wfrank wrote:
The mirror will actually leave some marks on the rear retainer ring where it hits. Sounds bad but I've seen no marks on the mirror itself yet :-)
Anyway, I have a photo of a grinded ring which should give you an idea how to do it. I'll take a look when I come home to see if I find it. Have not done it myself though, but I imagine it will no only solve the mirror-hit but also infinity-focusing. Mine b a r e l y focus at infinity, and it seem that this part of the ring is the culprit both for the mirror-hits and that.
Maybe someone else can confirm?
(5DMkII - 58/1.2 - in my case old metallic version)...Show more →
So if yours was destructively converted, such that yours barely reaches focuses at infinity, then the silver ring may need more sanding.(Jim's kit has a machined ring)
see this ring below http://www.cogitech.ca/Rokkor/img_1304.jpg
This is the rear retaining ring being filed to help clear the mirror. (extreme caution if doing it this way, and use vinyl electrical tape to protect the element) http://www.cogitech.ca/Rokkor/img_0561.jpg
That does not look like the ring that needs sanded.The one that needs sanded is the one that actually holds the rear lens element in place and unscrews very easily.
-Jim
Thanks for the illustration, James. I haven't grinded the reatainer ring of mine yet (too anxious) and cannot reach infinity without stopping down to f8 or f16. My mirror hangs frequently if I'm not very cautious. The above images were taken with the 5MK2, but I'm experimenting also with a Nex. A FF sensor seems to fit this lens better although...
Mine is a EOS convert as I mentioned. I works fine to 0-5m (which really is where I use it), but occationally I'm finding a subject further off. Then the mirror hangs. The normal result is that the image is taken, but sometimes I get a vignetting due to the mirror hang. Not always though, just the hang.
I have very clear marks on the retainer ring so I know where it hits. If you check the diamond-shaped mark on the lens - the center of the aperture scale which is the top when the lens is mounted - you'll find that it hits on the upper side of the ring.
When focusing beyond 5m the ring protrudes further back. Hence the marks. Here's an image I found on the net on a grind (hope I dont break any copywrights - this is for the good of the alt community). This - I hope - for my conversion version should definitively do away with the mirror hits, and I suspect also the infinity focus.
Reason for the latter is that when I look into the 5D2 house, the upper part where the matte lever (word?) resides is the most protruding part on the house (a mm or so above anything else). So if top part of the lens' retaining ring is grinded back possibly half a mm or so - that would also be enough for infinity focus as (my copy) is really close to it as it is.
EDIT: If you pay attention to the red dot and the focusing scale, you'll realize that this lens is focused on infinity (more or less). Hence the black retainer ring is farthest back. When focusing on close distance, nothing protrudes above the silver ring in the image. Left is straight up on the camera.
Ulff wrote:
Did you sand the retainer ring you're speaking of down, Jim? And did you succeed in reaching infinity and avoiding mirror hangs?
Yes i did sand down the retainer ring... the results that i get now are at infinity it will catch the mirror on the return to resting position and all i have to do is slightly turn the focus and it releases.Before i sanded the ring it would catch on the way up and would affect the exposure.Its my understanding that catching the mirror on the way down is the best we can do with this lens on a Mark I, with a 5D Mark II with live view it is not an issue.That said i will try and sand the ring a bit more and see if i can avoid it hitting at all.
crazeazn wrote:
great shots Jim, I see your 5d+35/2 FT on POTN
I pulled it off.I think i will hang on to both of them, just trying to figure out a way to get a larger file size without having to come up with some more cash.
-Jim
Ulff wrote:
Minolta 58mm f1.2: first one wide open, the second one probably at f2.0.
Love the first one, very tasteful comp of the super bokeh compared with top notch sharpness. If this thread had a front image my vote would go to that shot
freaklikeme wrote:
Love this one, Phillip. Great choices made all the way around.
thanks, when i took that picture i wasn't even aware of it's potential
btw: you might like to have a look into my minolty gallery, some of those pictures have already been posted.
Those are great shots Paul, any info on apertures? #2 has a similar 3D-ness for me as Phillips dog-shot, but I think he used an FF on that one. So especially nice since coming from a crop sensor!
wfrank wrote:
Those are great shots Paul, any info on apertures? #2 has a similar 3D-ness for me as Phillips dog-shot, but I think he used an FF on that one. So especially nice since coming from a crop sensor!
phillip's dog shot was also taken on the NEX, it says so on the image frame.
