k-h.a.w wrote: AGeoJO wrote:
A Western grebe family from this morning using stacked TCs. That FE 1.4X TC was mounted on the body, an extension tube on the top of it and the FE 2.0X TC before the GM 600mm lens was mounted. That's the only way the two TCs can be stacked at this point. The effective focal length is 1,680mm and the effective aperture is f/11. Please note that only the 1.4X TC is reported to the camera, hence the exif data is showing only 840mm and f/5.6. The image was cropped a little, yielding an effective FL of approximately 1,800-1900mm or so.
Thanks Joshua. Great technique and terrific image.
Question, how far can this setup focus?
Also, if you use IS, do you manually have to enter the focal length?
TIA. K-H.
Thank you, Karl-Heinz! Approximately, 60feet or so but I am not sure. But a shooting buddy of mine had a Sony GM 400mm f/2.8 and we tried my extension tube plus my 1.4X TC on her setup. But it didn't want to focus, not even manually. So, I am sure it has to do with the FL since that's the only factor that's different between my setup and hers. And yes, I used the IS at Mode II and the AF works fine. And no, the focal length is recorded automatically by the 1.4X TC although the aperture seems to be recorded based on the effective aperture of the 2X TC.
Hope this helps,
Joshua
Jun 08, 2020 at 05:03 PM
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