jeffbuzz wrote:
Isn't the 150-400mm hood made of carbon? That should have a very minimal thermal effect. Much less than alloy would.
iirc..it was explained to me that the heat coming from the inside of the lens is dissipating/radiating through the front element which heats the air directly in front of the element. the air at the front of the lens hood is a lot cooler...two different atmospheric temps inside the lens hood.
i don't know how much, if any, of that holds any water but i do know that i never suffered with as temp issues with the smaller 4/300.
jeffbuzz wrote:
Isn't the 150-400mm hood made of carbon? That should have a very minimal thermal effect. Much less than alloy would.
iirc..it was explained to me that the heat coming from the inside of the lens is dissipating/radiating through the front element which heats the air directly in front of the element. the air at the front of the lens hood is a lot cooler...to different atmospheric temps inside the lens hood.
i don't know how much, if any, of that holds any water but i do know that i never suffered with as temp issues with the smaller 4/300.
Jan 17, 2024 at 02:32 PM
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