Zoom Lens 75-300mm User

Koji™ · 31-07-2010, 12:27 AM

Got this lens but seldom use. But I notice whenever I try to take a distant picture of an object, some of the edges will look neon in a way. How to solve this issue? Is a UV filter a solution?

Subject was taken outside my window this afternoon.
Can spot the discolouration on the branches?

reddi · 31-07-2010, 01:16 AM

bro koji,

the "neon color" thing you mentioned is known as chromatic aberration CA or commonly known as purple fringing as it is usually purplish in color, sometimes it gets bad enough and it will be thicker and look greenish too. it usually occurs at borders between high contrast edges like the bright sky and the dark branch and also at the tail tip of the bird against the bright sky.

this is inherent of the lens and a uv filter does not help. most zoom lens will have this problem especially at the tele end. some higher end lenses minimize this CA by using special glasses and coating and hence the much higher price.

Koji™ · 31-07-2010, 01:26 AM

Quote:

Originally Posted by reddi

bro koji,

the "neon color" thing you mentioned is known as chromatic aberration CA or commonly known as purple fringing as it is usually purplish in color, sometimes it gets bad enough and it will be thicker and look greenish too. it usually occurs at borders between high contrast edges like the bright sky and the dark branch and also at the tail tip of the bird against the bright sky.

this is inherent of the lens and a uv filter does not help. most zoom lens will have this problem especially at the tele end. some higher end lenses minimize this CA by using special glasses and coating and hence the much higher price.

Ah... I see... So I guess a higher aperture can help abit in this?

reddi · 31-07-2010, 01:37 AM

Quote:

Originally Posted by Koji™

Ah... I see... So I guess a higher aperture can help abit in this?

very little i think. if you are gonna take high contrast shots, then take in raw format, Canon's DPP has a function to correct this CA if i am not mistaken.

Koji™ · 31-07-2010, 01:41 AM

Quote:

Originally Posted by reddi

very little i think. if you are gonna take high contrast shots, then take in raw format, Canon's DPP has a function to correct this CA if i am not mistaken.

Alright. Will give it a try tomorrow. Thanks bro.

tridentdiscus · 31-07-2010, 05:11 PM

Koji,
Birding? Bro reddi is spot on with his answer. Looks like time to buy a new
lens

31-07-2010, 12:27 AM	#1
Koji™ Account Disabled Join Date: Jul 2001 Posts: 57,626	Zoom Lens 75-300mm User Got this lens but seldom use. But I notice whenever I try to take a distant picture of an object, some of the edges will look neon in a way. How to solve this issue? Is a UV filter a solution? Subject was taken outside my window this afternoon. Can spot the discolouration on the branches? Last edited by Koji™; 31-07-2010 at 12:29 AM.

31-07-2010, 01:16 AM	#2
reddi Senior Dragon Join Date: Jan 2007 Posts: 3,446	bro koji, the "neon color" thing you mentioned is known as chromatic aberration CA or commonly known as purple fringing as it is usually purplish in color, sometimes it gets bad enough and it will be thicker and look greenish too. it usually occurs at borders between high contrast edges like the bright sky and the dark branch and also at the tail tip of the bird against the bright sky. this is inherent of the lens and a uv filter does not help. most zoom lens will have this problem especially at the tele end. some higher end lenses minimize this CA by using special glasses and coating and hence the much higher price.

31-07-2010, 05:11 PM	#6
tridentdiscus Dragon Join Date: Jun 2007 Posts: 906	Koji, Birding? Bro reddi is spot on with his answer. Looks like time to buy a new lens

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