Mouthcaller is dead on!!!PENTAX DCF SP'S are awsome.if you don't have much to spend I would recomend the, Leupold wind river mesa's for about 200$ they will compete with those that cost hundreds more.

Once again use a tripod!!!

Have fun...... optics are an amazing way to improve a hunt, especially out here in the west where you can spend all day looking through them.