The DDC-42L Screw-Knob Dovetail Clamp from Sunwayfoto is an Arca-type compatible clamp that features an extended locking knob and a removable bubble level. There is a numbered scale on both sides of the clamp to help balance your camera with easy repeatability. The clamp is CNC machined from aluminum and has a satin anodized finish to provide abrasion and corrosion resistance. A 3/8"-16 to 1/4"-20 bushing reducer and an Allen wrench are included with the clamp.

Arca-Type Compatible    CNC-Machined Aluminum    Removable Bubble Level

The extended knob prevents cameras or wide plates from covering it, making locking and unlocking the clamp easier.

Safety-stop grooves allow you to adjust the plate's location without the plate accidentally being released.

Related Questions and Answers

Q: 1. Is it compatible with Sunwayfoto CR-30C ?

A: The Sunwayfoto DDC-26 Mini Screw-Knob Clamp is not directly compatible with the Sunwayfoto CR-30C. The CR-30C already features an Arca compatible mount. If one wanted to mount a camera using the the DDC-26, one could mount it onto the 1/4 20 male connector on a small Arca compatable quick release plate that would mount onto the Sunwayfoto CR-30C quick release clamp.

Q: 2. One of the reviews says there's a design flaw whereby the movable clamp is stuck when the clamp is mounted on a flat surface. All of my other clamps (Desmond and Kirk) have a tiny bit of clearance on the bottom of the movable part. Is this really a design flaw or a one-off problem with this reviewer's clamp?

A: When the Sunwayfoto DDC-60L Screw-Knob Dovetail Clamp is mounted on a flat surface it is difficult to tighten a plate, because the large knob cannot be tightened.

Q: 3. Two questions, really:1. Bill in GA wrote: It's being used to attach a Black Rapid strap to the camera so I can switch quickly from hand held to tripod. That sounds like precisely what I'd like to do, but I'm not actually sure I follow HOW this product helps Bill achieve that goal. How does the BlackRapid fastener fit into this equation, for instance? What am I missing..?2. I'm also planning on buying this clamp to replace the mini arca quick-release system on my MeFoto DayTrip tripod, in order to have consistent quick-release plates on all my tripods. So really, I'm just deciding whether I should buy one or two of these little guys. But I'd love to know if my plan for adapting my MeFoto tripod head won't work for any reason.Thanks!

A: Unfortunately, we are not sure what Bill in Georgia specifically is using, nor do we have the ability to inquire as to what type of setup he has made. However, Custom SLR produces a plate that is both Arca and Manfrotto compatible that would enable you to use a BlackRapid strap in conjunction with this clamp: http://bhpho.to/1tNH3SGAs for your second question regarding using this clamp with the MeFoto DayTrip, this is compatible.

Q: 4. Does this work with the Peak Design plate attached to the camera?

A: Yes, the Peak Design PL-S-3 Standard Plate and the Peak Design Dual Plate v2 for Capture Camera Clip should be compatible for use on the Sunwayfoto Macro Focusing Rail with Screw-Knob Clamp.

Q: 5. How does the rail mount to tripod?

A: The bottom of the rail has standard threads for mounting (like any camera) but the entire rail itself is compatible with any arca-type mount and this allows you to move the entire rail back and forth.

Q: 6. Can this mount on top of Sunwayfoto DDP-64SiX Indexing Rotator? Any other mounting hardware needed?

A: Jiawei, B&H asked me to respond to your question. Most of my ArcaSwiss plates and clamps are from Sunwayfoto; I have found them to of excellent quality and a lot cheaper than the brand names. I do not own the DDP-64SiX. However, from its photo on the B&H website, I see no reason this clamp won't mount; I have a several of these that I have mounted on tripods and monopods with configurations similar to that on the rotator. One possible issue I can see is that the long knob on the clamp may interfere with the release lever on the rotator. I recommend you try it to find out if it's satisfactory for you. Hope this helps.

Q: 7. where is this item manufactured?

A: According to the information in our system, the Sunwayfoto Macro Focusing Rail with Screw-Knob Clamp is manufactured in China.

Q: 8. Does anyone know if the the Varavon Armor GH4 cage will slide into this?

A: No problem. Perhaps all four edges of the dovetail plate are undercut, I'm not sure from the pictures. If they are all undercut then you could use the sunway clamp or any other clamp with no problem. Maybe if you pose that question to people who have purchased the cage and they could confirm. Regards.

Q: 9. Can this Sunwayfoto DDC-60L be mounted on top of a Bogen/Manfrotto hex shaped plate to convert my three way head to use Arca-Swiss type plates? Many thanks.

A: Yes, simple screw your hex plate to the bottom of this clamp.

Q: 10. I have macro lenses that have a collar and the plate is oriented perpendicular to the body plate. Is there a way to orient the sled to work with that lens plate?

A: If you attach an arca clamp with built in plate, it will work. Click the link to view; https://bhpho.to/3gpEy3a