Rokkor 45mm f2

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Archive 2009 · Rokkor 45mm f2

Chris Radley
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p.1 #1 · Rokkor 45mm f2

Hi, is this lens any good based on people's experiences?

I've just started building a collection of alternative lenses and today bought a 58mm f1.2 MC Rokkor which is beautiful. Is the 45mm f2 Rokkor similar in IQ?

Thanks

Jan 05, 2009 at 08:34 PM

rsrsrs
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p.1 #2 · Rokkor 45mm f2

hi,
if you have a rollei EOS adapter, you can clamp it on the minolta mount
an test it until 3-4m without building anything.
My first view with it on my 5D was very promising.
but converting it will not be easy.
later this month i hopefully know more.

mit freundlichen gruessen

r schneider

Jan 05, 2009 at 09:53 PM

Chris Radley
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p.1 #3 · Rokkor 45mm f2

Thanks.

I was thinking I might be able to follow Cogitech's conversion process. Really just wondering what the IQ of the lens is like.

Jan 05, 2009 at 11:06 PM

Ed Sawyer
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p.1 #4 · Rokkor 45mm f2

IQ is ok but nothing super special. Certainly not rokkor 58/1.2 quality or even 50 1.4 quality IMO.

I have a test of it posted I think at www.edsawyer.com/lenstests/

if it's not there, I have it but haven't posted it yet.

-Ed

Jan 06, 2009 at 12:44 AM

badastronaut
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p.1 #5 · Rokkor 45mm f2

i have the 45mm f2, two actually since it was so cheap might as well buy a spare.

IQ is pretty good, very pancake like compact and lightweight which helps for discrete shooting. Definitely no where near 58mm f1.2.

It was sold as a kit lens i believe.

Jan 06, 2009 at 02:24 AM

weezintrumpete
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p.1 #6 · Rokkor 45mm f2

Sorry to bump an old thread, but is there any information on converting one of these to EOS? I recently acquired one for $20 and thought it'd be nice to use as a pancake on a 5D. I've heard rumors of something related to the Cogitech forum (which is down) and I can't find any information on how to do the conversion.

Thanks!

Apr 07, 2009 at 02:55 AM

trumpet_guy
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p.1 #7 · Rokkor 45mm f2

It's small but not greatly smaller than a Contax CZ 50/1.7 and so I've never
thought much about converting mine to EOS mount.

I don't recall ever seeing instructions here on how to do that conversion,
but best wishes. Maybe you'll find the site.

Apr 07, 2009 at 04:35 AM

CVickery
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p.1 #8 · Rokkor 45mm f2

JimBuchanan described his approach once for me. It isn't easy and the lens probably doesn't have the IQ to make it worthwhile. The 45/2 I bought for $15Cdn is still a Minolta mount. If I happen across a MD>4/3 adapter some day that's cheap enough I may try it out on my friend's Oly.

Apr 07, 2009 at 04:41 AM

debuggerus
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p.1 #9 · Rokkor 45mm f2

Well, I really like my converted one .. I think it's a sleeper, especially so cheap. I think it is easier than the 50 1.4. Used a circular grinder, sanded down .5 mm. It's easy to sand since the MD mount is removable from the bottom base. I think you should try to convert it. Good luck.

A sample:

Apr 07, 2009 at 10:06 PM

weezintrumpete
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p.1 #10 · Rokkor 45mm f2

That looks great debuggerus. Any more samples? I also sent you a PM...

Apr 07, 2009 at 10:57 PM

JimU
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p.1 #11 · Rokkor 45mm f2

i'd like to see more samples as well please. about 1028x768?

i've got one on my minolta XG-1 but it's focus ring is kinda loose.

Apr 07, 2009 at 11:00 PM

debuggerus
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p.1 #12 · Rokkor 45mm f2

One correction: now that I look at the conversion, it is the same difficulty as the rokkor 50 1.4. I had to grind both the mount base and the M42-EOS adapter and adjusted infinity focus from the front in the end.

As request, a few more larger samples:

100% crop:

mounted on a 40D:

some more:

Apr 08, 2009 at 03:45 AM

weezintrumpete
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p.1 #13 · Rokkor 45mm f2

Wow, I am impressed and now very interested in doing this conversion

Apr 08, 2009 at 02:27 PM

debuggerus
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p.1 #14 · Rokkor 45mm f2

I've completed another 45mm f2 conversion. This time I managed to record the process.
The process should be similar with many other rokkors (50 f1.4, 85 f2, 28 f2, ...) using simpler tools (I wish I had a lathe). I hope it will be helpful.

45mm F2 to EOS conversion

Cheers!
PDo

Apr 21, 2009 at 02:51 AM

weezintrumpete
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p.1 #15 · Rokkor 45mm f2

Thanks for posting that! Does anyone else have any experience with the 45mm on EOS? I'm going to attempt the conversion soon...

Apr 21, 2009 at 03:09 PM

matthewm
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p.1 #16 · Rokkor 45mm f2

I really, really love this lens on my X700 so I think I'll keep it that way. Don't want to go cutting and gluing and messing around with a perfectly good lens. REALLY wanted this to use on my 5D, but I can't justify the trouble that it's most likely going to cause me.

Not to mention I don't have the tools to get it done properly.

Nice images though. And a GREAT tutorial.

Best,
Matthew

Aug 28, 2009 at 08:55 PM

Makten
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p.1 #17 · Rokkor 45mm f2

Lovely bokeh there! Just a trace of outlining of the blur discs, which makes it "interesting" but still smooth.

Edit: And of course; great shots of the kids!

Aug 28, 2009 at 09:22 PM

Jim Schemel
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p.1 #18 · Rokkor 45mm f2

Here is a set taken with my 45 Rokkor on a 5D
http://www.flickr.com/photos/footstool67/sets/72157622079471838/
Very nice lens great sharpness and color and very small and light
-Jim

Aug 29, 2009 at 04:38 PM

Cableaddict
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p.1 #19 · Rokkor 45mm f2

debuggerus wrote:
I've completed another 45mm f2 conversion. This time I managed to record the process.
The process should be similar with many other rokkors (50 f1.4, 85 f2, 28 f2, ...) using simpler tools (I wish I had a lathe). I hope it will be helpful.

45mm F2 to EOS conversion

Cheers!
PDo

Debuggerus, thanks for the excellent pictorial guide.

One thing puzzles me, though: You remove the aperture mechanism, and never replace it? How does that work? Is that mechanism only there for when the (Minolta) camera does auto stop-down?

Also: Any mirror issues? (I use a 5D, so this is always a concern)

thanks

Sep 17, 2009 at 07:07 PM

cogitech
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p.1 #20 · Rokkor 45mm f2

The aperture mechanism needs to be re-installed onto the back of the plate before assembly, or aperture control will be lost altogether. There should be no mirror issues to worry about.

Sep 17, 2009 at 07:50 PM

Dim.ka_
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p.1 #21 · Rokkor 45mm f2

Makten wrote:
Lovely bokeh there! Just a trace of outlining of the blur discs, which makes it "interesting" but still smooth.

Edit: And of course; great shots of the kids!

smooth bokeh is only at close to minimum focusing distaces at more common 1-2 meters it is quite busy, but has very strong 3d look

This image is copyrighted by the owner

upper part crop

This image is copyrighted by the owner

Sep 17, 2009 at 08:00 PM

Cableaddict
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p.1 #22 · Rokkor 45mm f2

cogitech wrote:
The aperture mechanism needs to be re-installed onto the back of the plate before assembly, or aperture control will be lost altogether. There should be no mirror issues to worry about.

Thanks, Paul.

I figured as much, but that tutorial fails to mention this step. ( ! )

In general, are there no mirror issues with MD lenses and a 5D? I'm considering a different MD lens. I will be doing a slight shave of my mirror anyway, for my upcoming MC 58/1.2 conversion, but it would be good to know. It's really hard to find this info online.

Thanks.

Sep 17, 2009 at 10:02 PM

cogitech
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p.1 #23 · Rokkor 45mm f2

I wouldn't generalize about all MDs, but the 45/2 didn't cause mirror issues for me and I haven't heard anyone else complain about it.

Sep 17, 2009 at 10:19 PM

Jim Schemel
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p.1 #24 · Rokkor 45mm f2

I also had no mirror issues with my 45 f2 on my 5D and achieved infinity focus with out adjustment
-Jim

Sep 17, 2009 at 10:22 PM

pengland
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p.1 #25 · Rokkor 45mm f2

How is the adapter attached to the reduced back in this conversion? I see no screw holes in the adapter so some other method must have been employed.That step looks to be missing.

After taking a second look I see mention of glue. If it is glued on, how does one carry out cleaning or repairs afterward?

Sep 17, 2009 at 11:24 PM


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