IKONTA 520 lens removal

Spottymaldoon · Sep 26, 2008

I have to remove the second lens (counting from the front) from the Tessar combination in this f3.5 camera. I made a tool that has the shafts of two 1 mm drills to engage with the two holes in the lens mount (please see picture below):

http://richardleveson.com/IMG_0584.JPG

and so exert a CCW torque to (I wish!) unscrew this lens from its seat. BUT, the force I am having to apply seems too much and I am wondering if this lens is meant to come out another way? By my efforts, I have dinged the lens mount somewhat and don't want to make matters worse.

Please advise!

Spotty

elekm · Sep 27, 2008

You're correct. Sometimes, it takes considerable force to remove this rear element. You might want to try an old trick: Try to tighten and then loosen. This sometimes works, but of course could make it worse.

Paul Goutiere · Sep 27, 2008

Micro Tools sells wrenches called "flexicamps".

Measure the outside diameter of the lens and order the appropriate "flexiclamp". They will
not damage the delicate soft brass (if used very carefully) and enable you to exert considerable force.

elekm · Sep 27, 2008

Sorry, meant to say "middle element," not rear.

Spottymaldoon · Sep 27, 2008

IKON 520

Thanks for your moral support - I shall now proceed!

Spotty

JPD · Sep 28, 2008

If the abouv doesn't work, you could always put the camera in the freezer for a while, then warm the outer ring in the shutter with your fingers, and then try to unscrew the lens element. That works sometimes.

Spottymaldoon · Sep 28, 2008

IKONTA520

Thanks very much again. I shall remake my lens-wrench with some masking tape to protect the mount from scratches and give it a good hard turn. I am so lucky that the Canada balsam bonding the rear doublet of the Tessar is unblemished: however there are strange stubborn stains on the interior lens faces which I removed with <gulp!> Brasso - and it seems to have worked!

My shutter is working fine for the longer times but the ring won't turn past 1/100 sec.(the quickest is 1/300 sec.) - has anybody encountered this problem? I rather dread to take the mechanism apart.

I have refurbished the leather nicely, following advice here, but I have some edges where actual leather has chipped away and I should like to find a compound that can fill in those missing chips - somebody had mentioned 'latex' but I am unsure where to find that and also whether it will 'take' the black dye?

Again, your advice will be much appreciated.

JPD · Sep 28, 2008

Spottymaldoon said:
My shutter is working fine for the longer times but the ring won't turn past 1/100 sec.(the quickest is 1/300 sec.) - has anybody encountered this problem? I rather dread to take the mechanism apart.

The shutter has a booster spring that engages when you set it to the fastest speed. It can be rather stiff.

Spottymaldoon · Sep 28, 2008

Hooray! Emboldened by the good people here I have removed the lens - you have no idea what a thrill it was to feel that sucker coming loose as I held the knurled shutter housing in a gorilla-like grip and put the torque to my home-made wrench- many thanks to those who responded so helpfully. JPD, you also emboldened me on the stiff shutter and, sure enough, I applied a bit of extra torque and now the 1/300 sec. speed is working fine (thanks for the pictures too) - would you disagree with the use of a tiny dab of lubricant on that cam?

IKONTA 520 lens removal

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