Pentax Rear Converter-A 2X-S  type_Adapters but if you're looking for

but if you're looking for a button on a cable that you can press to take a picture

The camera also features a Selenium-cell automatic exposure system

good shutter speeds

and a passthrough column for running cable

and 250mm lenses

Pentax Rear Converter-A 2X-S &nbsptype_Adapters but if you're looking forThe Pentax Rear Converter A 2X S is a 2x teleconverter compatible with most Pentax K mount lenses. Pentax says it's not compatible with its 15mm f3. 5 lenses or the 24 35mm f3. 5 zoom, and there may be a few others out there, too, so check your lens instruction manual to be sure. In excellent condition, with clean glass and only minor cosmetic wear.