QUICK ADVICE PLEASE

looking at a lens on e-bay 70-200 2.8is.Seller says it has the start of pin-cushioning at would require optics cleaned.I googled pin-cushioning and it said it affects tele lens at max.Is this a problem ,how much to clean optics?Auction ends soon so fast responce required. thanks in advance

Pin cushion is a type of distortion. That has to do with how a lens is designed, not how dirty the glass is.

I wouldn't buy that lens. The seller has no idea what they're talking about or you're not understanding what they said.

The only way I'd buy that lens is if it was if I could buy it for so little that after I spent the money to repair it I could still sell it for a large profit. Way to much risk for me.

Pass.

J-Blake wrote in post #9560847
The only way I'd buy that lens is if it was if I could buy it for so little that after I spent the money to repair it I could still sell it for a large profit. Way to much risk for me.

auction at £800 sterling.Don't want to miss a bargain

Here is a depiction of pin-cushioning which is normally associated on the long end of the telephoto lens:

http://www.dpreview.co​m …key=pincushion+​distortion

The distortion results on this lens performed by SlrGear are here below:

http://www.slrgear.com …uct.php/product​/57/cat/11

Distortion
As with shading, so went distortion: On our EOS-20D test body, distortion ranged from a 0.2% barrel at 70 mm to 0.16% pincushion at 200mm, passing through zero distortion at 100 mm.

Regards ,

Silverfox1 wrote in post #9560908
Here is a depiction of pin-cushioning which is normally associated on the long end of the telephoto lens:

http://www.dpreview.co​m …key=pincushion+​distortion

The distortion results on this lens performed by SlrGear are here below:

http://www.slrgear.com …uct.php/product​/57/cat/11

Distortion
As with shading, so went distortion: On our EOS-20D test body, distortion ranged from a 0.2% barrel at 70 mm to 0.16% pincushion at 200mm, passing through zero distortion at 100 mm.

Regards ,

Am i right to say pin-cushioning is not a problem and lens would be ok to buy?

jc450d wrote in post #9560984
Am i right to say pin-cushioning is not a problem and lens would be ok to buy?

IMHO, only if this particular seller has an authentic minimum 7 day return policy would i even consider the lens. I have the 70-200 F4L IS and do not notice any obvious distortion at 200mm.

Regards whatever your decision !