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Message: <blockquote data-quote="Michael Daniel Ho" data-source="post: 1728060" data-attributes="member: 70212">I have put the MK4 under 3 days of rigorous usage and it came out quite well. Can't post any photo till I get home since I have no editing software on my Netbook.Day 1 was in Cabo out in the Sea of Cortez in a zodiac shooting Humpback whales. The weather was fine at first but turned very choppy later. 4-5 foot waves and I was soaked from head to toe. Used the 70-200mm f/2.8 L IS and the combo was completely soaked in salt water. Used the Center Point AI Servo with the 45 point assist and continuous AF tracking priority. Even though I was tossed around the zodiac, the MK4 tracked the whales and kept on firing. Got a Humpback Calf breaching and spyhopping - not an easy shot to get. I was in Cabo last year same time shooting whales and the MK4 seems to have a VERY slight edge with the 45 points assist in heavy seas.Day 2 was in a swampy mangrove marshland on a small boat with an outboard motor outside Acapulco. Weather was vert hot (30 C and almost 100% humidity).  The sighting were not very good and I used the 400mm DO with 1.4X and Center Point plus surrounding AF points and Main Focus point priority. MK4 acted well under heat and sweat.  Day 3 was in San Jose, Mexico in a heavily wooded forest. Sighting were not great , same weather conditions, equipment and setup as Day 2. Really can't stay out too long cos' the heat and humidity take a toll on me.  The MK4 is also turning out to be a decent travel camera as well. Will be in Costa Rica in a couple of days.</blockquote>

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