7Artisans 35mm f/0.95 -- is it really f/0.95? Reliable way to find that out?

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Tim van der Leeuw Contributing Member • Posts: 522
7Artisans 35mm f/0.95 -- is it really f/0.95? Reliable way to find that out?

Hi,

I watched a video on YouTube by Andrew & Deanae where he plays around with a set of 3 cheap manual-focus lenses, including the TTArtisans 50mm f/1.2 and 7Artisans 35mm f/0.95 which of which I own, and he made a comment somewhere near the start that piqued my interest, about measuring the actual light-gathering abilities of these lenses.

Here's the link to the video:

https://www.youtube.com/watch?v=ac3Qv_NHzTA

So I played around a bit with both lenses on my X-H1, setting the camera in spot-metering and setting a fixed ISO and shutterspeed, and checking the under/over exposure indication on the top plate.

I came to the conclusion that for the 7Artisans 35mm f/0.95, the increase in light-gathering when going from f/1.4 to (supposed) f/0.95 is only 1/3 of a stop, not the 1 1/3 of a stop that I was expecting!

More details in a long post which I made in the 3d-party lens forum:

https://www.dpreview.com/forums/thread/4558865#forum-post-64912924

But since this lens has been discussed quite a bit on this forum as well I decided to post a link to that here with my conclusions in short.

Let me know what you think of it, preferably in the other thread on the other forum!

 Tim van der Leeuw's gear list:Tim van der Leeuw's gear list
Canon EOS M5 Fujifilm X-H1 Fujifilm X-T3 Sigma 2x EX DG Tele Converter Canon EF 24-70mm F4L IS USM +12 more
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