Lens Used
What is this type camera lens used for?
I was given a camera that has a "70-300mm 1:4-5.6 macro" lens. I am trying to determine what this lens is best used for. What are it's characteristics?
That is a very versatile lens. It can zoom from just a little above the "normal" 50mm length to a really tight telephoto that makes it look like you are much closer to the subject than you really are, And the marco part means you can get close to things and get a lot of detail. This is a good all-purpose lens for anything except panoramic landscapes. Enjoy!
 Nikon AF S DX Zoom NIKKOR 18 55mm f 35 56G ED II Lens Used US $88.00 
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 USED COSMICAR TV ZOOM LENS 125 75mm 118 W CABLE NO RESERVE PARTS OR FIX ONLY US $10.50
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 Auto Vivitar Telephoto 135mm f28 used Screw mount lens US $25.00
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 Canon Lens FD 28mm F 20 used US $59.99
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 Canon Extender EF 14x II Lens Used US $191.31
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 Nikon AF Nikkor 35 80mm 14 56D Lens used US $70.00
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 Canon 28 mm 90 mm F 40 56 Lens NEVER USED REF US $69.00
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 9 Pentax interchangeable camera lenscases caps and manual good used US $69.99
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 Tamron AF Di ll LD Macro 55 200 mm F 40 56 Lens For Canon used twice hood US $75.27
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 Canon EF 28 135mm f 35 56 IS Lens Used AS IS sticky telephoto US $91.00
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 CANON EF 75 300mm f4 56 IS USM LENS EOS 5 60D XSi USED US $299.99
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 SIGMA 300mm f28 EX APO LENS FOR CANON EOS 60D 1DS 7D 5D USED US $1,199.99
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 SONY 70 300mm f45 56 G SSM LENS ALPHA A300 A700 USED US $551.00
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 CANON EF 70 200mm f4L USM LENS 60D 1D XSi T2i USED US $499.99
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 SONY DT 16 105mm f35 56 LENS FOR ALPHA A100 A700 USED US $345.00
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 CANON FD 28mm f28 LENS AE F 1 T70 T90 USED US $39.99
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 CANON EF 75 300mm f4 56 III LENS EOS 60D Xsi USED $1 US $127.50
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 Used Sigma DG Macro AF MF Zoom Lens 28 300mm F35 63 Fits Canon AF US $49.00
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 Nikon Micro Nikkor Auto 135 55mm Non AI Lens Use on your SLR or DSLR US $2.36
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 Very Nice Used Ozunon 75 200mm 145 Telephoto Lens US $7.95
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 Canon EF S 55 250 mm F 4 56 IS Lens NEW IN BOX Brand New Never Used US $170.00
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 Nikon Nikkor 85 mm f 18 AF D Lens Used Excellent Condition US $319.00
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 Used Sigma 24 70 mm F 28 Lens For Canon US $415.00
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 Vivitar Auto Telephoto 300MM Camera Lens Used US $19.95
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 Carl Zeiss C Biogon T 28 35 ZM 35mm f 28 Black Lens USED US $500.00
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THE PROS AND CONS OF USING A FOUR COLOR PROCESS
There are so many articles written about the four color process
but the question on its usefulness still requires further
explanation. There are actually three primary colors of light
that the human eyes perceive and these are red, blue and green.
So why create a four color scheme? Although the three colors can
already come up with various color mixes but the problem with
the combined colors is that it is never great when it comes to
printing on papers. And so technology calls for the creation of
colors that can solve the problem of printing on papers thus the
creation of CMYK which stands for cyan, magenta, yellow and
black.
The combination of any of the four colors would result to the
three colors of red, blue and green. Just how is this achieved?
Well, in order to come up with the yellow color, the colors red
and green are processed. The black color is the outcome of the
combination of the other three processed colors. The importance
of black in printing is that it adds intensity to printed
images.
The crude way of printing images or pictures is to break it into
its four color components by the use of a process camera as well
as four filters. The process camera is a special type of camera
which is designed for copying flat art. It makes used of a high
resolution flat field lens used to take pictures of flat
objects. The process camera also works well for line shots
images that have no gray tones, halftones or color separations.
On the other hand the filter to be use requires fine screen made
up of dots. Individual screens are used to filter the four
colors. After which the film would then be process and then
printed on a metal plate that is specially designed for such
purpose. The next step would require placing of the metal plate
on the printing press.
However, the four color process is not without flaws. Most of
the common problems encountered with the use of four color
process is the difficulty in creating vibrant colors
specifically when it comes to the colors red and violet. Another
drawback is the expensive cost of correcting colors. An example
of an error in color is when images appear too dark. However,
the quality of colors is also dependent on the type of paper
used. The difference in the quality of colors is imminent
especially when applied in a textured and high quality
reflective paper. The high quality reflective paper is best
preferred since it reflects the real quality of the colors. And
also there are instances wherein images looks good in prepress
or during the proofing stage but looks terrible when printed.
The used of water when mixing inks also results to images that
are not of good quality. There is also the tendency for the
plates to be accidentally moved from the press which would
certainly mess up the colors.
For comments and suggestions regarding the article kindly visit
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Color Printing
About the Author
Jinky C. Mesias is a graduate of Bachelor of Science in Business
Administration Major in Business Management. She is at present
an Associate Manager of a Life Insurance Corporation and a
freelance writer.
Lens Used
