Can anyone please help ive only got 3 lenses there all for my camera which is a pentax km?

And I would like to buy 1 more BUT? Which one could anyone suggest ive got a pentax 150-500 lens,

And a pentax 18-55mm,

pentax 50-200mm.

I was thinking of getting a 70-300mm or wide angle lens which would be the best to buy ??

And also can you use any lens like canon or Nikon lens ??????????

Thanks

Hi Shaun. Unfortunately,you can only use Pentax lenses on your camera. You used to be able to get adapters for screw mount lenses at one time,but I dont know if they are still made. There were some  fantastic screw mount lenses made that gave brillient photos.

As for another lens, it depends on what type of photos you want to take. You seem to be fairly well covered with what you have. If you are into real close ups, a 50mm or 90mm close up lens would be handy if a bit expensive. For landscapes an ultra wide angle could be useful but may not be used very often.

I only ever carry  two lenses with me now. An 18 to 70mm and the 70 to 300mm. I have a total of seven lenses but they get so heavy to carry that my two trusty zooms cover me for most of my needs.

Shaun----the lens finder section of Sigma's website might be useful for you making a decision

http://www.sigmaphoto.com/sigma-lens-finder

Thank ever so much for the help I did really need help on this and I think you all have answered my question ill stick what I got and think I will buy the wide lens and give it a g ! 

paul what can say you are the tec the man lol 

stephanie your right i will keep useing the lens i got 

peter  thanks for what you said about the  trusty zooms                                   

SO A  BIG BIG THANKS to

Stephanie

Paul

Peter

thanks again for the help i knew i could count you POE