iShootLens Collar Tripod Mount Ring Support Holder BracketCompatible with Sigma 105mm f/1.4 DG HSM Art (EF/FX/FE/L Mount) & Sigma 100-400mm f/5-6.3 DG DN OS (E/L Mount) Lens, Bottom is Arca Fit Plate

I realized there aren't any reviews on this product right now, but wanted to leave my two cents on this lens collar.Setup: I'm using this product with the Sony A7iii and the Sigma 100-400 DG DN OS for Sony E-Mount. Have not tried it with the Sigma 105 or any other version/mounts of the 100-400.Feedback: This is essentially an alternative to the $130 Sigma TS-111. At half the price, it's hard to find any issue that would justify that cost difference. It fits perfectly, tightens, and supports the lens/body. I have this with a sony a7iii and haven't experience any issues. Fit and finish on the mount were fine and the piece feels sturdy. It does have slots that align perfectly with the bumps on the lens that allow it to slide and lock in place.TLDR: This is a perfectly fine alternative that will support the lens without costing an arm and a leg.

The plastic glued gasket is only secured on one side. It moved already from original position from one outing. I also purchased the original TS-111 ring and the plastic gasket is secured on both sides with small grove so it won’t move. This iShoot mount ring released glue already and that glue is also all over the lens. Also the lens was used outside in about 40 degrees F weather. I wonder what would happen in hot weather? This faulty construction can easily scratch and damage lens very soon. Returning.

Exceeded my expectations in all areas. I can't find any reason to purchase the lens manufacturers over this product. This unit is extremely sturdy

Super sturdy, high quality, and easy to install.I'm especially fond of the angle to help balance the weight as I use this on the Sigma 100-400mm lens.

Rock solid collar on my Sigma 100-400 lens. I like the design of the foot better than the original Sigma one. And was cheaper than the original Sigma collar. What's not to like?

Bought this for my Sigma 100-400 lens, and it's working great. Stays on my lens permanently. Sigma TS-111 costs $130, which is more than twice cost, and not any sturdier.

High quality fit and finish. Has stoppers to prevent a loose clamp from letting your camera find the ground.

I got this to mount my Sigma 100-400 mm lens. I had to remove the rubber ring from the lens which I was not very confident about doing, but it now works very well. I have just stowed the rubber ring. This collar provides a solid mount on a tripod or monopod, making the lens much more useable, especially with manual focus for low-light shots. And it was a fraction of the price of the brand name alternative.

I bought this for my Sigma 100-400mm emount lens for my Sony a6000 camera. It fits extremely well, and is a very smooth and solid construction.

Used with a Sigma 100-400mm lens the bracket balances the lens perfectly

アルカスイス互換もしっかりしていて、純正並みの扱いができるかと思います。剛性、精度ともに良いと感じます。何より見た目がいいです。SIGMA100-400 DG DNに取り付ける際は、鏡胴にあるゴムリングを外して取り付ける形になるので、レンズ本体に外した時外に見えるようなスレが付かないのもいいですね。