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trev
Joined: 30 Jun 2010
Posts: 580
Location: North Wales - UK
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 Posted: Sat Jul 24, 2010 3:35 pm Post subject: Lens hood removal |
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trev wrote:
Any ideas folks? Got this Panagor 35-100 zoom lens which I bought with a "jammed on" lens hood. The lens hood is metal and I JUST cannot shift it without doing either the lens or the hood some damage. I'd leave it on but theres nowhere to screw on a polarizing filter etc etc.
Help please
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Fuji X10, X-A1 and Samsung nx 20 |
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peterqd
Joined: 28 Feb 2007
Posts: 7448
Location: near High Wycombe, UK
Expire: 2014-01-04
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| Posted: Sat Jul 24, 2010 4:46 pm Post subject: |
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peterqd wrote:
Often a hood won't unscrew because it distorts when you grip it. Try pressing down the front rim of the hood onto a grippy rubber surface, such as a rubber glove, and turning the lens instead. Or if you can get hold of one, try using one of those tools for undoing screw lids.
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trev
Joined: 30 Jun 2010
Posts: 580
Location: North Wales - UK
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| Posted: Sat Jul 24, 2010 4:49 pm Post subject: |
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trev wrote:
Tried that to no avail, am now wondering in some idiot glued the blasted thing on, or perhaps its cross threaded and being metal to metal !!!!!!!!
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Fuji X10, X-A1 and Samsung nx 20 |
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RioRico
Joined: 12 Mar 2010
Posts: 1120
Location: California or Guatemala or somewhere
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| Posted: Sat Jul 24, 2010 5:17 pm Post subject: |
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RioRico wrote:
Try squirting graphite powder on the threads. I wouldn't recommend using any volatile thread-unsticker like WD-40 because it might foul the objective. Try using a rubber or sticky plastic ball, whose diameter is just larger than the lens hood's, to get a grip on the hood when unscrewing it. And if all else fails, just cut the hood away.  Good luck.
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Too many film+digi cams+lenses, oh my -- Pentax K20D, K-1000, M42s, more
The simple truth is this: There are no neutral photographs. --F-Stop Fitzgerald |
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themoleman342
Joined: 21 Oct 2007
Posts: 2190
Location: East Coast (CT), U.S.A.
Expire: 2013-01-24
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| Posted: Sat Jul 24, 2010 5:38 pm Post subject: |
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themoleman342 wrote:
I've cut away filters with great success and no damage to the lens. The metal is typically thin enough to just be bent inwards until the whole thing pops out. Just a last resort option.
~Marc |
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WolverineX
Joined: 19 Apr 2009
Posts: 1693
Location: Zagreb , Croatia , Europe
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| Posted: Sat Jul 24, 2010 5:41 pm Post subject: |
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WolverineX wrote:
can you post a photo of the lens? maybe you'll get better suggestions how to remove the hood
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http://forum.mflenses.com/wolverinex-testing-my-lenses-series-link-list-t39524.html |
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visualopsins
Joined: 05 Mar 2009
Posts: 11058
Location: California
Expire: 2025-04-11
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| Posted: Sat Jul 24, 2010 5:56 pm Post subject: |
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visualopsins wrote:
Some untested ideas (i.e. try at own risk!) spring to mind:
Immerse hood in ice water to create temperature differential between hood and lens, so hood metal contracts and pulls away from surrounding lens metal. Hood may easily unscrew.
If oxidation has cemented the surfaces together, use Alumina to dissolve it:
| Quote: |
Alumina removes grease, oil, grime and oxides on all types of aluminum and aluminum alloys. It does not contain fluorides and operates at a pH of 5.1 to 6.1. Alumina is non-toxic, non-corrosive, biodegradable and does not contain acids or alkalis. It is non-flammable and contains no petroleum solvents.
...
BENEFITS AND FEATURES:
* Non-Fluoride formulation
* Rapidly removes oxide from aluminum and aluminum alloys
* Non-corrosive
* Non-flammable
* Biodegradable
* Contains no VOC’s or HAP’s
* Contains no solvents, acids, bases
* Easy and safe to use
* Safe on soft metals, plastic, rubber, PVC and other surfaces unharmed by water alone |
http://www.orisonmarketing.com/corrosion/alumina/alumina.html
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