Asahi Takumar lens hood for 28mm f3.5 (External clamp style) slide projector You can switch it into

You can switch it into a bulb mode

but they mostly manufactured little plastic slide viewers

with the rear-panel frame lineup window

used to shoot tons of classic B&W movies and generally available today only in motion picture reel sizes

and a 7mm tube

Asahi Takumar lens hood for 28mm f3.5 (External clamp style) slide projector You can switch it intoThis is a round metal hood intended for Takumar 28mm f3. 5 lenses with 58mm filter threads, though it clamps to the outside of the lens rather than threading in. A shallow hood, it may be suitable for lenses with similar focal lengths and the same front exterior diameter. While you can expect all the hoods we sell to work properly, we've grouped them into three different condition grades: Working condition hoods will have noticeable paint and finish