how does this work?

[back alley]

so says the ad...

This slip-on adapter ring allows for easy conversion to use your Ser.6 filters on your 43.5 filter size lens.

 

[Sonnar Brian]

You shove it on the lens and the prongs hold it in place. See the little breaks in the Metal Ring? They are the "grapplers".

 

[back alley]

do the prongs, grapplers go on the inside or outside of the barrel.
i have one of these and it does not fit either way.

joe

 

[denishr]

do the prongs, grapplers go on the inside or outside of the barrel.
i have one of these and it does not fit either way.

joe

Joe, the "push-on" adapters, like the one in the photo, are, just as their name suggests, pushed on the lens - i.e. the "prongs" go over the outside the barrel.
The other type of adapters, often referred to as "screw-in", are screwed inside the barrel, just like regular filters.
So, in order to determine which measure of "push-on" adapter you need for your lens, you need to take a measurement of your lens' OD (outside diameter).
Some lens are made with thicker, and some with thinner barrels, so you need to check.
I was lucky in several of my "other" lens: I can use Series VI filters with proper adapters for most of them.
With some others, I was able to make simple DIY modifications in order to use my Series VI filters.
For example, I needed a way to use my 52mm filters on some of my lens for which I had Series VI (44mm) adapters. I also had a Series VI-Series VII adapter (Series VII is 54mm). So I just inserted an empty (glassless) filter ring into this adapter (which has 54mm opening/thread), secured it with gaffers tape, and got a usable Series VI - 52mm adapter, with which I can use my 52mm accessories - filters, hoods, etc...

I could also post some photos for illustration of various solutions and uses...

Denis

 

[FrankS]

They are supposed to go on the outside of the lens barrel. They come in different diameters. The metal tabs can be bent in or out to fit if it is close, otherwise a different diameter adapter is needed.