Out of boredom this afternoon I decided to clean a bit my lenses. At some point all were lying on a table and theZeiss 100 Makro-Planar was laying besides the Canon 2XIII extender so....thought of matching them. And match they do! Well, kinda because the extender will not let focusing beyong 10m but's that more than enough for macro or portraits (and up to 5m if you put the 1.4x II though I did not bother to take pics with it)
Below a copuple of comparisons of the same pic taken with the Zeiss alone and with the extender. Both pics are taken at minimun focus distance, this means the Zeiss "only" subjct is magnified 1:2 (as per the lens design, obviously) and the extender subject fills 1:1. This is important, the normal zeiss pic is shown zoomed 2:1 to match the extender pic
Pics taken on tripod, aperture priority, liveview mode, cable release. As I had a crappy light in my house I decided to shoot ISO 800 with a Canon 5D III. This proved to be an interesting choice when looking at the effect of noise. I'm no lens test expert so there may be flaws in this test, don't hesitate to pint them out.
(you may want to click to go to the flicker pic at 100% otherwise the differences are lost at this sizes)The Original Field of view for each pic
The "A" in PANAM is about 2mm wide. The coin is a 20 cents of €Original shots II
, sur FlickrTo the left the Zeiss only at 200%, to the right the Extender pic at 100% Zeiss 100MP and 2x comparison f4 (cropped) II
, sur FlickrThe Original Field of view for each pic
(The "I" in Colombia is about 1mm wide)Original shots
, sur FlickrTo the left the Zeiss only at 200%, to the right the Extender pic at 100% Zeiss 100MP and 2x comparison f4 (cropped)
, sur Flickr
My personal conclusion
a) IF your subject does not FILL your frame with teh Zeiss alone, by all means use the Canon Extender!!!! Even for the Zeiss 100MP which is THAT freaking good at any aperture and holds well zooming in however blowing up the Zeiss "only" will cause artifacts and dramatically increase the apparent noise so to me the extender pic gives you more margin to work under those conditions.
b) keeping the Zeiss alone pic at 1:1 and reducing the extender pic to 1:2: the Zeiss alone clearly wins, but your subject does not fill the frame....
c) I'm impressed, did not expect those results.
d) Really happy I got myself a Zeiss 200mm Makro-Planar f/4
A couple of Notes
- When using the extender the camera reads the natural Zeiss aperture range, starting at f/2. In reality you are shooting two stops above it so a extender pic at f/2 = f/4. This is easily seen in the shutter speeds. This also means when shooting at f/22 you get ridiculous small aperture of f/44. Did not bother to try it, probably crappy IQ
-The selections you saw were matched to trying and get the (roughly) same DoF (remember the to calculate double the aperture number in the extender pic to have an idea of the real one)
-have a bunch of other apertures tests in case you're courious!