Inspeqtor wrote in post #18132459
My problem is when I try to manually focus on something like the moon with my Sigma 150-500 lens the picture shakes violently and I am hoping to find a better built tripod that will keep the lens/camera from shaking so badly.
Even with a concrete pillar, your lens will shake violently at 500mm and longer. The lens itself is not a solid piece. Touching it introduces vibration. You will have vibration no matter what due to you manually focusing and touching it. The only way to focus it and not touch it is with electronic control (like BackyardEOS using the micro-focus buttons to advance focus electronically, etc; if shooting Canon). For telescopes, we use much lighter focusing knobs that are aftermarket, but even then, the gentlest touch will shake these things at these long focal lengths.
So what you do is you change focus a little, then stop and let it stabilize and take a look. Use a bahtinov mask on a star to achieve best focus that way, then turn your lens/scope to the moon.
I have a friend online that owns a video tripod with twin legs (with stabilizers between each leg) which he says he can focus his Tamron 150-600 lens with very little shake.
Yea, I can do that too, without a tripod. Image stabilization is a big deal with these lenses for focusing. If your 150-500 has stabilization, turn it on when focusing. Turn it OFF when imaging though. The Tamron's VC is very good and it really makes achieving focus a lot easier since it can help stabilize the shake. I have one too, and the VC really helps to get focus fast. I turn VC off after getting focus when I image though.
It's not due to the tripod.
I have a budget of about $600... what can anyone suggest I look at?
A $20 bahtinov mask and better techniques. Save the rest of your money for something else.
You could spend all your money on a really tight ballhead or gimbal on a really big stable tripod, and you still will get shaky manual focus on a lens that long. Image stabilization helps if available when focusing. But the lens itself is not made of a single piece of material, it will shake, even on a super stable mount. Again, use a Bahtinov mask on a star to get focus initially. Then turn to the moon, or any other object.
Save your budget for something else for AP if that's your goal (like a star watcher adventurer or something).
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Cheap Benro A2970F with a cheap Obteka GH1 Gimbal holding a Tamron 150-600, with 1.4x TC and 2.0x TC with a wee little EOS-M in live view. Used VC on to stabilize. Live View a crater at the terminator at 10x magnification, gentle focus changes with VC on to help keep it stable. 10 second timer.
IMAGE LINK: https://flic.kr/p/ETjrrf
IMG_1990
by
Martin Wise
, on Flickr
From the above, flimsy and inexpensive setup (referring to the mount and camera, etc), 500mm + 2.0x TC + 1.4x TC (1400mm physical focal length) on APS-C:
IMAGE LINK: https://flic.kr/p/FiytRE
IMG_9583
by
Martin Wise
, on Flickr
Very best,