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Archive 2008 · Yet another Canon FL55 1.2 to EOS convert

cogitech
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p.2 #1 · p.2 #1 · Yet another Canon FL55 1.2 to EOS convert

tmessenger wrote:
It my be sample variation for my converted lenses but my FL 55/1.2 is sharper wide open the my Rokkor 50/1.2 and I did do a careful test, but the Rokkor is still a keeper.

Tim

I thought we were talking about the Rokkor 58/1.2.

BTW, Tim, I'd like to see how you converted the Rokkor 50/1.2 and some sample shots.

Sep 15, 2008 at 06:18 PM

Silentlight
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p.2 #2 · p.2 #2 · Yet another Canon FL55 1.2 to EOS convert

Is there any difference between FL 58/1.2 and FL 55/1.2?

Sep 15, 2008 at 10:48 PM

Alf Beharie
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p.2 #3 · p.2 #3 · Yet another Canon FL55 1.2 to EOS convert

Silentlight wrote:
Is there any difference between FL 58/1.2 and FL 55/1.2?

Yes, the 58mm is an older lens and it was replaced by the 55mm.
The 58mm has a more complex iris mechansim making it more difficult to convert than the later 55mm.

Sep 16, 2008 at 12:44 AM

JimBuchanan
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p.2 #4 · p.2 #4 · Yet another Canon FL55 1.2 to EOS convert

An addendum to this thread shows a refinement of my method of Canon FL 55 1.2 lens conversion. As I was hired to convert another lens, I took the opportunity to turn down the helicoid assembly as described by Alf Beharie. The benefit of this is not only better precision, but eliminating the need of a spacer between the lens and m42-EOS adapter, and not having to mess with the helicoid mechanism at all.

Shown, is the rear of the helicoid assembly and M42-EOS adapter, after 2mm was removed. The infinity focus stop is also seen with the 3 slot screws, and was ultimately used to fine tune infinity.

http://farm4.static.flickr.com/3196/2902905742_47e0eea06c_o.jpg

As per suggestion of tmessenger in the above issue of “pink fringing”, to eliminate any flare or reflections caused by light bouncing around the mirror box with wide apertures, or brighter scenes, or closer distances where the lens assembly moves out front and exposes the stock chrome threads of the M42-EOS adapter, certain areas were painted flat black to eliminate reflections.

http://farm4.static.flickr.com/3122/2902064589_8a67f5f545_o.jpg

Sep 30, 2008 at 08:45 PM

pdmphoto
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p.2 #5 · p.2 #5 · Yet another Canon FL55 1.2 to EOS convert

I've been saying it for a couple years now - those unpainted reflective adapters can cause problems with bright scenes, wide open apertures, and with wide angles.

Sep 30, 2008 at 11:36 PM

wiregen
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p.2 #6 · p.2 #6 · Yet another Canon FL55 1.2 to EOS convert

I'm really surprised with Alf's image samples vs yours Jim. Chroma is definitely present, I think it could be partly with the lens design.

I was chatting with Jim regarding conversion of the 50mm 1.2L FD

Like the 50mm 1.2 SSC aspherical The rear element is considered the "floating" element. This element is crucial to retain the sharpness and reduce chroma on the aspherical FD lenses. Problem is on how to mount this.

I'm still trying to find a solution. I was thinking machining off the rest of the rear element mount, but the question is how much. I don't currently have the time to keep experimenting with it. But, I figured it anyone dares attempt to convert FD mounts to be aware of the difficulty.

I posted some test shots I took without the rear element below.


	http://farm4.static.flickr.com/3269/2904386200_05f265168a_b.jpg


	http://farm4.static.flickr.com/3134/2904385924_9eb8e1efe5_b.jpg

Here's it mounted on my 5D. It does go over infinity so a spacer needs to be added.


	http://farm4.static.flickr.com/3235/2903551171_633df50251_b.jpg

Oct 01, 2008 at 03:18 AM

cogitech
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p.2 #7 · p.2 #7 · Yet another Canon FL55 1.2 to EOS convert

JimBuchanan wrote:
As per suggestion of tmessenger in the above issue of “pink fringing”, to eliminate any flare or reflections caused by light bouncing around the mirror box with wide apertures, or brighter scenes, or closer distances where the lens assembly moves out front and exposes the stock chrome threads of the M42-EOS adapter, certain areas were painted flat black to eliminate reflections.

http://farm4.static.flickr.com/3122/2902064589_8a67f5f545_o.jpg

I always do this when converting Rokkors, etc. Some flat black Tremclad works great.

Oct 01, 2008 at 08:08 AM

Alf Beharie
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p.2 #8 · p.2 #8 · Yet another Canon FL55 1.2 to EOS convert

JimBuchanan wrote:
An addendum to this thread shows a refinement of my method of Canon FL 55 1.2 lens conversion. As I was hired to convert another lens, I took the opportunity to turn down the helicoid assembly as described by Alf Beharie. The benefit of this is not only better precision, but eliminating the need of a spacer between the lens and m42-EOS adapter, and not having to mess with the helicoid mechanism at all.

Shown, is the rear of the helicoid assembly and M42-EOS adapter, after 2mm was removed. The infinity focus stop is also seen with the 3 slot...Show more →

Question is, has painting those areas matt black actually made any difference to the resulting images?

Oct 01, 2008 at 01:37 PM

Alf Beharie
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p.2 #9 · p.2 #9 · Yet another Canon FL55 1.2 to EOS convert

manowar wrote:
I have both of the lenses, FL and Rokkor. Didnt have a chance for a proper test but from the results taken from both lenses, the Rokkor is obviously much much far better than the FL55, IMHO.
Sorry to say but I found nothing amazing from this FL55 but it's still a keeper.

So far, I have'nt seen a single sample from the Rokkor where it shows any gain in IQ over the FL...I wonder if you are using your FL via one of those IQ reducing FL/FD-EF optical adapters?...That would explain the poor results you are getting with your FL. Would it be possible for you to post some head to head comparison pics?

Oct 01, 2008 at 01:47 PM

Ed Sawyer
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p.2 #10 · p.2 #10 · Yet another Canon FL55 1.2 to EOS convert

the FL seems to have a lot more coma wide open, at least.

Oct 02, 2008 at 12:05 PM

hibernum
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p.2 #11 · p.2 #11 · Yet another Canon FL55 1.2 to EOS convert

Interesting work. I am still trying to remove the front trim ring to get at the infinite stop, with no luck. Are you guys using any special tools, because it doesn't seem like it will budge. Thanks much.

Oct 13, 2008 at 12:49 PM

tmessenger
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p.2 #12 · p.2 #12 · Yet another Canon FL55 1.2 to EOS convert

I use a plastic pvc pipe with a rubber inner tube over the end of it. This will give you enough traction on the trim ring to get it to turn loose.

tm

Oct 13, 2008 at 03:04 PM

tmessenger
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p.2 #13 · p.2 #13 · Yet another Canon FL55 1.2 to EOS convert

I'm getting OK results with my FL55 wide open.

tm

Ed Sawyer wrote:
the FL seems to have a lot more coma wide open, at least.

http://www.iowatelecom.net/~tmdesign/bb.jpg

Oct 13, 2008 at 03:21 PM

manowar
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p.2 #14 · p.2 #14 · Yet another Canon FL55 1.2 to EOS convert

Few snaps bokeh test

Oct 13, 2008 at 05:03 PM

Empire
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p.2 #15 · p.2 #15 · Yet another Canon FL55 1.2 to EOS convert

tmessenger,
I'd say that that is more than just ok results. It looks very much like rokkor sharpness to me and it certainly has smooth bokeh!

Holding my un converted FL 55/1.2 infront of my 20d gives results that look every bit as good as my rokkor. Infact i have a suspicion that with my particular copies the FL is actually the better performer... it certainly delivers more consistant results throughout the f stops.

not bad for a lens I paid US$65 for with a 'free' FT QL...

just my 2p

Oct 13, 2008 at 10:13 PM

Dim.ka_
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p.2 #16 · p.2 #16 · Yet another Canon FL55 1.2 to EOS convert

Here is canon fd version

Minolta

Alf please understand - Sigma sd14 Foveon gives that character that you have with your canon lense.
On 5D perfomance of this canon lense is not stellar

http://www.flickr.com/photos/convert1/page2/

The other thing i am not using rokkor 58 1.2 on Sigma anymore - the reason is simple - f1.2 on such crop 1.7 useless instead i have converted minolta md 50mm f1.7 and will do minolta md 35mm f1.8 convertion.

Oct 14, 2008 at 03:18 AM

JimBuchanan
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p.2 #17 · p.2 #17 · Yet another Canon FL55 1.2 to EOS convert

Dim.ka_, do you have the other pages to these lens tests? Canon FD 50L, for example? Or, the FD 50/1.2 aspherical?

Oct 14, 2008 at 04:21 AM

Dim.ka_
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p.2 #18 · p.2 #18 · Yet another Canon FL55 1.2 to EOS convert

Yes i have the whole test, but there are no other canon lenses.

Oct 14, 2008 at 05:11 AM

Alf Beharie
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p.2 #19 · p.2 #19 · Yet another Canon FL55 1.2 to EOS convert

Dim.ka_ wrote:
Here is canon fd version
http://album.foto.ru:8080/photos/or/41852/204440.jpg

Minolta

http://album.foto.ru:8080/photos/or/41852/204441.jpg

Interesting charts. Is the 55mm f1.2 SSC listed the aspherical version?

Alf please understand - Sigma sd14 Foveon gives that character that you have with your canon lense.
On 5D perfomance of this canon lense is not stellar

http://www.flickr.com/photos/convert1/page2/

The other thing i am not using rokkor 58 1.2 on Sigma anymore - the reason is simple - f1.2 on such crop 1.7 useless

Why do you think its useless?

Oct 14, 2008 at 03:22 PM

Dim.ka_
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p.2 #20 · p.2 #20 · Yet another Canon FL55 1.2 to EOS convert

The rear lense is so big in diameter that you can not see any difference between 1.2 and 1.8 - from f2 you can say that aperture blades start working.
So decide to convert smaller lenses. Already done MD 50mm 1.7
http://i20.ebayimg.com/06/i/000/fe/f8/fb66_1_sbol.JPG

tommorow will do md 35mm 1.8
http://photohaus.de/Ebay-Fotos/IMG_Y1893.JPG

Oct 14, 2008 at 03:45 PM

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