Extra Accessories

	Here are some accessories to make this system more complete. The following items on the left are a circular polarizer and a yellow and red filter, which work great for black-and-white photography.
	I don't know the brand of this set of extension tubes but they are AI compatible, which means turning lens's ring will adjust f-stop for exposure on the camera. With a 50mm lens and all three used one is capable of exceeding the 1:1 ratio.
	This is the Tokina doubler. Note that this, too, is Ai compatible.
	Like with any doubler, you will lost 2 stops, so a 100mm f2.8 will become a 200mm f5.6. I've had pretty good results using this with the 75-150 f3.5 to make it a 150-300 f8 (approx).