Macro extension tube for nikon d5100?

Macro extension tube for nikon d5100?

Added (1). Hi i have recently bought a macro extension tube for my nikon d5100 with 18-55mm lens? But for some reason after adding the extension tube between the camera n lens its dark n blur when i look through it and on the camera screen it says lens not fitted or attached. Any idea? Please advice. How do i make it work and how i set it up interms of getting rid of the drk blurness n even if i have to use it in manual mode but how exactly? Cheers

It must be a manual tube so you lost all automatic functions. Basically, you're in deep trouble but you already know it.

Focusing? Macro. Very close. Inches.

Dark? No aperture control. Lens defaults to smallest size. Without an aperture ring you're toast.

Not attached warning? Manual mode only. What settings? Learn photography.

Send it back. You bought the wrong type.

You need to buy one with the electrical contacts inside.

You should still be able to get an image in focus. It sounds like you're not close enough to something to see it in focus. You also need to understand that your depth of field is going to be around one inch or thereabouts.
You need to set the lens to it's minimum focusing distance and the zoom to 55mm. You should avoid using a focal length lens than 50mm with extension tubes.
Now, with the lens set to it's MFD, you will now focus down to less than 1 foot. The best way to focus is by moving the camera forward and back to get the subject in focus instead of focusing the lens.