std pointed out above, I'm not convinced I am going to be able to hit the 42mm register distance (i.e. get the conversion to focus infinity) without fouling the 5D mirror. I am however hoping to get it close enough so that I can get accurate ViewFinder focusing, even if I can't quite get infinity. At the moment, the perspex spacer flexes too much, so I must wait for some aluminium sheet to arrive. |
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trifox
Joined: 14 May 2008
Posts: 3614
Location: UK
Expire: 2014-05-29
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| Posted: Sun Jul 17, 2011 5:09 pm Post subject: |
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trifox wrote:
Martyn, I am not sure but I believe that you mirror will miss the rear glass just a tiny bit after getting 42mm
tf
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martyn_bannister
Joined: 23 May 2010
Posts: 1151
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| Posted: Sun Jul 17, 2011 6:54 pm Post subject: |
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martyn_bannister wrote:
| trifox wrote: |
Martyn, I am not sure but I believe that you mirror will miss the rear glass just a tiny bit after getting 42mm
tf |
Thx for that info, let's hope so. You are the man who knows. I appreciate it. |
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