Carl Zeiss Sonnar T* 2.8/135 C/Y
Sharpness and Contrast
Based on photos I have taken I have no reason to doubt that the measured MTF charts would
not be as Zeiss has them measured.
According to Zeiss (underline parts different than in Canon's MTFs): "The Modulation
Transfer (MTF) as a function of image height (u) and slit orientation (sagittal, tangential)
has been measured with white light at spatial frequencies of R = 10, 20 and 40
Wide open - subjective
Closed down - subjective
highlight shapes - in corners "cateye" or not
highlight shapes - is the highlight circle having strong edges or soft edges
Nightphotos on city => strong lights
Vignetting and distortion
Handling and usage
Focusing from infinity to 1.6 meter is about XXX degrees rotation.
XXX subjective description of manual focus resistance XXX.
XXX Manual focusing is very accurate and it's very easy to achieve accurate focus with live view.
Aperture can be selected 1 stop intervals. When using viewfinder and manually stopping
down it's easy to calculate "clicks" from wide open to determinen the aperture into
which lens is stopped down.
XXX subjective feeling of aperture adjustment if any XXX
XXX subjective description of focus ring width and usage with gloves if relevant XXX
XXX subjective description of lens hood if applicable - physical and flare protection XXX
XXX subjective description of lens cap when lens hood is used XXX
XXX Polarized usage with hood if applicable XXX
XXX Lens hood effectiveness with filters XXX
Build quality and basics
Build quality is as good as I could imagine, from different planet than Canon lenses.
Lens dimensions with C/Y to EOS adapter and lens caps are:
diameter 68.5mm, length 93+XXXmm, weight 585+XXXg.
This lens isn't internal focusing and therefore extends when focused closer. Lens extends
about XXXmm when focused to minimum focus distance 1.6m. Lens uses filter size of 55mm like
most of "slow" Contax lenses.
Minimum aperture is f/22.
Aperture has XXX blades and aperture remains XXX very round even at f/22 XXX. Lens has 5
elements which are in 4 groups. Actual focal length is 134.1mm. Minimum focus distance
is 1.6m, which results 0.08x magnification and full frame (36mm x 24mm) coverage
of 430mm x 286mm. Magnification is calculated based on focal length and minimum
in my picturebank taken with this lens.
digLloyd Zeiss ZF lenses
Zeiss.com - Carl Zeiss Distagon T* 35mm f/2.0
Zeiss.com - Carl Zeiss Makro-Planar T* 100mm f/2.0
16-9.net - Test of 28mm lenses including CZ 28/2.8
Pebble Place - Carl Zeiss Planar T* 2/100
Pebble Place - Carl Zeiss Macro-Sonnar T* 2.8/100 N
SLR Lens Review - Contax Sonnar T* 2.8/135mm C/Y
SLR Lens Review - Contax Sonnar T* 2.8/85mm C/Y
SLR Lens Review - Contax Planar T* 1.7/50mm C/Y
Pebble Place - Contax Sonnar T* 2.8/135mm C/Y
Some example pictures of Zeiss lenses
pinciuc.com - samples from various lenses
Pictures of Carl Zeiss Sonnar T* 2.8/100 C/Y
Lens extends when focused
Distance from EOS lens mount (including adapter) to end of the hood is XXXmm at infinity
and XXXmm at minimum focusing distance.
Made in Germany.