sticky aperture

[Caussway]

Bought a 50mm F1.7 with fungus and decided to clean it myself. Manage to disassemble the lens and clean the fungus. But the aperture blades are sticky. The spring seems OK and even the aperture blade doesn't feel sticky when I actuate it with my finger. Hope to hear from gurus here how to rectify this problem. Should apply some oil

[BBTM]

Originally Posted by Caussway Bought a 50mm F1.7 with fungus and decided to clean it myself. Manage to disassemble the lens and clean the fungus. But the aperture blades are sticky. The spring seems OK and even the aperture blade doesn't feel sticky when I actuate it with my finger. Hope to hear from gurus here how to rectify this problem. Should apply some oil

Hand itchy har? If no guru can help, think you got to bring back to KMSC for service. I ever want to try to take out the screen from my D7 but in the end, I stopped becos I ever did a "checking" on a GOLD plated AIWA walkman. Now spoilt liao, so heart pain. Brought $450 during 1993. Saw someone selling over 1k for it at ebay! Too bad, mine is spoilt, just keep it for display lor.

[Drudkh]

Originally Posted by Caussway Bought a 50mm F1.7 with fungus and decided to clean it myself. Manage to disassemble the lens and clean the fungus. But the aperture blades are sticky. The spring seems OK and even the aperture blade doesn't feel sticky when I actuate it with my finger. Hope to hear from gurus here how to rectify this problem. Should apply some oil

Consult Sulhan, he's the expert in breaking things up and put it back in 1 piece in working condition.

[TME]

Originally Posted by Caussway Bought a 50mm F1.7 with fungus and decided to clean it myself. Manage to disassemble the lens and clean the fungus. But the aperture blades are sticky. The spring seems OK and even the aperture blade doesn't feel sticky when I actuate it with my finger. Hope to hear from gurus here how to rectify this problem. Should apply some oil

The bold parts dun tally... something missing in between?? What's the problem? Cleaning the sticky aperture blades or putting the lens back together again?

[Caussway]

I already put the lens back and it's working fine, except the aperture blades.
Still sticky .

Originally Posted by TME The bold parts dun tally... something missing in between?? What's the problem? Cleaning the sticky aperture blades or putting the lens back together again?

[dynaxattack]

Originally Posted by Caussway I already put the lens back and it's working fine, except the aperture blades. Still sticky .

Gungho,

you should have seen a lens manufacturing line....how well they are protected from dust and finger prints. gloves and mask are compulsory. Wonder why??

[TME]

Originally Posted by Caussway I already put the lens back and it's working fine, except the aperture blades. Still sticky .

Seriously dynaxattack is right... did u use gloves? U need to clean the blades with cleaning solution (maybe lens solution will do) to remove all the gunk from your fingers... if that was done I think may be the mechanism rather than the blades... maybe it's time to visit the hospital...

[Caussway]

I bought lens cheap so don't mind experimenting on it. I use lens cleaning liquid and soft cloth used for cleaning spectackle to clean it. Yes there specs of dust inside the lens, I can't do anything about it - no cleanroom in my house . Will Post pictures taken wide open later. The apeture blade assy is not easy to dismantle, not going to do that, Worst case will just use the lens wide open for low light and reverse macro

Originally Posted by TME Seriously dynaxattack is right... did u use gloves? U need to clean the blades with cleaning solution (maybe lens solution will do) to remove all the gunk from your fingers... if that was done I think may be the mechanism rather than the blades... maybe it's time to visit the hospital...

[Caussway]

Here is the af50mm 1.7 assy



Picture taken after put them back

[sulhan]

Hieee..

One way to check if the aperture springs are olay and non sticky problem...
insertign the rear cap and turn to lock will actuate the aperture as follows...



rgds,
sulhan

[Drudkh]

Originally Posted by sulhan Hieee.. One way to check if the aperture springs are olay and non sticky problem... insertign the rear cap and turn to lock will actuate the aperture as follows... rgds, sulhan

will you be opening a class to teach how to draw all these?

[TME]

Sulhan, is that done as a gif or via flash?

[Caussway]

Sulhan you did that yourself, wow you're real guru man.

The aperture blade is confirm sticky. I use pen to turn it open, it cannot close back.
But when I remove the top plate the spring action is very smooth. It always return perfectly. When I turn the aperture without the top plate, it doesn't feel sticky neither

Should I change the spring to a shorter / stiffer one ?

Originally Posted by sulhan Hieee.. One way to check if the aperture springs are olay and non sticky problem... insertign the rear cap and turn to lock will actuate the aperture as follows... rgds, sulhan