06-07-2022, 10:59 AM
(This post was last modified: 06-07-2022, 12:11 PM by stoppingdown.)
First round of tests done. Procedure: exposure: using zebra; drive mode: single shot, roughly one shot per second; ten shots per each set; pre-focused only once at the beginning.
Subject at roughly 5 m (IS0 100 fixed, changing aperture from ƒ/2.8-9-18 since it's in the shadow), percentages of sharp shots:
1/800: 100%/100% (IBIS on/off)
1/80: 80%/40%
1/20: 70%/0%
Subject at roughly 1000 m (ISO 100 and 50, changing aperture from ƒ/4-11-22 since it's in the sunlight):
1/1250: 100%/100% (IBIS on/off)
1/80: 70%/50%
1/20: 40%/20%
Of course in evaluating sharpness I focused on motion blur, since absolute sharpness varied because of diffraction when stopping down a lot. I'll try to redo the test in more homogeneous conditions, but I think it's enough to prove my IBIS isn't broken. At this point it probably makes sense to refine the test to have a rough estimate of the actual stops gained.
Subject at roughly 5 m (IS0 100 fixed, changing aperture from ƒ/2.8-9-18 since it's in the shadow), percentages of sharp shots:
1/800: 100%/100% (IBIS on/off)
1/80: 80%/40%
1/20: 70%/0%
Subject at roughly 1000 m (ISO 100 and 50, changing aperture from ƒ/4-11-22 since it's in the sunlight):
1/1250: 100%/100% (IBIS on/off)
1/80: 70%/50%
1/20: 40%/20%
Of course in evaluating sharpness I focused on motion blur, since absolute sharpness varied because of diffraction when stopping down a lot. I'll try to redo the test in more homogeneous conditions, but I think it's enough to prove my IBIS isn't broken. At this point it probably makes sense to refine the test to have a rough estimate of the actual stops gained.
stoppingdown.net
Sony a6300, Sony a6000, Sony NEX-6, Sony E 10-18mm F4 OSS, Sony Zeiss Vario-Tessar T* E 16-70mm F4 ZA OSS, Sony FE 70-200mm F4 G OSS, Sigma 150-600mm Æ’/5-6.3 DG OS HSM Contemporary, Samyang 12mm Æ’/2, Sigma 30mm F2.8 DN | A, Meyer Gorlitz Trioplan 100mm Æ’/2.8, Samyang 8mm Æ’/3.5 fish-eye II | Zenit Helios 44-2 58mm Æ’/2
Plus some legacy Nikkor lenses.
Sony a6300, Sony a6000, Sony NEX-6, Sony E 10-18mm F4 OSS, Sony Zeiss Vario-Tessar T* E 16-70mm F4 ZA OSS, Sony FE 70-200mm F4 G OSS, Sigma 150-600mm Æ’/5-6.3 DG OS HSM Contemporary, Samyang 12mm Æ’/2, Sigma 30mm F2.8 DN | A, Meyer Gorlitz Trioplan 100mm Æ’/2.8, Samyang 8mm Æ’/3.5 fish-eye II | Zenit Helios 44-2 58mm Æ’/2
Plus some legacy Nikkor lenses.