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Sony 100-400 GM, is OSS broken?

Zenith

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For static objects. On my adapted Canon 100L I can use shutter speed down to 1/30 with no problem photo being unsharp. On 100-400 GM I always have to use 1/500 even if OSS is activated to get sharp photo. 1/250 will probably give me unsharp photo (on static object). BIF, running dogs I always use 1/2000 to 1/4000 on my A6400 so OSS is probably not that important there. If I think when in old time when I didn't have IS or OSS on my lenses those where the shutter speeds for non-IS lens. (1/500-1/4000)

Please, anyone have an idea if I am thinking correctly, or do I need to do some more test on my GM.

Thanx :)
 

Zenith

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Ok, so here are results of test with Mode1 OSS enabled @400mm handheld at 15 feet (4meters for us metrics). Maybe I was wrong about OSS being "broken"? I see sharpeness till 1/100 sec.

SN202753.jpg
ILCE-6400    Sony FE 100-400mm F4.5-5.6 GM OSS (SEL100400GM)    400mm    f/5.6    1/500s    ISO 400
SN202754.jpg
ILCE-6400    Sony FE 100-400mm F4.5-5.6 GM OSS (SEL100400GM)    400mm    f/5.6    1/250s    ISO 200
SN202755.jpg
ILCE-6400    Sony FE 100-400mm F4.5-5.6 GM OSS (SEL100400GM)    400mm    f/6.3    1/125s    ISO 100
SN202756.jpg
ILCE-6400    Sony FE 100-400mm F4.5-5.6 GM OSS (SEL100400GM)    400mm    f/7.1    1/100s    ISO 100
SN202757.jpg
ILCE-6400    Sony FE 100-400mm F4.5-5.6 GM OSS (SEL100400GM)    400mm    f/10.0    1/50s    ISO 100
SN202758.jpg
ILCE-6400    Sony FE 100-400mm F4.5-5.6 GM OSS (SEL100400GM)    400mm    f/14.0    1/25s    ISO 100
SN202759.jpg
ILCE-6400    Sony FE 100-400mm F4.5-5.6 GM OSS (SEL100400GM)    400mm    f/20.0    1/13s    ISO 100
SN202760.jpg
ILCE-6400    Sony FE 100-400mm F4.5-5.6 GM OSS (SEL100400GM)    400mm    f/25.0    1/6s    ISO 100
 
Last edited:

AlwaysOnAuto

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I wouldn't be complaining if they were my photos. Those look pretty good, especially when you take into consideration it's 400mm on a crop sensor and handheld to boot.
 

WNG

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Bear in mind, you're shooting the 400mm on a crop sensor, so the image is 600mm. The shutter rule is >1/600 sec. with no IS. With ~3 stops of gain with IS, work your shutter speed from 1/600 sec.
 

Zenith

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Bear in mind, you're shooting the 400mm on a crop sensor, so the image is 600mm. The shutter rule is >1/600 sec. with no IS. With ~3 stops of gain with IS, work your shutter speed from 1/600 sec.
Yes, the correct test would be:

1/640 ->1/320 ->1/160 ->1/80 =3 stops
 
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But using a crop sensor just changes the image circle, not the lens focal length, so I'm not sure the old rule applies.
Viewing the cropped image at the same print/screen size would show the motion blur more; the old 1/f rule was used for 135 format photography. That is also suggested from experience that says that you can get away with slower shutter speeds on larger formats, a wisdom I remember from "Low-light and night photography" by Roger Hicks.
 

Zenith

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Have you considered using Auto ISO min SS? I think your 6400 has it. Here is a good description from Mike Smith:
I am using this function since the beggining of using A6400. Thanx for information. If taking pictures in a Zoo or in a park I am mostly at 1/500th since 1/250th got me lot of blurry photos. (atleast for my taste) And my models weren't moving fast.

In this photos I was considering using 1/250th but have a feeling I'd end up with uselless results, so I used 1/500th despite higher ISO.
Maybe I just lost stability in my hands ;)
DSC06201 2.jpg
ILCE-6400    Sony FE 100-400mm F4.5-5.6 GM OSS (SEL100400GM)    400mm    f/5.6    1/500s    ISO 2000
SN102502.jpg
ILCE-6400    Sony FE 100-400mm F4.5-5.6 GM OSS (SEL100400GM)    400mm    f/5.6    1/500s    ISO 2000


I am wondering if A6600 would give me additional stop or two of stabilty because of IBIS + OSS?
 

Petrochemist

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For static objects. On my adapted Canon 100L I can use shutter speed down to 1/30 with no problem photo being unsharp. On 100-400 GM I always have to use 1/500 even if OSS is activated to get sharp photo. 1/250 will probably give me unsharp photo (on static object). BIF, running dogs I always use 1/2000 to 1/4000 on my A6400 so OSS is probably not that important there. If I think when in old time when I didn't have IS or OSS on my lenses those where the shutter speeds for non-IS lens. (1/500-1/4000)

Please, anyone have an idea if I am thinking correctly, or do I need to do some more test on my GM.

Thanx :)
Even without any stabilisation you should be able to get most shots reasonably sharp at 1/125 at the wide end of the zoom. With good technique you should get some reasonably results at the at speed even at the long end (perhaps 1 in 10). Comparing with & without stabilisation should easily show an improvement.

But using a crop sensor just changes the image circle, not the lens focal length, so I'm not sure the old rule applies.
The rule does still work, as long as you use the equivalent focal length. Smaller sensors need more enlargement to display to a given size, so show movements more than just the real focal length suggests.
 

Tipton

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Having used long lenses on both crop sensor and full frame, with and without IBIS, I only count on 2 stops w/only OIS and 4 OIS + IBIS. *Sometimes* you can get more, but not often enough to rely on. Just once have I taken a reasonably sharp image handheld at night for 1 sec, on a night with a full moon. That shot required 5-6 stops of stability, and a lack of coffee in my system. When the camera companies boast about 5+ stops of image stabilization, they're talking about ideal conditions.
 
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