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Need help - disassembly Minolta 85mm D

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paso144 View Drop Down
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Post Options Post Options   Quote paso144 Quote  Post ReplyReply Direct Link To This Post Topic: Need help - disassembly Minolta 85mm D
    Posted: 06 April 2019 at 11:43
Guys, need some help. Purchased a 85mm D version. However there is some fungus on the the back and front elements which I want to clean. I've partially teared it down but got stuck and don't want to force anything. Can see somebody worked on it before me so better check all of it since also the rear element is a bit wobbly.

Does anyone have a repair manual for this lens. I have Pete's CD but the Maxxum 85mm AF is significantly different in build-up.

Edited by paso144 - 06 April 2019 at 12:07
A850, 16fish-eye, 17-35G, 28-70G, 50/1.4RS, 58/1.2, 85/1.4D, 80-200/2.8APO black, 100macroD, 100-300APO, 100-400APO, AT-X304, 500mirror, 5600D HS.
 



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stiuskr View Drop Down
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2019 at 20:34
The only thing I can find is what you already have for the 85 AF. Can you post some pics of where you are now in the teardown and maybe we can get you past that step.
Rob Suits Jr.
a99M2 a99 a77 a700 KM7D|Min24/2.8 Min35/2 So50/1.4 So50/2.8 Min85/1.4G Tam90/2.8 Tam180/3.5|Tam17-50 CZ24-70G2 KM28-75D So70-200G1 So70-300G So70-400G1| SonyF60 AD200R2
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amrep View Drop Down
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Post Options Post Options   Quote amrep Quote  Post ReplyReply Direct Link To This Post Posted: 07 April 2019 at 09:52
I disassembled and repaired a 85mm D some years ago. I think the repair manual for that spesific lens in not easy available. I took some advice from the old repair manual you already have. Basic design is not that different. But the SAL85F14Z might be even more similar.
https://elektrotanya.com/sony_sal85f14z_ver.1.5.pdf/download.html

Nothing special really. You remove the front elements (those in front of the aperture) from the front and the rear groups from the rear ;-) The flex cable is a bit disturbing and not so strong.
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Post Options Post Options   Quote paso144 Quote  Post ReplyReply Direct Link To This Post Posted: 07 April 2019 at 10:54
Thanks will have a look.
A850, 16fish-eye, 17-35G, 28-70G, 50/1.4RS, 58/1.2, 85/1.4D, 80-200/2.8APO black, 100macroD, 100-300APO, 100-400APO, AT-X304, 500mirror, 5600D HS.
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Post Options Post Options   Quote paso144 Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2019 at 22:16
Continued working on the 85mm since I still want to clean it from some fungus spots on the front element and what looks like oil deposit on the inside of the back element.



I've disassembled the front holding ring and cover ring (needed some drilling out of one of the three small screws, went well). Expected to find a way to remove the front element with this but I'm puzzled to find nothing.



Looks like I'm down to the bare element and nothing is holding it. Should the element be able to be released now from the metal barrel? If I look at the file of Peter Ganzel on the old 85mm it looks that way.

Also I found some older posts which describe the front element falling out after removing the retainer ring. Makes me even more think it should be removable now. Anyone have any tricks on this, like heating-up (just an example don't know if I will go that route ).
A850, 16fish-eye, 17-35G, 28-70G, 50/1.4RS, 58/1.2, 85/1.4D, 80-200/2.8APO black, 100macroD, 100-300APO, 100-400APO, AT-X304, 500mirror, 5600D HS.
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Post Options Post Options   Quote paso144 Quote  Post ReplyReply Direct Link To This Post Posted: 16 October 2019 at 13:48
Nobody able to advice
A850, 16fish-eye, 17-35G, 28-70G, 50/1.4RS, 58/1.2, 85/1.4D, 80-200/2.8APO black, 100macroD, 100-300APO, 100-400APO, AT-X304, 500mirror, 5600D HS.
 



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amrep View Drop Down
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Post Options Post Options   Quote amrep Quote  Post ReplyReply Direct Link To This Post Posted: 16 October 2019 at 17:29
I think the front element should come off now when you have taken off the filter and hood mounting ring. Put a soft towel or similar on your desk, turn the lens upside down and knock it gently with the other hand. (The professional repairer may use a suction cup.)
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Basil View Drop Down
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Post Options Post Options   Quote Basil Quote  Post ReplyReply Direct Link To This Post Posted: 16 October 2019 at 21:20
You beat me to it. I was going to suggest something like this. You don't want to pry along the edge with anything.
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paso144 View Drop Down
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Post Options Post Options   Quote paso144 Quote  Post ReplyReply Direct Link To This Post Posted: 16 October 2019 at 21:32
@Anrep, yep, done this or at least tried this, can try a bit harder or get de vacuum plug Basil suggests.
A850, 16fish-eye, 17-35G, 28-70G, 50/1.4RS, 58/1.2, 85/1.4D, 80-200/2.8APO black, 100macroD, 100-300APO, 100-400APO, AT-X304, 500mirror, 5600D HS.
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2019 at 00:02
You should be able to find one at an auto parts supply store in the paint and body section, look/search for a small dent puller.
Rob Suits Jr.
a99M2 a99 a77 a700 KM7D|Min24/2.8 Min35/2 So50/1.4 So50/2.8 Min85/1.4G Tam90/2.8 Tam180/3.5|Tam17-50 CZ24-70G2 KM28-75D So70-200G1 So70-300G So70-400G1| SonyF60 AD200R2
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Post Options Post Options   Quote Maccroft Quote  Post ReplyReply Direct Link To This Post Posted: 18 October 2019 at 19:54
Would think something like this would work.
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Post Options Post Options   Quote amrep Quote  Post ReplyReply Direct Link To This Post Posted: 18 October 2019 at 20:32
You should try to investigate why the front element isn't falling out.
Some suggestions on what to look for:
- The barrel no longer perfectly round? (Check the ring you have taken off for dents.)
- Any kind of sticking compound at the elements periphery?
- Corrosion in the barrel where the front element is seated?
(Also, if the element has slightly unseated it may have tilted and jammed.)

I am not so sure a suction cup will be able to apply more force than a sharp smack on the lens.
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Post Options Post Options   Quote paso144 Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2019 at 20:35
Hey guys, I'm still stuck at disassembling the front element. I've purchased the suction cup with which I really can apply a lot of retraction force. However the element does not come out. I was wondering whether the element isn't mechanically locked since I see two marks on the side which look like a metal connection is applied. Anyone seen this before and have an advice?

@Amrep; the barrel doesn't seem distorted or corroded, also I don't see strange substances inside.

1) Disassembled till bare front element


2) Mark on one side


3 Mark on opposite side
A850, 16fish-eye, 17-35G, 28-70G, 50/1.4RS, 58/1.2, 85/1.4D, 80-200/2.8APO black, 100macroD, 100-300APO, 100-400APO, AT-X304, 500mirror, 5600D HS.
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Post Options Post Options   Quote paso144 Quote  Post ReplyReply Direct Link To This Post Posted: 30 October 2019 at 08:52
This type of construction makes me wonder if the metal barrel is part of the front element and I need to take it out as a whole (don't know how since I do not have a cross-section drawing). Contradicting to this is that I can see another retainer ring with slots directly underneath the front element to hold the second element. This would imply I can take out only the glass section of the front element
A850, 16fish-eye, 17-35G, 28-70G, 50/1.4RS, 58/1.2, 85/1.4D, 80-200/2.8APO black, 100macroD, 100-300APO, 100-400APO, AT-X304, 500mirror, 5600D HS.
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