The PB-2850FO Replacement Foam Set from Porta Brace is a cubed foam set that is a replacement for the original supplied with the PB-2850 series Safeguard Field Production Vault cases.

Fits PB-2850 Hard Cases    Cubed Foam    Replacement Item

High-density cubed foam

Replacement item

Compatible with Porta Brace PB-2850 series Hard Cases

Related Questions and Answers

Q: 1. Hi there, some questions:1- Is the mounting BAYONET (not external ring which seems metal) of each extension tube made of metal or plastic?2- If it's metal, can you tel if it's aluminum or something stronger/sturdier? 3- Can someone tell if these are better or worse (in build-quality) than the Kenko Auto Extension Tube Set DG for Canon (which are bit more expensive)?Thank you very much in advance!!

A: They are metal, not plastic. Don't know what kind of metal but it's strong. About the same quality as Kenko. I use mine regularity and they work great.

Q: 2. will these fit on a nikon 200mm macro lens?

A: Yes

Q: 3. Will these work with the Olympus 17mm 1.8?

A: Although we have not tested the extension tubes with every MFT lens on the market, this combination should work well together.

Q: 4. Will this set work with the Canon M50?

A: Not natively. You will need an EF to EF-M adapter like this one: https://bhpho.to/2JzdjIK

Q: 5. I have a Nikon D3200 and a Sigma DC 18-250 lens, 1:3.5-6.3. Are these extension tubes compatible with this set up and if they are, are there any issues at all that I should be concerned with?

A: These extension tubes will be fully compatible with the D3200 and Sigma 18-250 lens. The extension tubes will allow you to focus closer than the set minimum focus distance of the lens. There will be some light loss when using extension tubes. Adding about 40% of the lens focal length will result in the loss of 1 f/stop. Additionally, focus to infinity will be lost.

Q: 6. Will this extension tube work with the Sony E-Mount 18-200mm f/3.5-6.3 Zoom Lens on my Nex 5N Camera?

A: Yes, I use them on that same lens.

Q: 7. hi, would the kenko extension work with the NIkon D3100, I read on another post that they did not.... . does anybody know?

A: The Kenko Extension DG B&H # KEAETSND should work fine on the D3100 as long as you have a lens that will let enough light in for it to autofocus, if the lens hunts for focus just go to manual and focus that way. This is true on all cameras as per lenses. You may have little problems with zoom lenses, but with experience you will learn the how to adjust to any situation. I use them on a D7100 and love them.

Q: 8. Why does my 18-135mm Canon EFS lens not autofocus with these extension tubes?

A: The Vello Auto Extension Tube Set for Canon EF/EF-S Mounts and Lenses will have an extremely narrow area that can be focused--you might be slightly too close or slightly too far away; even a few millimeters difference can cause the focus to be lost. Always try to use a tripod for macro photography.

Q: 9. I have a 100 mm macro lens and want to use these extension tubes with it. Is the seal between THE TUB AND THE LENS secure and tightly fitted? Another set I have is loose and I cannot use it for fear of lens falling off..This probably applies to other lens also and not just the 100 mm macro.. Thank you.

A: I'm using a set of Kenko Extension tubes with a 100mm 2,8L lens and its not loose at all.

Q: 10. Hello, What is the difference between the $129 and the $79 Extension Tubes? Thank you.

A: If you are referring to the Kenko tubes, there isn't any difference, just different manufacturers.