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Samyang AF 45mm f/1.8 FE Review

Samyang AF 45mm f/1.8 FE - John Riley reviews this new, compact, Samyang AF 45mm f/1.8 FE lens for full-frame Sony mirrorless cameras.

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Samyang Af 45mm F1,8 Fe Front Oblique View

Samyang is now well established in the field of AF lenses, building on the solid base of high-quality manual focus optics. This new lens covers the field of view defined as being closest to the human eye, the standard lens. 45mm may seem slightly wider than usual, but this stems from tradition as so many things in photography do. The standard lens for a format is deemed to be the diagonal measurement of that format, so for the 24x36mm full frame that would be 43mm. In fact, only Pentax have a 43mm lens, but there have been many 45mm offerings and, given that many inscribed focal lengths are approximations anyway, this new lens is close enough to that standard. So we need to look at how the wider standard lens works in practice, as well as the performance of the lens itself. For this review, we couple the lens with the 42MP Sony A7R III full frame body.


Samyang AF 45mm f/1.8 FE Handling and Features

Samyang Af 45mm F1,8 Fe No Hood On Sony A7RIII

First impressions reveal a well made, diminutive lens that weighs in at a very modest 162g, measured without caps or hood. It is not particularly more compact than any other 45mm lens, many of which have a more “pancake” design, but it does look small, feels light and forms an unobtrusive package with the Sony Alpha A7R III body. This combination could work very well for street photography.

From the front of the lens, working backwards towards the camera body, we first find the small, circular bayonet fit lens hood. This has a rather smooth design that actually looks very good on the lens, giving some variation to the otherwise smooth tube that is the lens. The fit is secure and there is no need for any locking catch as it is extremely unlikely that the hood could be accidentally detached. Within the bayonet, the fit is a standard 49mm filter thread.

Immediately behind this is the wide manual focus ring. This has no function in normal AF settings but activates when either the MF option is selected in the camera menu or DMF (Direct Manual Focus) is chosen. DMF means that the manual focus ring is active whilst AF is being employed. The ring is, of course, electronic in operation and as a consequence is utterly smooth in action, with just the right amount of resistance. Focusing is down to 0.45m (1.48 feet), giving a maximum magnification of 0.12x. This is actually what we would expect from a 45mm or 50mm lens and is close, but not any closer than any traditional lens would have been.

There are no other features or controls on the lens, everything being controlled by the camera. The metal mount is well engineered and the lens fits smoothly and firmly onto the camera body. There is no dust and moisture resistance, so some care may need to be taken in wet conditions.

Samyang Af 45mm F1,8 Fe With Hood On Sony A7RIII

Optical construction is 7 elements in 6 groups, including 2 Aspherical and 1 ED (Extra Low Dispersion). The diaphragm has 9 blades, aiming to improve the bokeh, the fine gradation of the out of focus areas in the image. Samyang's UMC coatings are utilised to minimise flare and ghosting.

Samyang makes various claims regarding the optical construction of the lens, citing the fact that design can be very different when there is no space needed for the “flipping mirror” of the DSLR. This would of course equally apply to a Leica and it does tend to result in smaller lenses. The potential for innovative optical design is also there. Another interesting feature of the lens is the concave front element, not unheard of, but certainly relatively rare.

The 45mm focal length may well be a matter of taste for the individual. Focal lengths of between 35mm and 58mm tend to be used as a “standard lens” and 45mm sits comfortably in the centre of that range. It will depend entirely upon the sort of photography an individual does, but as a general purpose standard lens, it works very well.

Samyang Af 45mm F1,8 Fe Rear Oblique View

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Samyang AF 45 mm F1.8 Sony FE Full Format Lens for Mirrorless Sony Alpha System Cameras (FE and E-Bayonet) with Full Format and APS-C Sensor, 49 mm Filter Thread, Small and Premium , 22803
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LenShepherd 13 4.3k United Kingdom
7 Jun 2019 4:40PM
I am intrigued by your summary of "Excellent Sharpness" - have regard to edge performance being a long to long long way behind centre at apertures faster than f8.
Did you mean excellent central sharpness - and good edge sharpness at f8 and smaller apertures?
7 Jun 2019 6:56PM
I mean excellent sharpness virtually throughout the centre of the image and also at some smaller apertures. It's a summary only, but the detail is in the fuller description. On reflection, it might have read more accurately if the wording of the summary was more specific.
9 Jun 2019 1:51PM
Thanks John, I'm definitely going to pick this lens up. Can I ask when distances from the centre are you MTF centre and edge measurements taken at? Thanks
9 Jun 2019 1:52PM
Sorry, "what" are the distances?
9 Jun 2019 5:01PM
I measure at the centre and at various points at the edges. Hope that helps!
e23423 2
9 Jun 2019 9:46PM
Spec page shows data for Chinon 28mm f/2.8 Smile
10 Jun 2019 12:19AM
Thanks for that, I'm sure this will be corrected very soon.
14 Jun 2019 12:57PM
How does it perform in regards to the Samyang 50 1.4 ?
I have it and this makes me want to change Smile
14 Jun 2019 6:25PM
It depends on whether you want a more compact lens with a smaller aperture, or a larger, longer and slightly faster one. Either way, you will get sharp, satisfying images.
21 Jun 2019 11:43AM
Well, bokeh is important. If the one of the f1.4 better ? (At similar aperture of course) ?
21 Jun 2019 1:35PM
The bokeh image set does show the sort of effect that both lenses demonstrate. It is an aesthetic choice, so careful examination of those images might help. I can't be more specific at this point as a fair bit of time has passed and a fair few other lenses have been looked at as well.

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