Reviews and Problems with Pentax SMC DA 300mm f/4 ED [IF] SDM
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8 January 2011
Conclusion: When you consider the price of these lenses vs. build and image quality it is hard to really find fault with either. Both lenses performed extremely well in real world shooting, without any conspicuous flaws, and would be a nice compliment to any camera bag. The only real negative I found was the slightly sub par performance of the DA* 300mm at f/4.