I have both the Pentax 50 mm 2.8 and the 100 mm 2.8 macros. The 50 goes for about $350 and the 100 for about $550, but each goes on sale from time to time for about 15% less.
The 100 is weather resistant and for me gives much superior results, so if the cost of the 100 fits your definition of reasonable, that would be my recommendation. I rarely use the 50 since I got the 100, but it is still a lower cost option.
You could also look for used copies, but the 100 in particular is hard to find used - most owners really like it, I guess. I do.
|