Hood for Yashica ML 3.5/21

[IANUS]

Hello,
I got me a nice Yashica ML 21mm wide angle lens. I would like to equip the lens with a hood. I have seen somewhere in the internet (couldn't find the link) that there is a original rectangular slip on lens hood for this lens. I guess finding one such hood might be more difficult to find the lens itself.

Does anyone know where I could aquire this hood or is there a third party hood useable for this lens. Maybe I can use a step up ring and a larger hood.

Who is using this lens with hood. Btw. im shooting full frame slide film .

THanks, Tobias

[eddieitman]

What size is the filter ring?
Possibly a Konica Hood http://www.ebay.co.uk/itm/Black-Konica-24mm-28mm-Metal-Lens-Hood-OthersListed-/350476037628?pt=UK_Photography_CameraLenses_Lens_caps_hoods_adaptors_ET&hash=item5199ffedfc
Konicas are 55mm

[IANUS]