Third Party Lenses

The Funleader 18mm f/8 Cap Lens is now available for the RF mount

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The Funleader 18mm f/8 cap lens was first launched on Kickstarter back in 2019, and it was quite successful raising about $35,000 USD.

The lens itself is an 18mm full-frame tiny pancake lens with a fixed aperture of f/8 that doesn’t require autofocus. It has a depth of field from about 2.6feet to infinity, so you can just point and shoot and everything should be in focus.

I ordered one of these to try out. I don’t expect L lens quality, but I do like to switch up the look of my shots at the lens instead of in post.

You can now purchase the Funleader 18mm f/8 cap lens on ebay for the RF mount, as well as Sony’s E-Mount and Nikon’s Z-Mount. It’s relatively affordable for what it is at about $149 USD.

Funleader 18mm f/8 Cap Lens at ebay (when i started this post, it was in stock. It’s currently showing as out of stock for the RF mount)

You can also buy directly from Funleader here.

FUNLEADER Cap Lens 18mm f/8 Technical Specifications

  • Focal Length: 18mm
  • Aperture: f/8.0
  • Field of view: 100°
  • Closest focusing distance: 0.8m
  • Construction: 6 elements in 4 groups
  • Coating: Multi-coated
  • Body material: Brass
  • Finishing: chrome plating
  • Weight: 80g
  • Size: 62mm × 15mm


Dec 17, 2013
It's true, this craft needs more fun. Unless of course you're into pain and like arguing about C Logs and such. Disdain over Lensbabies and pinholes is ricockulous. I love this idea, esp for the R crowd which doesn't have enough silliness to play around with. Oh film, you had it all (except computers)
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EOS 5D Mark IV
CR Pro
Oct 18, 2011
So you can make pancake lenses 24mm and less for ff cameras! :eek::LOL:

Have to admit I'm surprised how undistorted the example images look.
This looks like a cracking little fun lens no wonder it's selling out


Mar 20, 2015
It’s always been possible with cameras that don’t have to fit a mirror between the mount and the image plane.

And also for cameras that do have a mirror. Voigtlander 20mm pancake.

If anything it's easier with a longer register distance.
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EOS 5D Mark IV
CR Pro
Oct 18, 2011
And also for cameras that do have a mirror. Voigtlander 20mm pancake.

If anything it's easier with a longer register distance.
Indeed, tbh not sure about easier though


CR Pro
Aug 29, 2016
I hope they will appear again for the RF, this is just what I needed <3
Sold out for RF on their site and eBay...
Sold out of RF mount at Funleader site as well

You guys fall at the first hurdle.....

So here's what I did as the RF version was out of stock. I bought the Canon Drop-In filter mount adapter with the variable ND which allows you to mount EF lenses on the R5.
Next I purchased the Metabones EF to Sonny E Mount T smart adapter (Mark V) which I connected to the first adapter.
Having done all of that, I was then able to purchase the Sonny e-mount version for $149 and mount it to my R5. With the adapters and the Funleader lens, it's now the same size as the EF300mm on my R5, but i do get the benefit of the variable ND to control the amount of light hitting the 45 megapixels....

Really guys, you just lack a little imagination ;-)
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Reactions: 2 users


May 30, 2015
Curious to see what the images are like. I have an old Olympus E-P3 body with their 15mm f8 bodycap pancake lens on it, and I have to say its a blast and quite liberating. It's the only Olympus stuff I kept. Its got a look that is fun and its just easy to point and click for both stills and HD video.
I'm just surprised how much they cost now - I got mine for $49 CDN years ago, and now they are much more. I suppose they are popular now.


It's not the gear. But it helps.
CR Pro
Apr 18, 2013
Colorado, USA
Maybe Canon will come out with an RF lens cap something like the EF 40mm f/2.8 STM. But there are probably a lot of other things higher on the priority list. ;)