I just bought a 1.4x II canon extender few days ago for my 70-200L 2.8 IS. I check the unit before I left the store and everythings was okay. The salesman & I check it by lighting it with a white led torch. I also look at the lens front to rear with a white paper at the background. Evrything was pefect. So, I brought it home & can't wait to try it.

At home when I was about to start, I tried looking at it on a halogen desk lamp for last check for dust & smear etc ... I discovered one glossy round dot (like flare of a lens). Tried to clean it with my new lens pen but no success in removing it. So, I when back to the shop the next day to change it. So I got a new unit. Did check it out and again everything is fine. Tried it the whole afternoon & enjoyed it very much. At home I did check it again with halogen desk lamp. I discovered same dot but now its two. So , I learned that it more effective to check it with a halogen light. Then I did check all my lenses, the rest is okay except I made a new discovery on my one month old 70-200 L 2.8 IS. I found a internal small dust or fiber look a like inside the lens.

I brought it to the shop and show them the two glossy spot inside the 1.4x II Extender. Luckily, they got me a new from the other branch. I check it with my small Maglight torch, both sides are clear. But with regards to 70-200 L 2.8IS they advise me to bring it to canon for cleaning or replacement. Hoping they will replace.

My question are :

1) This small fibers inside the lens will affect quality of the photo ?
2) What is the standards ? How Clear is Clear ?
3) Is it safe if they open the lens ?
4) Will it affect the functions or mechanism if it has been opened ?

I will bring it to canon tomorrow for warranty service.

Pls.. Advise and share some experience regarding lens service. Sorry for I have to many questions. :)

Thanks .....

have it checked immediately, it might be a mold or some on its early stages.

uhm, you used a maglight to light on one element then peer at the other side? never heard of this test before, can you share? might be a good thing to learn and understand.....also the white paper thingy you did....thanks a lot

have it checked immediately, it might be a mold or some on its early stages.


Kaso public holiday pala today. Canon is close ! Frustrating nga sir.

Thanks

uhm, you used a maglight to light on one element then peer at the other side? YES ....... never heard of this test before, can you share? ITS UNORTODOX TEST, I ONLY LEARNED IT IN THE SHOP WHERE I BOUGHT MY EQUIPMENTS. THE ONLY DIFFERENCE IS I USE HALOGEN YELLOW LIGHT WHERE IN THE SHOP THEY USE WHITE LED. I DISCOVERED IT ACCIDENTALY. might be a good thing to learn and understand.....also the white paper thingy you did....thanks a lot WITH REGARDS TO THE WHITE PAPER BACKGROUND ITS A GOOD COMBINATION USING A HALOGEN YELLOW LIGHT (CONTRAST) COMPARE WHITE LIGHT & WHITE BACKGROUND. GIVE IT A TRY LANG SIR. HOPE I EXPLAINED IT RIGHT. EXPERIMENT KO LANG KASI.

HAAY NAKO PUBLIC HOLIDAY PALA..... SERVICE CENTER IS CLOSE. :Angry:

THANKS.

I brought my 1.4xII extender & 70-200 2.8L IS to canon HongKong this pm. Wish me luck. They will you play all the 400 & 500 L lens with 30D at the show room too. Good news they have free delivery service after servicing your camera and lens.

what happend w/ the lens? was the fiber removed? what was it?