Focal Length and Perspective

Q. Will lenses of different focal lengths produce different perspective?
The answer is NO and yes. "NO" if u keep object to camera distance unchanged. Of course the angle of view widens as u change focal lengths or when u zoom-in. The perspective remains the same though.It's the object to camera distance that changes perspective. Not the focal length.

The perspective will change only if u r trying to keep the main object image size [in the foreground] the same by changing object to camera distance as u change lens focal length - i.e by moving closer to the object for shorter focal length and step backwards from the object for longer focal length - in this case the perspective changes.



Hands-on lensTalks

Prime Legacy Manual Lenses - all metal all glass

ZD autoFocus Lenses

Welcome again to abhabPHOTOtalk

My apology for closing down this blog for more than one year. Phototalks now reopens. "Let's talk..."

I was actually preoccupied with some other activities that I forgot NATUREphotography and PHOTOtalks - besides that  my old faithful dSLR dropped off while cycling at Morib breaking one of my favourite lenses. The camera itself wasn't function properly too after the incident.

I'd sold  ZD 7o-3oomm f4 & ZD 14-52mm f2.8 lenses while they were still 'hot' amongst 4-thirds system enthusiasts and then I bought a Panasonic LX3  compact digital camera [with Leica lens of 24mm efl/f2.o].

After one year using "point and shoot" digital camera I'd thought of buying another dSLR. Life as a NATUREphotographer must go on. At one weekend night, I decided to open up the old dSLR to find out if there were some repairable mechanical failures and I didn't mind to be like 'tikus baiki labu' because I'd decided to go ahead with the new dSLR purchase. Nothing to loose. To my surprise there was only a loose connector on flexi-PCB inside the camera body - probably due to very high g-force when it fell off.

Legaaa!!! the old faithful Olympus E-5oo came to life and ready for action for the first time after hibernating for more than one year. Here are some shots...

08-91310077
Zuiko Digital 35mm f3.5 macro @ f8 1/60sec ISO100 using built-in flash

Feb01A1010116
Tokina RMC 200mm f3.5 @ f11 1/250sec ISO400


How resolutions effect magnification

Q. What is the significance of higher resolution CCDs?
Apart from greater detail, larger resolution CCDs produce bigger image, but don't get confused by the magnification on frame and viewfinder which depends on lens - not CCD.

For illustration I shot the moon at 8MP and 2MP settings respectively using the same camera. The native resolutions were maintained [i.e no size reduction] but cropped 100% to 500 x 282pixel.

Q. What is 100% crop?
100% crop means that your are seeing the image 1:1, i.e you're seeing it at the pixel level, each pixel on your screen is a pixel of the image captured on the CCD. I've blown it up to 100% then cropped it - since the WHOLE image of 8MP or even 2MP would be HUGE to display on this screen without cropping or trimming.

Here are the results for comparison:
05A1040197
8MP [3264 x 2448pixel] cropped 100%

05A1040190
2MP [1600x1200pixel] cropped 100%

EXIF
Original date/time: 2010:02:04 06:07:20
Exposure time: 1/180
F-stop: 11
ISO speed: 200
Focal length: Tokina RMC 200mm f3.5 s/n 7701252
Flash: -
Exposure mode: Manual
White balance: Auto
Orientation: Top-left
Light source: Unknown
Exposure bias: 0.0000
Metering mode: Pattern
Exposure program: Manual
Digitized date/time: 2010:02:04 06:07:20
Modified date/time: 2010:02:04 06:07:20
Image description: OLYMPUS DIGITAL CAMERA

Click on any of the following highlighted photo categories to proceed.
Categories
ARACHNOgraphy - spiders
ENTOMOgraphy - insects
FLORAgraphy - flowers
LEPIDOgraphy - butterflies and moths
MAMMALgraphy - four-legged animals
ORNITHOgraphy - birds
REPTOgraphy - reptilia
WONDERcolors - natural spectrum of colours

Uncategorised photos
ANYphoto - general uncategorised photos
CLOSEUPhotography - general close-up photos [non-macro]
TALKphotography - readers can find FAQ, post questions and comments here
WONDERcolors - striking color photos
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