Lense 'smeared' at DVinfo.net

Nathan Quattrini · August 15th, 2007, 11:13 PM

Apparently when I changed filters the other day the UV didn`t screw on right, and it along with the lense cap fell off inside my carry bag. The lense on the camera had a scuff mark on it. I didn`t realize when I took it out that it was the lense and not the UV ( I thought I just forgot to put the lense cap on during packing) and wiped it with a lense cloth and lense cleaning paper. Now there is like a slight discolored swirl that you see only from certain angles with light reflecting off it. Its a very slight discoloration from the rest of the lense. Will this be noticable in the image? Did i damage the lense? The lense cloth was brand new and i didn`t use any solution to clean it. There are no scratches but my heart is racing because i don`t have time to send it out if its a problem. Help.

Don Palomaki · August 16th, 2007, 06:54 AM

The front element is probably a protective piece of flat optical glass, not a focusing element.

If you see the smudge only when light hits it at an angle, it is probably just a slight compromise of the anti-reflective performance of the lens coating. It may even just be a result of some residual smudge left over from the cleaning, and a better cleaning might remove it.

Any effects would probably be very subtle and difficult if not nearly impossible to see in normal video. If you can see it at all, it might appear as a hint of reduced contrast in the image. It maybe more visible if direct sun (or other bright light source) was hitting the lens, or in very bright light if the camcorder was in macro focusing mode and stopped down to a small aperture.

Bottom line, if you can't see it in your video on a good monitor, don't sweat it.

Matthew Nayman · August 16th, 2007, 08:30 AM

Hey Nathan...

Use some lens tissue and fluid. Put the fluid right on the tissue and coat the lens in fluid from the tissue (never directly apply from bottle).

Use a dry tissue now to evenly wipe away the fluid. Gently, don't swirl. Make sure you get all the corners.

You can use a q-tip for the corners, but it can leave hairs.

If this doesn't remove your swirl, try again... it will eventually go away (it's a greasy coating on your lens front which has an anti-reflective coating).

Typically, as long as your lens isn't scratched, it should be possible to return it to pristine condition through careful cleansing, blowing away of dust, brushing with a camelhair brush, and more lens fluid if needed.

Eric Weiss · August 16th, 2007, 12:31 PM

it should be fine.

i'm always shooting in humid conditions and even with a clean
lens cloth i get those swirls. it's never shown up on my footage.

August 15th, 2007, 11:13 PM	#1
Nathan Quattrini Major Player Join Date: Jan 2007 Location: Warwick, Rhode Island Posts: 740	Lense 'smeared' Apparently when I changed filters the other day the UV didn`t screw on right, and it along with the lense cap fell off inside my carry bag. The lense on the camera had a scuff mark on it. I didn`t realize when I took it out that it was the lense and not the UV ( I thought I just forgot to put the lense cap on during packing) and wiped it with a lense cloth and lense cleaning paper. Now there is like a slight discolored swirl that you see only from certain angles with light reflecting off it. Its a very slight discoloration from the rest of the lense. Will this be noticable in the image? Did i damage the lense? The lense cloth was brand new and i didn`t use any solution to clean it. There are no scratches but my heart is racing because i don`t have time to send it out if its a problem. Help. __________________ Cinematography Site

August 16th, 2007, 06:54 AM	#2
Don Palomaki Wrangler Join Date: Sep 2001 Location: Northern VA Posts: 4,489	The front element is probably a protective piece of flat optical glass, not a focusing element. If you see the smudge only when light hits it at an angle, it is probably just a slight compromise of the anti-reflective performance of the lens coating. It may even just be a result of some residual smudge left over from the cleaning, and a better cleaning might remove it. Any effects would probably be very subtle and difficult if not nearly impossible to see in normal video. If you can see it at all, it might appear as a hint of reduced contrast in the image. It maybe more visible if direct sun (or other bright light source) was hitting the lens, or in very bright light if the camcorder was in macro focusing mode and stopped down to a small aperture. Bottom line, if you can't see it in your video on a good monitor, don't sweat it. __________________ dpalomaki@dspalomaki.com

August 16th, 2007, 08:30 AM	#3
Matthew Nayman Major Player Join Date: Feb 2005 Location: Toronto Posts: 917	Hey Nathan... Use some lens tissue and fluid. Put the fluid right on the tissue and coat the lens in fluid from the tissue (never directly apply from bottle). Use a dry tissue now to evenly wipe away the fluid. Gently, don't swirl. Make sure you get all the corners. You can use a q-tip for the corners, but it can leave hairs. If this doesn't remove your swirl, try again... it will eventually go away (it's a greasy coating on your lens front which has an anti-reflective coating). Typically, as long as your lens isn't scratched, it should be possible to return it to pristine condition through careful cleansing, blowing away of dust, brushing with a camelhair brush, and more lens fluid if needed.

August 16th, 2007, 12:31 PM	#4
Eric Weiss Major Player Join Date: Mar 2007 Location: Philly,PA Posts: 360	it should be fine. i'm always shooting in humid conditions and even with a clean lens cloth i get those swirls. it's never shown up on my footage.