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12-23-2014, 08:32 AM   #1
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Dissambling A 400 5.6

I own this 400 mm for a while, and noticed the 2nd or 3rd elements from the front side have some fungus. I removed the front element, but that does not give me entrance to the affected surfaces.


Has anyone experience in disassembling the front side of this objective?


There are three tiny x-screws at the tube in the middle, but they are too tied to unscrew withoud harming the inner profile.


thnx


Henrico


Last edited by Henrico; 12-28-2014 at 06:41 AM.
12-28-2014, 07:07 AM   #2
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I became this far, the fungus is in between lens 2 and 3, especially at the center aerea where 2 and 3 are allmost in contact with each other.

I tried to unscrew the fronttubeout of the outer tube, the front tube is reaching a just few mm out of the sun cap when it's not extended, but it seems locked very tied. I do lack any grip to force it.
My thoughts are it must be possible to remove the sun cap but it's cought around the tube.
There seems no screwing rings in the inner part of the tube.

Has anyone the right suggestion for me to get in between 2 and 3 ?
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12-28-2014, 10:04 AM   #3
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I don't know if this will help or not, but have a look:

https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/203304-how-...0mm-5-6-a.html
12-28-2014, 10:42 AM   #4
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QuoteOriginally posted by baro-nite Quote
I don't know if this will help or not, but have a look:

How to clean A400mm 5,6?
The link doesn't seem to tell how to open up the front part either.
The good: those elements should be accessible.
The bad: I haven't got a clue how.

Seb

09-26-2015, 12:56 PM   #5
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Finally could unscrew it....

I got some advice from an expert, he told me to cut two 2mm slots with a grinder at the front tube, so I could put much more force to unscrew. I fixed the other side with duck tape and a screwdrawer and still needed WD40 to make it going.


I cleaned all with pure alcohol, removed the oil and fungus, and now it's clear as new....!
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Last edited by Henrico; 10-02-2015 at 01:41 AM.
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