I'm using a Sony a6400. Often I see these 2 lens almost at same price.since my body has no IBIS, wanna know how much does the OSS help compare to sigma f1.4

Tdlr
OSS vs 0.7 stop gain going from 1.8 to 1.4 sigma which better.

1.4 ftw.


depend on location and setting;
extra bokeh
can use low iso
can use high shutter speed

only go with oss if you use video more than photo.

I second this suggestion. For video, the OSS really noticeably helps the footage. Otherwise, 1.4 would give more bokeh. I had this same dilemma and choose OSS due to my video biased usage.

TL;DR - YES: it helps your shaky hands

It helps in hand held scenarios when shooting near or below the minimum shutter speeds (based on the reciprocal rule 1/effective focal length shutter speed). AND so does putting your camera on a tripod/any stable surface (it removes shakes by forcing you to remove your shaky hands from the camera)

TL;DR - NO, it does allow you to get longer exposure but if your subject moves during the 'longer' exposure, GG.

You can use longer exposures now that its stabilized, but they don't do any good if your subject moves/is fast moving; your background will be well exposed but your subject will be a blurry mess.

I think its only half to two thirds a stop diff, probably not drastically different aperture wise (a reminder that while larger apertures let in more light, it doesn't guarantee more light reaching the sensor, different (same focal length) lenses although have equal aperture (f/stops) may not have same transmission of light (T/stops). many factors involved with this mainly the construction of the lenses; materials, no of elements etc. Cant say for sure needs to be tested side by side to see if the difference is noticeable or significant.

Better look at other stuff rather than these two OSS and aperture; built quality handling, sharpness etc etc. Its the same price like you say, so pick the one that suits YOU, not the one rando people on internet forum say its the BEST, because everyone is different and has different needs and expectations that is BEST served by different equipment.

eg. want bokeh, then the 1.4 then would produce more etc etc

PS: we have no idea which sony 1.8 lens and sigma 1.4 lens you are referring to (sony and sigma makes many 1.8 and 1.4 lenses)

This post has been edited by lonewalker: Oct 19 2021, 01:33 AM

Thanks for the detail review. Yes now that mention, different lense dosent mean guaranteed more lights. That's one.

Sigma 30mm f1.4 vs Sony f1.8 OSS, referring to emount lenses. Due to the focal length differences (5mm) the 1.8 might gives equivalent bokeh of f1.4 sigma.


You are right, have to see what's my needs are. I think I will go for sony f1.8 OSS.
1. OSS (I'm a beginner, mostly handled)
2. 35mm (closer to full frame 50mm)
3. Almost equivalent bokeh due to 5mm more focal length (probably negligible)
4. Sony native auto focus ( I think Sony native lense has better AF, which I'm heavily reliant on)
5. Small size (not using for studio use, casual and travel will be easier)
6. Filter size 49mm( I have other 49mm filters, will save some from there)

i would suggest with OSS .. easily beat the 0.7 stop gains from the faster lens
and like what you have said, the bokeh is pretty much negligible unless the sigma has better min focus dist, then it will be another story.

but not sure the OSS optical quality tho.