No more trouble shooting tethered

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Lock Blocks


STEKK is a young brand based in The Hague, that helps photographers to prevent technical problems they face on a daily base. STEKK does this by developing smart tools and gadgets, such as the STEKK Lock Blocks. With this unique product, STEKK managed to find a solution for USB connection errors and physical damage caused by the cable connector during tethered shooting. 

Joost Koskamp, professional photographer and founder of STEKK, invented the Lock Blocks as he wanted to quit spending money on expensive repairs. “You think you just need to repair a USB-connector, but eventually face a bill of 800 euros, because the damage is more severe and the entire motherboard needs to be replaced”, he states. “But our Lock Blocks do more than avoiding damage. They let you move more freely while shooting tethered and minimize connection errors.”

For each camera model, STEKK designs, tests and hand-assembles a fitting Lock Block. This is why STEKK can only offer small batches of each Lock Block model. Luckily, our products are designed with the best materials; they will last a lifetime. 

TetherPro Cables


‘In September 2017 Joost made two Lock Blocks prototypes for Shoeby e-commerce studio. We work with Nikon D800E and Nikon D810 camera’s.” “I love to move freely, while shooting tethered.’ I can move around and follow my model with my camera. Every fashion photographer know’s that you need to freely move around while shooting. With the LockBlock I can create and enjoy a errorless data workflow while the raw images are popping up the computer screens with high speed.” “The Lock Blocks are amazingly reliable, we still work with the same prototypes every day now!”

Lindsy van GrinsvenHead of photography at Shoeby e-commerce studio.

As an adventurer and photographer I travel a lot with my equipment. Working on location provides you with a lot of external factors that influence your work. You want everything to function properly so that you can focus mainly on your work instead of on the technical aspects. When my camera’s USB connector had to be repaired, the invoice scared me out of my wits. Scandinavian repair prices are the highest of Europe. While briefly visiting Joost in his studio, he introduced me to the Lockblock. Ever since that I always keep my Lockblock in my camera bag. I can’t imagine working without it anymore.

Joel NieminenPhotographer @Helsinki and visual explorer.

“I have to say this little gadget is an absolute lifesaver! I’ve used it extensively over the last few months.” Before that I used to have massive connectivity issues just with the Tethertools cable. I bought a few different versions but that didn’t solve the problem. The cable kept falling out of the connecting socket. Then I used your LOCKBLOCK and NEVER had an issue, ever again. It’s bloody genius!!! I love it. So much so, That one time during my trip in Europe I couldn’t find it in my bag and thought .. aaaa…. let’s just shoot without…. and I completely regretted it. I had to stop the shoot, went through all my bags to find it. I found it and the shoot was awesome, cable never lost connection.“

Daniel SommerSydney's premier headshot photographer

STEKK - Lock Block - Canon 5D MarkIV


This STEKK - Lock Block is compatible with the Canon 5D MKIV camera.

STEKK Lock Blocks will protect your camera from USB connection errors and physical damage caused by friction between the cable connector during tethered shooting. You can connect the STEKK LockBlock and (Tether Tools TetherPro)* USB cable together in one second and all your connection problems are history. 

*NOTE: All LockBlocks are designed to fit with: Tether Tools TetherPro cables 

Suggestions: Also need an USB cable? These TetherPro cables are compatible with this Lock Block 

-Add standard 4,6M USB cable to your cart: (TehterPro USB 3.0 to Micro-B 4.6m Orange)

-Add 90° angle USB cable to your cart: (TehterPro USB 3.0 to Micro-B 4.6m Orange)

For computers equipped with USB-C connectors:

-Add USB-C cable to your cart: (TehterPro USB C to Micro-B 4.6m Orange)

-Add 90° angle USB-C cable to your cart: (TehterPro USB C to Micro-B 4.6m Orange

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