Tripod/Ballhead Questions with 840mm Effective Focal Length

Started 2 months ago | Questions thread
Bob in Baltimore
Bob in Baltimore Senior Member • Posts: 1,068
Re: Tripod/Ballhead Questions with 840mm Effective Focal Length

S. Miller wrote:


  1. if this is the level of sharpness I should expect from the setup I used (X-T3, XF100-400 w/ 1.4x TC - EFL of 840mm, 10-sec shutter delay, Sirui 2204 and BH-40 head)?

I believe that your EFL is 560 mm, not 840 mm with a 1.4 x Barlow & a 400 mm zoom.

Even so, I would expect better detail than you are showing.

My guess is that you are loosing IQ by shooting your zoom lens at its maximum focal length. Most zooms are not at their best when at max or min focal length. Compromises are necessary & making it great at 400 mm would likely have made it pretty awful at 100 mm. Try backing off to 300 mm focal length and see if you don’t like it better. (I shoot my somewhat antiquated Nikon 70-300 at 220 for best results.)

Teleconverters also compromise image quality. The 1.4x Barlow may be contributing to the problem. If you have the energy, try with & without the TC & at 300 mm & 400 mm.

I think you can save a little bit of time by using a shutter delay of just a few seconds. 10 seconds seems unnecessarily long, tho I must say I have never texted longer than 4 seconds, & your system may be more sensitive than mine.

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Bob in Baltimore

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