Lens rear cap for Contax RF, Nikon S, Kiev RF (Lens Cap)
Lens rear cap for Contax RF, Nikon S, Kiev RF (Lens Cap)
Availability for pickups could not be loaded
Sustainability Promise
Sustainability Promise
All our products are made from PLA – a material derived from sugarcane and corn that is 100% biodegradable.
Free shipping in Germany
Free shipping in Germany
With free shipping to your home in 2-3 days.
30-day money-back guarantee
30-day money-back guarantee
You can test any product for 30 days. If you are not satisfied, we will refund the full purchase price including shipping costs. No ifs, ands, or buts.
- Rear lens protection: Safely preserves the delicate glass element from dust, dirt, and scratches.
- Exact fit for the inner bayonet: Designed for the Inner Bay system, which is used almost exclusively by 50mm standard lenses in the Contax-RF and Nikon-S mounts.
- Replacement for the often missing original cap: Suitable rear cap for classic rangefinder lenses that need protection without a cover.
Important note on fit
This rear cap is exclusively suitable for the inner bayonet (Inner Bay). This system is used almost only by 50mm standard lenses. Wide-angle (e.g., Biogon, Jupiter-12) and telephoto lenses (e.g., Sonnar 85mm/135mm) usually use the outer bayonet – for these, you need a different cap (Outer Bay).
Compatibility
Fits lenses with Contax RF / Nikon S / Kiev RF inner bayonet (Kiev RF uses the same Contax-RF bayonet), including:
- Carl Zeiss Sonnar 50mm f/1.5 & f/2
- Jupiter-8 50mm f/2
- Jupiter-3 50mm f/1.5
- Helios-103 53mm f/1.8
- Nikon Nikkor-S 5cm f/1.4 (and other 50mm Nikkors for Nikon S)
Scope of delivery
- 1x rear lens cap (Inner Bay)
Technical details
- Material: plant-based bioplastic (PLA+)
- Color: black
- Mount: Contax RF / Nikon S inner bayonet
Share

We are Anto & Vladi
Support a young startup
You want innovative solutions instead of mass-produced goods? With us, you don’t buy from an anonymous wholesaler, but directly from the founders. We (Anto & Vladi) started our startup in 2021 in Würzburg to help you revive analog photography.
Developed by engineers
Quality made in Germany
We don’t sell anything we wouldn’t use ourselves. We are engineers and camera nerds, and we know that precision is especially important in camera technology. That’s why every single part is designed and thoroughly tested by us here in Würzburg.
From Germany to the whole world
Fast DHL shipping
You don’t want to wait forever for your item? Every product is personally made fresh for you in Würzburg on the day of your order, checked, packed, and shipped worldwide. As soon as you place your order, your package is almost on its way to you with the fastest shipping options from DHL and Deutsche Post.