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 Why when using tele the edges of the object, tends to have blur outline or slight blu

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nairud
post Mar 2 2007, 08:23 PM

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QUOTE(cjtune @ Mar 2 2007, 08:13 PM)
I think for the D40, the AF lock indicator is still turned on and fully functional even though you're using fully manual focus with a lens?
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Yes, i know. That's why i said he might not know about it. even 350D has that feature smile.gif
TSlittlegreen
post Mar 2 2007, 08:26 PM

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QUOTE(cjtune @ Mar 2 2007, 08:13 PM)
I think for the D40, the AF lock indicator is still turned on and fully functional even though you're using fully manual focus with a lens?
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okok what does it means... blush.gif
cjtune
post Mar 2 2007, 08:34 PM

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QUOTE(littlegreen @ Mar 2 2007, 08:56 AM)
what is tele mainly used for other than modeling shots


Added on March 2, 2007, 8:57 amas most of the time i prefer kit lens
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Sniping other people? Long reach keeps you away from being noticed so the subject's response stays natural.

user posted image

Some subjects you just can't get near to (physical barrier like a fence or water) so you need a long focal length.

user posted image

Some telephotos have great near-macro capabilities too.

user posted image

I shot the above photos with the 1970's Vivitar Series 1 70-210mm f/2.8-f/4 lens.


I wish I could afford better... but apart from it's rather bad chromatic abberation and poor contrast (it's sharp though), it's pretty fun to use.


Added on March 2, 2007, 8:36 pm
QUOTE(nairud @ Mar 2 2007, 08:23 PM)
Yes, i know. That's why i said he might not know about it. even 350D has that feature smile.gif
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LOL. Confirmed.

This post has been edited by cjtune: Mar 2 2007, 08:36 PM
TSlittlegreen
post Mar 2 2007, 08:36 PM

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yupyup.. mine is tele macro....


Added on March 2, 2007, 8:45 pmk.. thank for the explanation


Added on March 3, 2007, 2:42 amlook closely ur pic also got some blue edges

This post has been edited by littlegreen: Mar 3 2007, 02:42 AM
cjtune
post Mar 3 2007, 04:09 PM

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QUOTE(littlegreen @ Mar 2 2007, 08:36 PM)
yupyup.. mine is tele macro....


Added on March 2, 2007, 8:45 pmk.. thank for the explanation


Added on March 3, 2007, 2:42 amlook closely ur pic also got some blue edges
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A lens is generally considered a macro lens if it has near 1:2 reproduction ratio.
1:1 means that the object appears on the sensor the same size as in real life.

The blue edges are the chromatic abberation I mentioned about.
It's a 1970's lens design and made for film cameras, so it's probably a typical performance on digital bodies. By today's standard, it's a low-end lens. But try and find one with f/2.8-f/4 at S$136...
The 'proper' lens I should be using is the S$1600 50-200mm ED Olympus Zuiko Digital. But I am hesitant to spend more on Olympus gear as I may jump over to Canon later. Well, let's see what gets announced by Olympus at Photokina in a day's time.


Added on March 3, 2007, 4:25 pmBTW, don't despair about getting chromatic abberation aka. 'blue/purple fringing' in your photos. They can be removed by software. My Paint Shop Pro v10 does a decent job at it.


This post has been edited by cjtune: Mar 3 2007, 04:25 PM
TSlittlegreen
post Mar 3 2007, 06:28 PM

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oh,, ok at least there is a solution.. i feel relieve now with that.. thank man
pinkygirl
post Mar 4 2007, 04:25 PM

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i think that most tele can have very good macro ...
cjtune
post Mar 4 2007, 10:25 PM

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QUOTE(pinkygirl @ Mar 4 2007, 04:25 PM)
i think that most tele can have very good macro ...
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Nope. Even though the longer focal lengths permit a larger object magnification, most telephotos have a long (1m+) minimum focal distance. I think the normal magnification factor for most telephotos is like 1:2.5 to 1:5. Plus, they are usually not optimised for sharpness at very close focal distances.



 

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