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Clear lens caps
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PostPosted: Thu Jan 02, 2025 10:28 am    Post subject: Clear lens caps Reply with quote

Having read up about the benefits of exposing lenses to light to prevent fungus it occured to me that translucent lens caps might be useful?

Any thoughts?

I have 3D printer so might have a go at knocking sone up.


PostPosted: Fri Jan 03, 2025 8:06 am    Post subject: Reply with quote

I think lens caps used to be black to prevent film exposure when shutters were this and that. Digital times I can not see a reason why not transparent?


PostPosted: Fri Jan 03, 2025 12:50 pm    Post subject: Reply with quote

I can see a reason for lens caps on lenses attached to cameras to be black - sunlight through the lens focused on a shutter or sensor could damage them through heat but lenses stored off camera... I can imagine transparent lens caps would help keep fungus at bay.


PostPosted: Fri Jan 03, 2025 2:36 pm    Post subject: Re: Clear lens caps Reply with quote

Vintage_Photographer wrote:
Having read up about the benefits of exposing lenses to light to prevent fungus it occured to me that translucent lens caps might be useful?


I have no idea where that comes from. Anyone leaving a source of food in the open (i. e. in plain light) can see that fungus will start to grow, in spite of the light. And yes, I do have lenses which A) were stored without lens cap and B) *did* get fungus.

Maybe someone confused the "healling" effect of UV light on radioactive lenses with the fungus problems?!?

S


PostPosted: Sat Jan 04, 2025 2:28 am    Post subject: Re: Clear lens caps Reply with quote

There are a lot of misconceptions about lens fungus out there . The most pervasive is that fungus "jumps" from lens to lens . If you expose a lens to conditions in which fungus will grow, fungus will grow. The spores are everywhere.

That said, fungus does indeed grow better in dark settings, but it -can- grow in the presence of light if other conditions are ideal, i.e., ones that are warm and damp.

So clear caps might help a little? But probably not nearly as much as a humidifier/air conditioning where they are stored will.


stevemark wrote:
Vintage_Photographer wrote:
Having read up about the benefits of exposing lenses to light to prevent fungus it occured to me that translucent lens caps might be useful?


I have no idea where that comes from. Anyone leaving a source of food in the open (i. e. in plain light) can see that fungus will start to grow, in spite of the light. And yes, I do have lenses which A) were stored without lens cap and B) *did* get fungus.

Maybe someone confused the "healling" effect of UV light on radioactive lenses with the fungus problems?!?

S