You're welcome. More to come...
Here's where I'm confused. The tripod you are considering, the Gitzo 3540XLS costs $750. Yet, you consider a $329 head out of your price range. Putting a lesser quality, inexpensive head on an expensive leg set seems like false economy to me. This doesn't make sense to me. Yes, a rigid set of legs is important, and you've said you want to save weight, but have you considered spending a little less on the legs and a little more on the head to get a better price/performance match between the two? The tripod head you choose will likely have just as much impact on the overall rigidity of your support system than the the tripod legs. And, the head will probably have a MUCH bigger impact on ease of use and the overall enjoyment of using the equipment. If I was in your situation, rather than spend $750 on a tripod and $125 - $200 on a head, I'd consider spending $500 on the legs and $350 on the head. That gets you in the same total price range (less actually), but would seem to give you a better match in terms of quality between the legs and tripod head.
Again, I'm confused by what you said you wanted, and what you are considering buying. In your original post you said your goal was to reduce the weight of what you carry in the field. Yet, according to the specs on the Manfrotto web site the 808RC4 weighs over 3 lbs. (1.39kg) and the 160 nearly 4.5 lbs. (2.00kg). Those are some very heavy heads, especially for someone whose goal is to reduce the weight they are carrying in the field. I have no experience using either of those heads (but I did use a Bogen 3047 for years, replaced it with the ARCA-SWISS B1 due to the intolerable weight of nearly 4.5 lbs.), but one look at the weight specs and I would instantly rule them out for MY use. Again, it seems to be counter productive to spend a fortune on a carbon fiber tripod to save weight and then put a 3 - 4 lb. head on top.
The 410, while not lightweight, actually weighs less (1.22kg = ~2.7 lb.) than the two three-axis heads you mention above. Based on personal experience, if you're max. load is a 4x5 Shen-Hao with a 300mm lens, it will be more than adequate for the task (assuming you are considering an appropriate lightweight 300mm lens, like a 300mm Nikkor M or 300mmm Fujinon C to pair with your Shen-Hao.). It would not be my first choice for weight vs. strength (an ARCA-SWISS or Markins ballhead would), but I would certainly take it over the two heavier three-axis heads you are considering.
Kerry Thalmann
Really Big Cameras
http://www.reallybigcameras.com
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