• Front side - 52mm inner diameter
• Rear side - M62x0.75 male thread
• There is the additional M50x0.75 female thread inside

This adapter allows using Kowa Prominar Anamorphic 16-H attachment in front of lenses with M62x0.75 filter thread.

The inner diameter of the adapter is 52mm, so it fits the attachment perfectly (we prefer perfect fit instead of 'universal' solutions with long screws).

The adapter has a female M50x0.75 thread at the bottom that is purposed to engage the Kowa rear mount thread. This is the safety measure. When the lens as held by this thread, there is no risk of dropping it accidentally when you loose the clamp screws.

Recommended installation procedure:

1. Mount the adapter into a lens filter thread until stop.
2. Insert Kowa attachment accurately into the adapter and screw it into the bottom thread fully.
3. Turn the Kowa counterclockwise to achieve a squeezed image without skew.
4. Secure the Kowa with three screws of the clamp.

Sample setup shows how the whole assembly may look. Two marked positions are our adapters - filter adapter (available separately if necessary) and attachment to lens adapter (clamp) that is for sale in this listing.