Sunday, August 3, 2008

New Digital Lenses for dSLR

Too much routine lately. Needed something new. Probably new toys would be more interesting. Before getting another dSLR uncle.D had just acquired a new set of Zuiko Digital (ZD) Optics - ZD 14mm~54mm f2.8/3.5 and ZD 70mm-300mm f4.0/5.6 for his dated Olympus E-500 dSLR . The set is capable of zooming optically from 14-300mm [EFL*: 28mm to 600mm on full-frame 35mm SLR]

Friday Night
On the way home, after shopping for groceries at Putrajaya al-Amanda uncle.D stopped over to shoot the following pics using the ZD duo. All pictures are the actual views as they were captured on the CCD. No cropping. No Post Processing - directly from the camera. Only pic resolutions (pixel count) were reduced to 'viewable' sizes for this blog.

ZD 14-54mm f2.8/3.5
The camera was set manually on tripod at f11 2sec ISO200 WB 4800k

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zoomed to 14mm and 25mm

A seasoned 35mm full frame photographer would be expecting fish_eye view for the 14mm lens, actually it is 28mm EFL because the 4-thirds camera system I used has 2x focal length multiplier [or crop factor]. Hence the equivalent focal length , "EFL" is twice. Similarly, most P&S cams has small CCD having crop factor of 7, hence the focal length of say, 5mm could be 35 or 38mm EFL, not a fish_eye!

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zoomed to 54mm

ZD 70-300mm f4.0/5.6
The camera was set manually at f11 2sec ISO200 WB 4800k

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zoomed to 100mm and 200mm

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zoomed to 300mm

Another set of 14mm-300mm zoom, click the thumbnail for larger image...
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To visualise the result of zooming from the widest angle to the longest telephoto of the duo wrt magnification and perspective, I took two sets of quick shots for the illustrations.


Set #1: Magnification
Zooming at a fixed camera-to-object distance won't change perspective, magnification will. Zooming means magnifying the image captured on the CCD/CMOS. Nothing more than that.

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click the thumbnail to enlarge each image


Picture on the LHS was shot at 14mm mark [28mm EFL], while on the RHS was zoomed all the way to 300mm mark [600mm ELF]. All pictures are at their original angle of views as captured on the CCD - no cropping.


Set #2: Perspective
The perspective changes as the camera-to-object distance varies. In the illustration, the camera was set at 1 ft in front of the object at the widest angle of view - next, at the maximum zoom the distance had be increased to approx. 20ft away in order to maintain the same object magnification. It is not the focal length that changes the perspective, the distance is!

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In the evening I set off towards nowhere, kept on cycling leisurely, on the way I spotted the beautiful sunset but I was a little bit too late as I had to take out the old E-500 with the little block buster on it out of my backpack - the Sun was setting down too fast. Anyway here it is...

evening sun
70~300mm f4.0/5.6 @300mm f5.6 1/1000sec ISO200 - VIVID