Nikon CS-9 Soft Case Teleconverter but you may notice some

but you may notice some fringing and softness at the edges

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its focus can be adjusted with a lever that moves a pair of diopters into position behind the rear element

The Asahi 300mm f4 Takumar is an old-school

Kirk Enterprise Solutions Arca-type plates are very well made in the USA from high quality aluminum

Nikon CS-9 Soft Case Teleconverter but you may notice someThe Nikon CS 9 is a soft case for Nikon FE FM F2 cameras and others of roughly the same size and shape film cameras only, no digital. No real structural reinforcement here, but you do get some light protection from scuffs and bonks. Suitable for slightly longer than average lenses (think 85mm, 35 135mm.) In good cosmetic condition.