Disassembly and reassemly a Minolta MD Zoom 35-70mm 1:3.5 lens. This is the 3rd generation with macro. Multiple parts of the lens have fungus so need to be thoroughly cleaned.
Пікірлер: 16
@airship9637 Жыл бұрын
Thank you for a most informative and detailed lens disassembly. Question for you. On my copy of this lens, when the camera/lens is horizontal, the macro setting is stable as I focus. When I aim the camera/lens straight down, the macro setting drifts from 1:7 to 1:4. Is this normal for the lens or is there an adjustment that can be made to prevent this? Otherwise, I am very pleased with this lens and it stays on my camera 90% of the time.
@atlantisq Жыл бұрын
Mine only shifts if you shake the lens. It should be possible to mitigate this by re-lubricating the zoom helicoid (the cylinder with a lot of tracks carved in it), but I don't think it's worth the effort of taking the entire thing apart.
@user-gm7hf3ey5l11 ай бұрын
Thanks for the detailed teardown. I too attempted the disassembly for basic cleaning but now i cant get a sharp image across the frame. The image is sharp in center while the area in mid is smudgy and the corners & edges gets very blurry. This is most apparent on 35 mm. Also on 35 mm i am not able to focus anything closer than 4-5 meters. I am confused what wrong did i do. This makes me so sad, have i screwed up the lens beyond repair ? Any tips on troubleshooting will be so much helpful 🙏
@atlantisq11 ай бұрын
See if you put in any elements backwards. There are a couple elements on this lens that are kind of symmetric and easy to get wrong.
@user-gm7hf3ey5l11 ай бұрын
@@atlantisq I cross checked couple of times & all elements have been placed in the required orientation.
@atlantisq10 ай бұрын
@@user-gm7hf3ey5l The issue as you described definitely looks like the optics are not assembled correctly, so it may very likely be fixable.
@user-gm7hf3ey5l10 ай бұрын
@@atlantisq Okay, i will let you know if i get to fix this out.
@elteuben2 ай бұрын
Hi there, do you know if this same procedure is valid for the MD Zoom 28-85?
@atlantisq2 ай бұрын
No two lens models are the same, but these two (28-85 and 35-70 III with macro) are released around the same time, so chances are they are mechanically similar. Looking at the optical formula on lensQAworks, the 28-85 seem to also have 3 groups, so you might find a lot of similarities. Good luck.
@atlantisq2 ай бұрын
The mount mechanism is most likely the same across the two lenses. I've taken apart a few Minolta lenses and they have been pretty easy.
@elteuben2 ай бұрын
Thanks for the reply, and for mentioning that source. My 28-85 has a sticky aperture mechanism, so I'll see if I can fix it
@atlantisq2 ай бұрын
@@elteuben For sticky aperture you might only need to go in from the mount end of the lens and see if the lubrication is sticky or the spring is old.
@-NHAN-KHO10 ай бұрын
Hi bro. My lens is not focus at infinity correct. How to fix it? At 35, 70 to. im trying my best. All the time it out focus
@user-ze9lh4se7j10 ай бұрын
I have the 2nd generation 35-70 and the entire focusing part is loose. I tried to fix it, but found a ring on the inside of the focusing part seen fromt the front, that can't be made to sit in one position without eventually moving when I focus. Thus the focusing assembly can be move back and forth a littke bit by just pulling/pulling throwing it out of focus. Any suggestions?
@atlantisq10 ай бұрын
diediemustdive.wordpress.com/2016/12/03/minolta-md-zoom-35-70mm-f3-5-disassembly-and-cleaning/ This tutorial deals with a second gen 35-70. I think it might be the setscrews on the focusing ring.