Spots during capture at DVinfo.net

Greg Clark · July 9th, 2011, 04:26 AM

The attached frame is during a controlled shoot inside with two soft boxes. I hope you notice the spots against the black background in the attachment. I had cleaned my UV filter before using. Is it dirt on the lens, inside the lens or some other abnormality?

Roger Van Duyn · July 9th, 2011, 08:17 AM

It looks to me like dried water droplets on the lens, or on the uv filter you had cleaned. Sometimes I've had trouble cleaning those kind of droplets off, not only my cameras, but also my eyeglasses, scuba masks, etc. By trouble I mean thinking that I've gotten it all off, because the dried droplets can be hard for me to see. I doubt that it's inside the lens.

You weren't filming near the ocean were you? Sweat droplets are similar since they are both salt water.

Don Palomaki · July 17th, 2011, 07:53 AM

Looks like something on the lens, Likely an outer surface, and it maybe very subtle.

The issue is that the depth of field is so large, and the outer most optical path surface so far from the the center of the lens, anything on the surface can leave a blurred artifact in the image, especially if brignt direct or reflected light hits the spot. The black background is perfect for bringing it out.

Greg Clark · September 2nd, 2011, 05:27 PM

The problem is my Hoya UV Filter. Many people complain about difficulty in cleaning Hoya. If someone knows a way to clean the Hoya filter I would appreciate a solution. The only other alternative is no filter.

Chris Soucy · September 2nd, 2011, 09:22 PM

I've got Hoya's on both my XL1s and XH A1.

I just use a solvent spray from my optician, designed for cleaning spectacle lenses and the cloth that comes with every pair of glasses I've ever owned (which is quite a few).

Works for me, no spots, no smears, no scratched coating, nada.

CS

Bill Grant · September 4th, 2011, 04:23 PM

The reason I stopped using UV filters was this. Like a reflection on the lens. That's what it looks like to me.
Bill

Greg Clark · September 7th, 2011, 10:51 AM

I purchased a liquid that takes off most of the spots on my UV filter but I am going to go with Bill's advice. No filter.

Don Palomaki · September 8th, 2011, 04:09 AM

Install a filter only when you need it for sure for lens protection, such as wild parties with spraying carbonated liquids or close shots of babies enjoying their meals

July 9th, 2011, 04:26 AM	#1
Greg Clark Major Player Join Date: Sep 2004 Location: Surprise Arizona Posts: 297	Spots during capture The attached frame is during a controlled shoot inside with two soft boxes. I hope you notice the spots against the black background in the attachment. I had cleaned my UV filter before using. Is it dirt on the lens, inside the lens or some other abnormality? Attached Thumbnails

July 9th, 2011, 08:17 AM	#2
Roger Van Duyn Major Player Join Date: Feb 2009 Location: Lakeland Florida Posts: 692	Re: Spots during capture It looks to me like dried water droplets on the lens, or on the uv filter you had cleaned. Sometimes I've had trouble cleaning those kind of droplets off, not only my cameras, but also my eyeglasses, scuba masks, etc. By trouble I mean thinking that I've gotten it all off, because the dried droplets can be hard for me to see. I doubt that it's inside the lens. You weren't filming near the ocean were you? Sweat droplets are similar since they are both salt water. __________________ Roger My YouTube Channel: https://www.youtube.com/channel/UCAp...2AHr_pHFID5LDA

July 17th, 2011, 07:53 AM	#3
Don Palomaki Wrangler Join Date: Sep 2001 Location: Northern VA Posts: 4,488	Re: Spots during capture Looks like something on the lens, Likely an outer surface, and it maybe very subtle. The issue is that the depth of field is so large, and the outer most optical path surface so far from the the center of the lens, anything on the surface can leave a blurred artifact in the image, especially if brignt direct or reflected light hits the spot. The black background is perfect for bringing it out. __________________ dpalomaki@dspalomaki.com

September 2nd, 2011, 05:27 PM	#4
Greg Clark Major Player Join Date: Sep 2004 Location: Surprise Arizona Posts: 297	Re: Spots during capture The problem is my Hoya UV Filter. Many people complain about difficulty in cleaning Hoya. If someone knows a way to clean the Hoya filter I would appreciate a solution. The only other alternative is no filter.

September 2nd, 2011, 09:22 PM	#5
Chris Soucy Inner Circle Join Date: Feb 2007 Location: Fairfield, Dunedin, New Zealand Posts: 3,691 Images: 18	Re: Spots during capture I've got Hoya's on both my XL1s and XH A1. I just use a solvent spray from my optician, designed for cleaning spectacle lenses and the cloth that comes with every pair of glasses I've ever owned (which is quite a few). Works for me, no spots, no smears, no scratched coating, nada. CS

September 4th, 2011, 04:23 PM	#6
Bill Grant Major Player Join Date: May 2005 Location: Columbia,SC Posts: 806	Re: Spots during capture The reason I stopped using UV filters was this. Like a reflection on the lens. That's what it looks like to me. Bill __________________ Cinema Couture www.cinemacouture.com

September 7th, 2011, 10:51 AM	#7
Greg Clark Major Player Join Date: Sep 2004 Location: Surprise Arizona Posts: 297	Re: Spots during capture I purchased a liquid that takes off most of the spots on my UV filter but I am going to go with Bill's advice. No filter.

September 8th, 2011, 04:09 AM	#8
Don Palomaki Wrangler Join Date: Sep 2001 Location: Northern VA Posts: 4,488	Re: Spots during capture Install a filter only when you need it for sure for lens protection, such as wild parties with spraying carbonated liquids or close shots of babies enjoying their meals __________________ dpalomaki@dspalomaki.com