I thought that might be the case but couldn"t resist the purchase

Thanks for the quick reponse to my question and I have followed the advice and am now sorted.
When I said it was a fairly cheap converter I meant relative to cost , it may be cheaply made as well I dont know.
Its a Tamron 7 element version .

Thanks again.

Fairly new to Digital so please bear with me , I have just purchased a K100D with the Std Kit lens and also managed to aquire a Pentax 50mm 1.7.
Picked up a fairly cheap Tamron 2x converter yesterday (knew it wasn"t a KA type ) but expected some compatability with my camera.
Cant get any comunication when its fitted , just F flashing in the viewfinder .
Is this a setting problem ? and if so can anyone talk me through it or have I made the wrong purchase .

TIA

Julian

30.5mm usually standard filter size on JVC camcorders , so should be readily available.