Tripod question converning teleconvertors and DX/FX
I have a question concerning how you would determine your minimum desired leg diameter in regards to lens length.
I've seen that when someone is using only up to a 70-200mm, a series 2 (28mm) is generally recommended. And it seems that when someone has a 70-300mm, generally as series 3 (32mm) is recommended.
What about an 80-200 AF-S with a 1.4 teleconverter? It's still physically a 200mm lens, but is effectively close to 300mm.
Also, what about DX vs FX? Could the "magnification/crop" of the DX increase the possibility that it might show minute vibrations? How does that work into figuring the desired leg diameter size? Would a 70-300 on a D7000 be calculated the same as a 70-300 on a D600, or would you ideally consider it more like a 450mm on the DX?
To be clear - I am not having any issues with my current tripod, but just have these questions.
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#1. "RE: Tripod question converning teleconvertors and DX/FX" | In response to Reply # 0Chris Platt Nikonian since 30th Sep 2012Sun 10-Mar-13 12:46 PM | edited Sun 10-Mar-13 07:18 PM by Chris Platt
>physically a 200mm lens, but is effectively close to 300mm.
>Also, what about DX vs FX? Could the
>"magnification/crop" of the DX increase the
>possibility that it might show minute vibrations?
>that work into figuring the desired leg diameter size? Would a
>70-300 on a D7000 be calculated the same as a 70-300 on a
>D600, or would you ideally consider it more like a 450mm on
Consider it more like a 450mm
In my opinion, it is easier to think about angle of view rather than focal length. Although the physical focal length doesn't change when you move a lens from FX crop, to DX crop, to 1.3 DX crop, the angle of view does change. It is the angle of view that should be considered in choosing a set of legs. You may be able to get away with a smaller tripod if there is a significant weight difference for the same angle of view. For instance with an 800mm lens mounted on a D800, you'd definitely want a series 5 Gitzo, but with an 80-400 lens mounted on a D7100 in 1.3 crop mode and zoomed to 400mm, you might be able to get away with a series 3. I haven't tested that.
Consideration should also be given to whether or not you will be cropping during post processing. With digital photography, cropping in post processing (or viewing an image at 100%) is extremely common. However, when we do that, we are creating an angle of view much tighter than the stated angle of view for the lens we used to take the shot. If you crop an image taken with a 300mm lens to 50% of the original angle of view, it is equivalent to the angle of view of a 600mm lens - and subject to the same consequences from vibrations. So for my photography, if I know I am going to crop in post, I use the same equipment and techniques that I would use if I had a lens mounted that would create an equivalent angle of view in an uncropped image.
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#2. "RE: Tripod question converning teleconvertors and DX/FX" | In response to Reply # 0jrp Charter MemberMon 11-Mar-13 04:29 AM | edited Fri 15-Mar-13 06:39 PM by jrp
The magnification is more of a factor in tripod selection than the physical focal length of the lens.
In other words, consider the "effective equivalent focal length" or true field of view as Chris has suggested.
When using a Series 3 tripod with an 80-400mm at 400mm I usually got good results (after developing a very good long lens technique).
When adding a 1.4TC the number of keepers went down dramatically.
When working from a DX body it was even more difficult.
Some say all we need to do is to be more careful. Yes, sure, but it is usually hard to recall the bird in the branch for a second try, or the deer or grizzly passing by.
The new 80-400 lens with tripod VR mode would help; however, I am currently saving for a Series 4 or Series 5.
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#3. "RE: Tripod question converning teleconvertors and DX/FX" | In response to Reply # 2J_Harris Nikonian since 29th Mar 2011Fri 15-Mar-13 08:35 PM
Thanks JRP and Chris,
Very useful information that I was not aware of.
Now I must reevaluate my future purchase of the new Nikon AF-S 80-400mm f/4.5-5.6G ED VR lens because I would be using it with my GT3542LS.
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