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.
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.
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.
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.
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.
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.
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.
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 screws, and was ultimately used to fine tune infinity.
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.
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?
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.
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...
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
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.
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
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
