Introduction
After the Sony FE 40mm 2.5 G and the TTArtisan 40mm 2.0 AF we now have a third compact 40mm lens with AF: the 7Artisans 40mm 2.5 AF. Let’s find out in this review how it compares to its competitors.
Sample Images
Most of the sample images in this review can be found in full resolution here.
Contents
Specifications
The 7Artisans 40mm 2.5 AF has the following specifications:
- Diameter: 63 mm
- Length: 37 mm
- Weight: 88g (without hood[8g], without caps)
- Field of view: 56.1° (diagonally)
- Filter Diameter: 46 mm
- Number of Aperture Blades: 9 (rounded)
- Elements/Groups: 7/6
- Close Focusing Distance: 0.4 m
- Maximum Magnification: 1:7.8 (measured)
- Mount: Sony E, Nikon Z, L-mount
buy from 7Artisans Shop | Pergear | Amazon.com | Amazon.de | ebay.com | ebay.de | B&H (advertisement/affiliate links) for $159
Disclosure
Pergear sent me a sample of this lens for reviewing purposes. Thanks a lot!
Handling / Build Quality
Despite its low price this 7Artisans 40mm 2.5 AF comes with the full set of controls: AF/MF switch, aperture ring and lens button. Apparently there was no space for something structured close to the bayonet for easy mounting and unmounting the lens though.
The outer casing seems be made mostly from polycarbonate, the bayonet part is made from metal.
The focus ring actually has a very nice and even resistance and it alsways takes 180° from the minimum focus distance of 0.40 m to infinity. The manual focus experience surely leaves something to be desired though: the focus motor has noticeable steps and for setting exact focus some more (and smaller) steps would have been appreciated.
The aperture ring has a third-of-a-stop click-stops and cannot be declicked.
The AF/MF switch is also a bit of an oddity: on all other lenses I have used so far that have a vertically oriented AF/MF switch, the top setting is “AF” and the lower setting is “MF”. Here it is the other way round.
At the bottom you can find a USB-C socket for potential firmware updates.
The 7Artisans 40mm 2.5 AF ships with a square hood and here square literally means square, not rectangular.
This 7Artisans 40mm 2.5 AF is a very small lens and one of the smallest AF lenses for the E-mount systen. It is noticeably smaller and lighter than the Sony FE 40mm 2.5 G and only have the weight of the TTArtisan 40mm 2.0 AF.
On my Nikon Zf the lens worked very well with the megadap ETZ21pro+ adapter and with slightly slower autofocus also via the Viltrox E-Z adapter. In both cases the lens is being recognized as 40mm f/2.7 though. On the Neewer ETZ adapter it neither focused nor was it possible to change the aperture.
Autofocus
I am not shooting sports or fast moving animals/humans so if you want to know if the lens is fast enough for this, or how it compares to other lenses in this segment, you may have to look for a different review with a more detailed assessment of this aspect.
The AF is not super fast and a little bit noisy. For not very demanding applications it worked perfectly fine though.
Vignetting
| f/2.5 | 2.8 EV |
|---|---|
| f/4.0 | 2.0 EV |
| f/5.6 | 1.5 EV |
| f/8.0 - f/16 | 1.3 EV |
After seeing the tiny front element you might already be afraid where this is going, but the vignetting figures are not overly high compared to similar lenses. The Sony FE 40mm 2.5 G shows 0.3 to 0.5 EV less vignetting at shared stops, the TTArtisan 40mm 2.0 AF shows similar vignetting values in the f/2.8 to f/4.0 range, but more when stopped down further.
It is recommended to have a look at this article first to get an idea how this brightness graph works.
Sharpness
Infinity (42mp Sony A7rII)
At f/2.5 we see a solid across frame performance, but the image is a bit softer due to spherical aberration.
On stopping down to f/4.0 we see something odd here. This lens – similar to some other compact lenses like the Artizlab 35mm 1.4 Classic or the Light Lens Lab 35mm 2.0 8e – shows an interesting combination of focus shift and field curvature. When taking a first series without adjusting the focus, I noticed there is hardly an improvement in the center of the frame visible (common for lenses with focus shift). When adjusting the focus for optimal performance in the center at working aperture at f/4.0, you can increase the center performance noticeably (as can be seen in the graph above), but at the cost of the performance in the midframe and corner regions (field curvature).
By cleverly adjusting the focus setting you can already get very good across frame performance at f/5.6. If the light levels allow stopping down to f/8.0 or better f/11 you can also do that and not worry about any of this.
The Sony FE 40mm 2.5 G shows an impeccable performance from f/2.5 across the whole frame. The TTArtisan 40mm 2.0 AF does need stopping down to f/11 for the corners to actually look good.
Portrait 1.2 m (42mp Sony A7rII)
For portraiture it isn’t so important how flat the field is, it is more interesting to see what the sharpness is like when focused at different parts of the frame to take field curvature out of the equation.
We will be looking at 100% crops from the 42mp Sony A7rII.
f/2.5 <—> f/4.0
At portrait distances we see a good performance at f/2.5 and a very good performance from f/4.0.
The TTArtisan 40mm 2.0 AF performs similar in the center and inner midframe but looks worse in the outer midframe area. Again the Sony FE 40mm 2.5 G shows higher contrast and resolution at f/2.5, more than this 7Artisans lens stopped down.
Close 0.4 m, 1:7.8 (42mp Sony A7rII)
This 7Artisans 40mm 2.5 AF shows a good performance at close distances from f/2.5 – much better than the TTArtisan 40mm 2.0 AF which comes with the same minimum focus distances.
The Sony FE 40mm 2.5 G focuses noticeably closer (offering a maximum magnification twice as high) and despite that looks least as good at shared apertures.
Flare resistance
Sadly, this is the section where we most often encounter problems with the affordable lenses from China – with some of Viltrox’ lenses like the Viltrox AF 14mm 4.0 FE being a rare exception.
Will this 7Artisans lens with its small front element also be a positive surprise?
At the maximum aperture we see all kind of artefacts: internal reflections, ring flares and huge ghosts. Also a strong light source outside the frame can lead to severe artefacts – despite using the hood.
Stopped down the situation is better, as internal reflections are not really a problem anymore. The same cannot be said about all of those ghosts though.
Here actually the TTArtisan 40mm 2.0 AF showed a solid performance in our tests and also the Sony FE 40mm 2.5 G – while not being one of Sony’s best lenses in this category – had way less issues.
Coma
100% crops from extreme corner, focused on center, Sony A7rII
We see some Coma at f/2.5, but already stopped down to f/4.0 it is mostly gone. The TTArtisan 40mm 2.0 AF showed bigger artefacts at f/2.5, the Sony FE 40mm 2.5 G actually showed a similar performance with only minor artefacts (and less soft corners).
Distortion
The 7Artisans 40mm 2.5 AF shows a low amount of pincushion distortion. You can dial in -4 in CameraRaw to correct this.
Bokeh
In terms of shallow depth of field a 40mm 2.5 lens will not break any records here, but let’s still have a look at the quality of the bokeh, especially as the Sony FE 40mm 2.5 G was a bit on the harsh side.
Close Distance
For close up photography the maximum magnification of 1:7.8 can be a bit limiting (especially compared to the much closer focusing Sony FE 40mm 2.5 G). The bokeh does look pretty nice at these distances though.
Mid Distance
Also at mid distances the bokeh looks unobtrusive and smoother than what I have seen from the Sony FE 40mm 2.5 G. The TTArtisan 40mm 2.0 AF seems to sit inbetween: not as harsh as the Sony, not as smooth as this 7Artisans. The TTArtisan does have the advantage of being slightly faster though.
Long Distance
At longer focus distances – thanks to the moderate specifications – there will only be a limited amount of background blur. I also didn’t encounter any issues caused by field curvature here, which we have seen from many other compact lenses.
Above you can see a comparison to a much faster lens, the Viltrox AF 35mm 1.2 FE LAB. This obviously isn’t a fair comparison, considering the Viltrox lens is significantly bigger and more expensive.
Sunstars
As is often the case with lenses featuring 9 aperture blades, the sunstars are not very well defined. For blue hour scenes they do look ok though and are almost symmetrical from f/11 to f/16.
If you want to know more about sunstar rendering of different lenses have a look at this article.
Chromatic aberration
Lateral
Similar to many other recent E-mount lenses also this 7Artisans 40mm 2.5 AF features a built-in lens correction profile for lateral CA that will be recognized in most raw converters, so you won’t be seeing any in your pictures.
Longitudinal
We can see some minor bokeh fringing, similar to the TTArtisan 40mm 2.0 AF. The interesting thing here is, that the Sony FE 40mm 2.5 G actually performed noticeably worse than its cheaper competitors.
Purple fringing is surely noticeable at f/2.5, stopped down to f/4.0 most of it is gone already. The TTArtisan 40mm 2.0 AF and the Sony FE 40mm 2.5 G showed a similar performance.
Conclusion
good
|
average
|
not good
|
It seems that now all the Chinese manufacturers offering affordable AF lenses have a 40mm f/2.0 or f/2.5 lens in their portfolio, giving us a lot of choice, so who is this 7Artisans lens for?
I always considered Sony’s FE 40mm 2.5 G to be a bit on the expensive side for what it is. Compared to Sony’s own cheaper lenses, the additional controls were a good sales argument, but the Chinese manufacturers now match those at significantly lower price points.
This 7Artisans 40mm 2.5 AF is a solid, compact and affordable prime lens. As is often the case for these lenses, flare resistance can be a problem. There is a bit of field curvature, but stopped down to f/8.0 or f/11 it also works very well for demanding landscape or architecture subjects.
If you are looking for a small and affordable 40mm prime – maybe to complement your slow super zoom – this lens might be what you are looking for, but also have look at the alternatives below to find out which of these (sometimes very similar) lenses could work best for you.
buy from 7Artisans Shop | Pergear | Amazon.com | Amazon.de | ebay.com | ebay.de | B&H (advertisement/affiliate links) for $159
Alternatives
E-mount
Sony FE 40mm 2.5 G:
Compared to all the alternatives listed here the Sony lens is very expensive. It has the highest contrast and resolution of all these lenses but also creates harsher bokeh and shows stronger bokeh fringing. If your biggest concerns are resolution and contrast and not so much bokeh and price this might be your lens.
buy from Amazon.com | Amazon.de | ebay.com | ebay.de | B&H (advertisement/affiliate links) for $548
Viltrox AF 40mm 2.5:
The Viltrox 40mm 2.5 seems to be the optically worst among these compact 40mm AF lenses and also comes without any controls. I would rather be getting one of the alternatives.
buy from Viltrox Shop | Amazon.com | Amazon.de | ebay.com | ebay.de | B&H (advertisement/affiliate links) for $158
TTArtisan 40mm 2.0 AF:
While still a small lens, the TTArtisan is noticeably bigger but also a little bit faster. In many of the categories these lenses perform similar, the main difference I see is this 7Artisans’ slightly nicer bokeh.
buy from TTArtisan Shop | Amazon.com | Amazon.de | ebay.com | ebay.de | B&H (advertisement/affiliate links) for $168
You can find many more alternatives in our Sony FE Guide.
Z-mount
Nikon Z 40mm 2.0:
The Nikon lens is almost the same size as the aforementioned TTArtisan and therefore bigger than the lens being reviewed here. The Nikon’s optical performance is similar, it does not come with any controls and for cost cutting measures doesn’t even have a metal mount. The Nikon Z 40mm 2.0 is only a little cheaper than the Chinese offerings, so I am not sure how appealing those are to Nikon users.
buy from Amazon.com | Amazon.de | ebay.com | ebay.de | B&H (advertisement/affiliate links) for $197
Sample Images
Most of the sample images in this review can be found in full resolution here.
Further Reading
- All Lens Reviews
- Lens Aberrations explained
- Review: Viltrox AF 14mm 4.0 FE Air
- Review: Sigma 40mm 1.4 Art
- Review: Voigtländer VM 40mm 1.4 Nokton MC
- Review: Viltrox AF 85mm 2.0 FE EVO
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