For Sale: Pentax Reverse Adapter

Pentax 52 mm Reverse Adapter K. In original box with instructions. £20

Hi, at the risk of showing utter stupidity - what does this do? I have seen the phrase used but never understood exactly what it does, why I should want one.

Given that it's only £20, I might be tempted if I knew what I could do with it

If you have a prime lens (e.g. a 28mm or 50mm) you can mount it backwards onto the camera to give very high magnification macro facilities

Ideally you'll have some extension tubes as well - so you might have camera+tubes+reverse+lens

You'll get awesomely close! Great for bugs and beasties

Obviously with this one you'll need a filter thread of 52mm on the prime to make it work!

EDIT: If you want to try it, just hold the lens back-to-front over the K-mount hole in the camera. You'll have to open up the aperture on the lens too (so it'll need an aperture ring)

Matt

To add to what Matt has written. The shorter the focal length of the lens, when reversed, magnifies more than a longer focal length lens.

If you can imagine that a 28mm lens, when used normally has a wide angle of view which it makes smaller to fit your sensor/film size. So, when it's reversed, it has the reverse effect of making very small things look very big. A 50mm lens has a narrower field of view than a 28mm lens, and similarly, when reversed, it doesn't magnify as much.

Using reversed lenses produces razor thin depth of field though, but that's not a problem because if you get 'the macro bug' you'll be looking at focus stacking very soon.

When I didn't have a macro lens, I used it with a Tokina 28/70 zoom reversed and got some really good shots from the combination. It was a bit fiddly but was effective. With the lens removed from the camera mount, it effectively operates in stop down mode - I think that this is the same with all Pentax mount lenses where there is an f ring.

John

PM Sent for reverse adapter 52mm

Thanks guys for thre explainations - all makes sense.

Payment sent for adapter

Thanks. This item has been sold.

John