Seeking ways of tracking birds in flight with 500mm lens

Started May 23, 2013 | Discussions thread
Barry Pearson
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Re: Barry...
In reply to brandrx, May 24, 2013

brandrx wrote:

Barry Pearson wrote:

I bought a Lensmaster RH2, which doesn't have such vertical adjustment. (I understand the principle of having the axes of rotation through the center of gravity of the lens+camera combination).

Barry,

After looking at the illustrations in the link you have listed, I think I would be tempted to remove that drop-down L plate and make the RH-2 into an RH-1. It appears to me that the axis of rotation would then be through the center for any lens, especially the Sigma 500/4.5 and Pentax DA*300/4. It might be worth a try.

The axis is OK for the Sigma 500mm. It is only the Pentax lenses where the axis is higher than the center of gravity, and it doesn't cause a problem in practice because only more extreme pitches move back towards the horizontal.

The RH2 can't easily (if at all) be used like the RH1 because the Arca clamp is fixed to the drop-down L plate. But it does raise the question about what advantage the RH2 is supposed to have over the RH1? (The RH1 is obviously lighter).

The RH1 costs GBP118 and the RH2 costs GBP148. A typical price for the Wimberly mark II is GBP520. (Ouch!)

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