Alternate for Leica M Rear lens cap 14379

[rclompus]

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I use rear lens caps for all my Leica & Voigtlander lenses.  Labels of the focal length/max aperture are put on each cap to allow for quick selection from a camera bag or humidity controlled storage cabinet. Leica’s rear cap (14379) is best in class.  It is made of plastic that is just a little bit flexible so it grips the lens mount when tightened and it stays on.  Voigtlander’s lens caps are made from a more rigid plastic that doesn’t stay on the rear of M mount lenses.  Leica’s price for a rear cap is $45 USD.  I have tried generic rear caps from eBay and Amazon without success due to the plastic material being very rigid - similar to Voigtlander’s caps. I have not tried Light Lens Lab’s rear lens caps.  

Has anyone found an aftermarket rear lens cap that fits as well as Leica’s cap that doesn’t cost $45 each?

Many thanks,

Richard Clompus

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[Overgaard]

I have a number of 'nameless' caps from somewhere, or maybe old versions. Hate them, they don't sit that well and fall off. The original hard plastic you show here, really sits well and doesn't fall off in the bag. 

There must be a dealer somewhere who has a lot extra of them in the back who will sell you 10-20 for a good price.  

[graphlex]

Zeiss used to sell a ZM-branded lens cap for M-mount lenses. 

[farnz]

For many years I have used aluminium rear lens caps in either black or silver, which stay on very well.  They add no more weight than a plastic cap and, to my mind, offer far better protection to the rear element and it would be easy to add an identifying label if I chose to.  I found them on ebay and I feel sure that they'll still be available.  From memory they cost around £10 each although they're likely to be a little more expensive now.  The seller also offered deep caps for lenses that protrude a bit.

Pete.

[TomB_tx]

There are several designs for 3-D printed M caps on the "builder" sites on the web. Most I've found fit loose, but can be scaled to a snug fit, and can select a plastic material to suit. very cheap to make, and if you like darkroom work you may find 3-D printing relaxing as well. You can also make them in different colors to ID lenses.

Here are a couple I've tried that fit snugly after a slight "Z-axis" rescale. (Don't mind the color - just tried the material.)

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Edited September 12, 2024 by TomB_tx

[BruceRH]

I found these metal lens caps on eBay. They are very well made, light weight, fit perfectly and not overly expensive. 

https://www.ebay.com/itm/363436383909

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[farnz]

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9 hours ago, BruceRH said:

I found these metal lens caps on eBay. They are very well made, light weight, fit perfectly and not overly expensive. 

https://www.ebay.com/itm/363436383909

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They're the same ones I mentioned above that I've been using for years.  Thanks for the weblink.

Pete.

[jankap]

One should keep the original lens caps in the cupboard (or in the safe). I lost the original of 35 Euro and I bought a 3 Euro one on Ebay.  And now I want to sell the lens.🥲

[lct]

Voigtlander bottom lenscaps are my favorites as LTM to M converters are easier to unthread with them.