Ricoh GR: Lens
Lens Characteristics in Short
The Ricoh GR features a fixed Ricoh GR 18.3mm f/2.8 (28 mm
equiv.) lens (7 elements, 5 groups (2 aspheric elements), 9 diaphragm blades).
The camera offers two crop modes: 35 mm and 47 mm (equivalent), which, of course,
reduce the Megapixel count considerably (10.3 and
5.6 Megapixels). At least, the 35
mm option is useful at times. In addition, a wide conversion lens GW-3 for
21mm (equiv.) is available (requires lens hood and adapter GH-3).
Figures: Ricoh GR in the "on" state - from the front (left)
and from above (right) - you can see how much the lens protrudes in the "on"
Manual distance is set by
pressing the macro/up button and turning the up-down dial, which I find cumbersome.
There are no marks on the lens, but the camera displays distance and
depth of field indicators on the LCD screen.
The lens also does not have a filter thread. The lens hood and adapter GH-3,
which serves for attaching conversion lenses, can also be used for attaching
filters and close-up lenses.
Find more technical information about the lens below.
A Few Technical Data
|| Ricoh GR lens, 18.3mm f/2.8 (corresponds to 28 mm
in 35 mm format)
7 elements, 5 groups (2 aspheric elements), 9 diaphragm blades
|A wide conversion lens GW-3 for 21mm (equiv.) is available (requires
lens hood and adapter GH-3)
||Crops modes (35 mm, 47 mm equiv.); digital zoom: none
||The 35 mm and 47 mm (equivalent) crop modes use less pixels (10.3 and
||Use the filter adapter GH-3 to attach filters and close-up lenses
||From 2.8 to 16 in 1/3 EV increments
|Distance setting range
|| Macro: 10 cm (3.9") to infinity; otherwise from
30 cm (11.76") to infinity
||The camera has a "macro" setting (button)
|Smallest object field
||Approx. 11.2 x 7.5 cm (according to own tests - do not take this too
||Magnification: 0.2 (without close-up lens)
See Lens Reviews below.
On the "Lens
9) of its review
of the Ricoh GR, dpreview.com reports results based on a "classic" DxOMark
test. Here are some findings:
- f/2.8: Center: 2500 lines ; 1/3: above 2000 lines; 2/3: slightly
below 1500 lines; corner: even more below 1500 lines
- f/4 (best result): center: 2700 lines; edges: slightly above 1500
- f/8: center: slightly above 2000 lines; corner: 1500 lines
- fF16: center: 1400 lines, corner: 1100 lines
- Sharpness Sharpness results are hugely impressive. The centre of
the frame is exceptionally sharp at F/2.8, and while the corners don't reach
quite the same giddy heights, they're still very good indeed. There's barely
any improvement on stopping down, with the lens delivering exceptional results
from F/2.8 through to F/8. Diffraction starts to soften things a bit at F/11,
but even F/16 should be perfectly usable when extreme depth of field is required.
- Chromatic Aberration Lateral chromatic aberration is extremely low, and
most unlikely ever to be visible in real-world shooting.
- Vignetting Vignetting is pretty low, at a maximum of ~0.8 stops wide open.
This will rarely be noticeable or need correction in normal use.
- Distortion Distortion is essentially insignificant. ...
it's unlikely ever to anything worth worrying about.
The dpreview.com results suggest not to go beyond f/8 for best image quality,
but even f/16 seems still to be acceptable.
dpreview Studio Shot Comparison Tool - Old Version
Like the Sony RX100 M1, the Ricoh GR was tested with dpreview's old studio shot comparison tool.
The results are meant that you make up your own opinion on the lens...
dpreview Studio Shot Comparison Tool - New Version
The Ricoh GR II, which has the same lens as the GR was already tested with
the new studio shot comparison tool (but there is no longer a "resolution" test):
Again, the results are meant that you make up your own opinion on the lens...
On the first
"performance" page, a summary of the lens's performance is given:
- With a DxOMark score of 21 points, the GR lens is an excellent performer
overall, with low levels of both distortion and vignetting – often
weaknesses in wide-angle lens like this. Sharpness at 13P-Mpix is high too,
considering the maximum is 16P-Mpix, but while still reasonably well-controlled
chromatic-aberration is slightly higher than we would expected for a prime.
Optically then, with no real cons to speak of, this is a very good lens (unless
of course you were looking for the flexibility of a zoom though that would
necessitate a very much larger lens design).
On the "measurements" page,
I find the "DxOMark score map" and the "Sharpness field map" most
instructive. On the latter, you can vary aperture (f-number) and focal length.
There you can investigate how diffraction sets in at larger f-numbers and also
where the lens performs best (between f/2.8 and f/8, in my
The DxOMark results also suggest not to go beyond f/8 or f/11 for best image
BTW: It took me some practice to use these pages and to find what I wanted...
Some Quotations Regarding the Lens (From Reviews)
GR review at Imaging Resource:
- Overall: Sharpness and contrast are very good at f/8 across the
frame, and chromatic aberration is quite low.
Performance in the corners looks to be very good, with just a hint coma distortion.
There is some corner shading ("vignetting"),
but it's fairly minor.
- Geometric Distortion:
Very low geometric distortion. Barrel distortion is ~0.1 percent.
The Ricoh GR's
lens produces only about 0.1 percent of complex (wavy) barrel distortion,
which is very low, especially for a wide-angle lens. Uncorrected RAW files
exhibit the same low distortion, which is a pleasant surprise.
- Chromatic Aberration and Corner Sharpness:
Very low levels of C.A. (and the camera suppresses what little there is).
The lens produces slightly soft corners when wide open, but corner performance
is excellent when stopped-down.
- Lens Corrections: The only lens correction the Ricoh GR seems to
apply is chromatic aberration suppression, as geometric distortion and corner
shading appear to be the same in uncorrected RAW files.
Test: Ricoh GR APS-C Compact (Philip J. Ryan):
- In our resolution tests, the GR showed a respectable result with 2425 lines
per picture height at ISO 100, for an Extremely High rating. Much of this
was retained at ISO 1600, where the camera captured 2375 lines. ISO 6400
brought a drop to 2290 lines - still within our Extemely High ratings band.
At the camera's top sensitivity of ISO 25,600, it turned in 2150 lines,
which makes for a Very High rating on our scale.
RX100 Review (Angela Nicholson, TechRadar):
Image quality and resolution:
- As part of our image quality testing for the Ricoh GR, we've shot our resolution
chart. If you view our crops of the resolution chart's central section at
100% (or Actual Pixels) you will see that, for example, at ISO 100 the Ricoh
GR is capable of resolving up to around 24 (line widths per picture height
x100) in its highest quality JPEG files.
GR review part II (Harold Glit):
- One thing that really shines on the GR is the lens. It is very sharp at
full aperture and the corners are already very good at F/2.8. Maybe even
more impressive is how well the GR maintains its sharpness over the aperture
GR camera review (Oleg Novikov):
- Sharpness is simply exemplary. The centre of the frame is perfectly sharp
starting right from f/2.8. The corners show a bit of softness wide open, but
you would not find problems with it unless you are making comparisons with
performance at an optimum aperture. Sharpness improves slightly at f/4 and
peaks around f/5.6. Diffraction starts to take its tall at f/11, but this aperture
is still perfectly usable if you need greater depth of field. At f/16 things
get discernibly soft because of diffraction, and I would not use this aperture
unless I really have to for the reasons of depth of field.
- ..., vignetting is very mild (under one stop) and would not
be noticeable in real–life images, even those including vast expanses
- If you look very closely at 100% magnification, you may see some occasional
hints of chromatic aberration. They are so negligible, however, that you
really have to look for them; they would not impact quality of prints even
if not removed in post processing, which is easy to do.
- The lens produces distortion with a somewhat complex ("moustache")
signature, but its degree is so insignificant that you really have to go
out of your way to make it noticeable.
- Lens flare is very well controlled: while it is possible to induce some
minor loss of contrast and occasional ghosting, shooting into bright sources
of light is generally not problematic.
- Bokeh is a very subjective performance criterion, ... . Bokeh
produced by the lens of the Ricoh GR ...
is plain gorgeous.
The following online reviews of the Ricoh GR typically include a review of
the lens, albeit not as thorough as the reviews from DxOMark and dpreview.com.