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Originally posted by bdery The T-025X can surely support a 645. The head should, as long as it's not tipped too low I guess. It's rated for a heavier weight than that but I've never tested it with anything worse than a K-3 with 60-250. It worked flawlessly for that.
I replaced the head with a Sirui K10X at Christmas, and even though it's only slightly larger, it's MUCH sturdier. Impressively so.
With tripods, you mostly get what you pay for. I have a 40$ Dolica and even though it works, it's leagues behind the Sirui. The T-025X is the lightest, most compact, and strongest of the travel tripods. and even though it's expensive, it's a bit cheaper than the competition, with a better warranty. There's also an aluminum version if price is an issue.
My experience with the T-025X was that it was a little too light. It could support my K3 and 12-24 OK, but I wouldn't try it with a bigger lens. Also I found that in any wind or trying to stand it in moving water it just wasn't stable enough. I traded up for a Sirui N2204X. It is significantly heavier (about 2X the weight), but still on the lighter side, and critically still fits in a carry on backpack when folded up.
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Sirui N-2204X Carbon Fiber Tripod SUN2204X B&H Photo Video)
Really depends on your priorities. Nothing against the T-025X and I would have liked for it to work for me, but I needed something sturdier. Have been using the N2204X for 2 years now.