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Telephoto Lenses with focal lengths longer than 60mm.

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Jammed lens hood on the f4 300mmPro

Has anyone managed to get a jammed lens hood on the f4 300mm Pro?

Nothing obviously happened when it was extended, but now seems to jammed solid.

I am warming the lens up on a very slightly warm radiator to see if any expansion of the hood helps. Any other suggestions appreciated...…...
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Olybirder Olybirder is online now
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Re: Jammed lens hood on the f4 300mmPro

Touch wood it hasn't happened to me yet. However I have found that it is easier to turn the hood by pinching it between my forefinger and thumb on one side and twisting it. If you hold it by both sides and attempt to turn it I think it can be deformed slightly which makes it harder to turn.

Ron
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Re: Jammed lens hood on the f4 300mmPro

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Originally Posted by Olybirder View Post
Touch wood it hasn't happened to me yet. However I have found that it is easier to turn the hood by pinching it between my forefinger and thumb on one side and twisting it. If you hold it by both sides and attempt to turn it I think it can be deformed slightly which makes it harder to turn.

Ron
Worked first time...……………….Very many thanks....
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Re: Jammed lens hood on the f4 300mmPro

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Originally Posted by MJ224 View Post
Worked first time...……………….Very many thanks....
Wow, I thought it was worth a try but I wasn't really convinced it would solve your problem. Glad it worked for you.

Ron
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Re: Jammed lens hood on the f4 300mmPro

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Wow, I thought it was worth a try but I wasn't really convinced it would solve your problem. Glad it worked for you.

Ron
I know some will recoil in horror at this suggestion but...... Silicone G|rease or Silicone Spray Lubricant applied very carefully and thinly works wonders on plastic to plastic or plastic to metal.

A light spray on a piece of cotton wool then applied to the barrel of a zoom lens cures stiffness when zooming etc. the same applies to many types of lens hoods.

Conversely, normal oil causes plastics to bind.

Just a thought

Jax
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Re: Jammed lens hood on the f4 300mmPro

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Originally Posted by Jax View Post
I know some will recoil in horror at this suggestion but...... Silicone G|rease or Silicone Spray Lubricant applied very carefully and thinly works wonders on plastic to plastic or plastic to metal.

A light spray on a piece of cotton wool then applied to the barrel of a zoom lens cures stiffness when zooming etc. the same applies to many types of lens hoods.

Conversely, normal oil causes plastics to bind.

Just a thought

Jax
One of the easiest places to find silicon spray is Mr Sheen Furniture polish!
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Re: Jammed lens hood on the f4 300mmPro

I have got a can of Silicone Spray somewhere. I use it on my curtain rails to make it easier to open and close the curtains and it works like magic.

I don't think I will use it on the 300mm lens hood just yet as I haven't had a problem with it jamming. In fact I actually have the opposite issue. I keep my camera in a holster and I find the action of taking it out and replacing it tends to undo the hood after a while. I have to keep checking that it is still extended properly. It would be nice if it clicked into position but then it would probably give more problems with jamming.

Ron
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Re: Jammed lens hood on the f4 300mmPro

I wouldn’t use silicone lubricants on a lens body. Silicones are known to migrate and are difficult to remove, making a mess of an optical surface if they got onto it. If applied to the barrel of a zoom lens, I would worry about them migrating inside the lens and affecting the electronics or aperture mechanism. If you want to try, use the tiniest quantities only.

Definitely don’t use mineral oil based lubricants on plastic.
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Re: Jammed lens hood on the f4 300mmPro

Any 3rd party replacement for this?
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Re: Jammed lens hood on the f4 300mmPro

I've had this problem with my 12-40 - only seems happens when it's really cold! And I can't tell with the problem is frozen fingers or a structural issue with the lens cap.
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Re: Jammed lens hood on the f4 300mmPro

Had this happen with my 300mm f4, even before I'd ever attached it to the camera.
Gently warming the lens hood with a hair dryer, soon released it.
In case you're all wondering... no I don't carry a hair dryer in my camera bag

Mark
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Re: Jammed lens hood on the f4 300mmPro

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Originally Posted by Mark_R2 View Post
I wouldn’t use silicone lubricants on a lens body. Silicones are known to migrate and are difficult to remove, making a mess of an optical surface if they got onto it. If applied to the barrel of a zoom lens, I would worry about them migrating inside the lens and affecting the electronics or aperture mechanism. If you want to try, use the tiniest quantities only.

Definitely don’t use mineral oil based lubricants on plastic.
I suspect that a silicone treatment is applied during the manufacture of lenses. Silicone treated surfaces have a characteristic slippery 'feel'. Also, water droplets bead off a new lens is a way that suggests silicone to me.

I have a can of 'dry' silicone spray that I occasionally apply to a tissue and then wipe my zoom lens barrels. I also do the same to the hood bayonets.

Jim
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Re: Jammed lens hood on the f4 300mmPro

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Originally Posted by Jim Ford View Post
I suspect that a silicone treatment is applied during the manufacture of lenses. Silicone treated surfaces have a characteristic slippery 'feel'. Also, water droplets bead off a new lens is a way that suggests silicone to me.

I have a can of 'dry' silicone spray that I occasionally apply to a tissue and then wipe my zoom lens barrels. I also do the same to the hood bayonets.

Jim
Couldn't agree more ! The chances of correctly applied silicone causing any harm to a lens must be less than winning the lottery 3 times in a row. As stated, it's already used on the seals and "O" rings by the manufacturer. The topic has been raised many times but nothing will ever convince some people.

Given the amount of plastics and neoprenes used now, silicone in it's varying forms, is the most useful lubricant out there.

Jax
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