Monday, March 30, 2009

coming up next - UV filters test

Different brand and grade!


personal review coming up next or you can download it to test with Photoshop using this method. (thanks to Calvin for the great sharing). You can also read more at Photomalaysia forum here.


quote from Calvin "

What filter is attached to the lenses that you are using now?

Ever wonder what is the difference between a high-grade UV filter and a low-grade UV filter? Have you ever find out?

Here is a simple experiment you can do it at home.

Objective: To compare the quality of the available protective filter and rank them accordingly

Items:
1. One piece of white paper (a regular A4 paper will do)
2. Choice of your UV filters

Methodology:
1. Put all the filters on top of a piece of white paper.
2. Check the clarity visually to get a visual confirmation
3. Snap a photo of the filters arranged
4. transfer the photo into your Photo processing software (ACDSee pro will do)
5. Increase the Level and Contrast until you tell the difference.

Experiment report:
Refer to the picture #1 attached. The one left is Nikon NC Filter (worth RM230), on the right is Hoya UV Filter (worth RM120), and on the top is Marumi UV Filter (worth RM30 at most).

You will find that the Nikon NC Filter is the clearest among all three, Hoya UV Filter is slightly darker with a little yellowish, and the Marumi UV Filter is the darkest. Yes, I know it rather difficult to tell the difference especially based on a picture, but trust me, it is very clear if you see the experiment right before you.

In case you still can’t tell the difference, Picture #2 I attached is the same photo with high contrast to help you see better.

Conclusion:
The type of materials that called thin glass may not look as simple as you might think of. The thin glass itself will affect the penetration of light.

So do you still think the simple UV/NC filters are made equally? Think again, what lenses are you using now? Perhaps it is time to evaluate your filters attached with it.

Full report of Filter comparison is posted in: http://www.calvinstudio.net/?p=523 "


2 comments:

Kancil Killer said...

If you think you can use the above photo as benchmarking, you can't.

1. The photo taken must have an even source of lighting on all four corner of the photo in order to have accurate benchmarking.

1. Noticed your photo is taken with a tilted angle, make sure it is taken straight on top, 90'. Use tripod, a professional tripod that can use for product/Macro photography.

2. If you try increase the contrast using leveling of the photo taken, you will notice a few problems with your photo.

a. vignetting effects that from your lens. You need to take the photo without any vignetting. Try set the aperture to F8.

b. the contrast inside the filter are uneven, and the bright side are pointing towards Kenko direction. Indicates there are one light source pointing at Kenko filter, uneven and bias towards Kenko.

c. the contrast inside Kenko filter also splits into half, above is brighter, and below is dimmer with a clear horizontal split. I guess the light source could be some kind of neon desk lamp or something similar happened shines towars kenko caused a slight reflection to your lens.

project3 aka Kennie said...

kancil killer

thanks for the info. will retake the photo again.