Plz help me to fine the adapters

[Jiney]

I heard there are adapters that will connect the A Medium format to A Lens.
But It's not easy to find the reliable adapter for me.
Please, tip me to find the one.
As I already have a 800mm lens(by KOWA), I'm looking for the adapter which can connect the one to Mamiya AFD II or III body.
If there is no ready made one, can I make it by a specialist or company?
You should recommend the other lenses to be connected to above Mamiya body.
They must be at least 300mm lenses.

 

[tirediron]

It's all about budget. As far as I am aware, there are no adaptors which will allow you to mount your Kowa lens on an AFD II body. You could have one made, but that would be very expensive given how accurate and detailed the machine work has to be (probably several times the cost of a high-end prime telephoto).

The longest lens of which I am aware for your camera is the 500mm f5.6 which appears reasonably often on eBay and generally sells in the $3-4000 USD range.