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  1. #1
    Senior Member
    BF Hammer's Avatar

    Modifying a Sigma 150-600mm Contemporary lens

    Many of us have the Sigma 150-600mm C lens. It's one of the best value super-telephotos out there. For all of it's great points, it does have a shortcoming in the tripod foot. Literally, it's too short.

    Don't we just have to install a long Arca-Swiss quick-release plate and it's all good? Not quite there. Here is the lens tripod collar removed.

    Modifying a Sigma 150-600mm Contemporary lens-20220625_10.jpgModifying a Sigma 150-600mm Contemporary lens-20220625_09.jpg

    Problem we have here is that there is only a single threaded hole for mounting the Arca plate. For a lens of this weight with the foot nowhere near the balance point, simple gravity pull will make the lens twist free at a bad time. It's also a poor handle for carrying the lens. As an aside, Kirk Photo has a different solution to this, and I would recommend that for those unwilling to take a drill to an aftermarket part like I am going to discuss here. Link at the end of post.

    There is available on Ebay and sometimes Amazon or Ali Express an aftermarket lens collar for this particular lens. I bought one years ago as my solution to the lens twisting. It has a built-in Arca-Swiss mount foot.

    Modifying a Sigma 150-600mm Contemporary lens-20220625_08.jpgModifying a Sigma 150-600mm Contemporary lens-20220625_18.jpgModifying a Sigma 150-600mm Contemporary lens-20220625_17.jpgModifying a Sigma 150-600mm Contemporary lens-20220625_19.jpg

    It is shaped more squared than the OEM collar, so it can be too tight for fingers at the handgrip if the lens is rotated to that direction. It also is far too short to properly balance, even when at the 150mm position. On a gimbal head, this just won't do.

    Ideally the foot needs to be about 125-130mm long. That reaches the balance point at 600mm and a typical Arca-Swiss clamp will fully contact. I cannot find a plate that length in my searches. 150mm would do, they are a lot more rare to find than 120mm Arca plates. I am doing my mod here with a 120mm long plate that I had as a spare in the house. The 120mm mount plate is going to replace the iShoot lens collar foot.

    Modifying a Sigma 150-600mm Contemporary lens-20220625_20.jpg

    I already did my drilling before the photo shoot. It involved removing the 2 screws holding the iShoot foot, and using the holes as my template to drill the holes into the Arca plate. I had to move holes a bit forward by a millimeter or 2 so they could clear the thick material at the edge. I removed the safety stop screws and taped the plates together, placed into a vice, and put the drill bit through the original plate's holes and started drilling the holes. I removed the guide and finished drilling the holes. I used some machine oil to lubricate the drill bit here. Even with all this the holes became offset to one side just a bit. I had to cut them a bit oval to make things line up. I had to test-fit and adjust the holes a couple of times before it was right.

    Modifying a Sigma 150-600mm Contemporary lens-20220625_16.jpgModifying a Sigma 150-600mm Contemporary lens-20220625_22.jpg

    The finished modification. This is a very minimalist mod, and completely reversible for the lens. Even the 120mm Arca plate could be used otherwise for the most part. I can balance the lens at 600mm in my gimbal now, but I have to move this back about 5-6mm in the Arca-Swiss clamp so it is not fully gripped. But it's gripped about 90%, which is fine for this lens. And just as important, you can use it as a proper carry handle. It's balanced in the hand and does not fatigue your grip. This may not be the right solution if you are carrying your rig on a sling.

    Modifying a Sigma 150-600mm Contemporary lens-20220625_15.jpgModifying a Sigma 150-600mm Contemporary lens-20220625_13.jpgModifying a Sigma 150-600mm Contemporary lens-20220625_14.jpgModifying a Sigma 150-600mm Contemporary lens-20220625_11.jpgModifying a Sigma 150-600mm Contemporary lens-20220625_12.jpg

    Now here is the Kirk Photo solution using the original lens collar and foot. They sell an Arca plate with a bar that rests against the edge of the foot to prevent the lens from twisting free. Their recommended product for this Sigma lens is in this link.
    https://kirkphoto.com/lens-mounting/sigma/150-600mm-f-5-6-3-dg-os-hsm-contemporary/lens-plate-for-sigma-150-600mm-f-5-6-3-dg-os-hsm-contemporary.html

    I however recommend a different plate they sell that is more generic. The recommended plate is still a problem as it is not the recommended 130mm or longer. I think this one would work better, but it includes more parts on it that needed.
    https://kirkphoto.com/lens-mounting/...late-5-25.html

    Modifying a Sigma 150-600mm Contemporary lens-klp5251_2.jpg


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    Thanks/Like Dangerspouse, Peter7100 Thanks/liked this post
     
    Cameras
    Z5
    D750
    D600 (infrared converted)
    Lumix DMC-ZS6
    Nikon Lenses
    Nikkor Z 24-70mm f/4 S
    24-120mm f/4
    50mm f/1.8G
    70-200mm f/2.8G VR
    28-105mm f/3.5-4.5D
    500mm f/8 reflex
    Other Lenses
    Carl Zeiss 15mm f/2.8 Distagon
    Sigma 20mm f/1.4 Art
    Sigma 150-600mm f/5.6-6.3 C
    Tamron 90mm f/2.8 Di VC USD



  2. #2
    Senior Member
    BF Hammer's Avatar

    Re: Modifying a Sigma 150-600mm Contemporary lens

    An attempt to show the balance points of the lens at 150mm and 600mm. This is with a D750 plus an attached L-bracket mounted. This is a heavier back-end than you would have with D3400 or similar smaller body camera, so I would expect that at 600mm it would be necessary to slide even further to the rear. That is why I recommend a plate longer than 120mm long.

    150mm mounted to Wimberley Sidekick gimbal
    Modifying a Sigma 150-600mm Contemporary lens-20220701_01.jpg

    600mm, we have moved 3-4mm further back than the plate fits inside of the clamp
    Modifying a Sigma 150-600mm Contemporary lens-20220701_02.jpg
    Thanks/Like Dangerspouse Thanks/liked this post
     
    Cameras
    Z5
    D750
    D600 (infrared converted)
    Lumix DMC-ZS6
    Nikon Lenses
    Nikkor Z 24-70mm f/4 S
    24-120mm f/4
    50mm f/1.8G
    70-200mm f/2.8G VR
    28-105mm f/3.5-4.5D
    500mm f/8 reflex
    Other Lenses
    Carl Zeiss 15mm f/2.8 Distagon
    Sigma 20mm f/1.4 Art
    Sigma 150-600mm f/5.6-6.3 C
    Tamron 90mm f/2.8 Di VC USD

  3. #3
    Senior Member
    Challenge Team
    Needa's Avatar

    Re: Modifying a Sigma 150-600mm Contemporary lens

    Nice write up.





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