How to repair a bent brass lens hood...

[alex from holland]

I recently found a nice Dallmeyer 3a.
Unfortunately it's lens hood was bent at several places.
This is the way how I solved it.
http://collodion-art.blogspot.nl/2013/07/how-to-repair-bent-lens-hood.html

[pierre506]

Good method, Alex.

[Steven Tribe]

I notice you use plywood.
When I do this, I use sections of the very hard and tough african (?) woods used for wood flooring planking for outside terraces - readily available everywhere.

There is a technical problem with thicker types of lens hoods with fine threads for mounting ( I write from experience with Cooke IIE). If these hoods are taken off the lens for treatment, the torque produced by the compression is enough to distort the mounting thread, which is no longer in a perfect plane, and impossible to mount on the lens again. A small problem can become a bigger problem!

[alex from holland]

Steven ,

I have been using concrete multiplex. best quality one can get. Very hard and stiff.
So it won't bend o break.

Good point about the threads. In that case it might be safer to leave the hood onto the lens.
But for me it worked just fine and had no problems mounting it again.

[Steven Tribe]

I did think about leaving the hood in position when doing the "squeeze" but considered that this might result in completed jamed threads - for ever.

The Cooke IIE ended up with the perfect lens hood circle, but a mounting thread that was +/ - 0.5mm out of plane. I could rock it on a flat surface!

[m1tch]

You could always use the bent lens ring repair tool?

http://www.soonwell.com/images/201204/goods_img/210_P_1334594353059.jpg

[alex from holland]

Not really as the radius of these lenshoods are always different and these hoods
are much bigger (higher) than a lens ring.