Digitally Optimised (DG) Filters
EX DG filters benefit from Sigma's multi-layer lens coating, developed to counteract the highly reflective characteristic of image sensors. With older style filters, light would reflect off the image sensor, bounce off the lens and filter elements and re-enter the image sensor, creating a ghost image. The multi-layer coating dramatically reduces this effect. In addition to this, an optimum, neutral colour balance is ensured, increasing the white balance accuracy of the digital camera.
Multi-coated UV Filter
This filter perfectly eliminates the harmful effect of ultraviolet light. The multi-coated UV filter can be used with both colour and black-and-white film anddigital sensors. This is the most suitable filter for protective use and generalphotography.
Reviewed by 2 customers
It's not a $75 filter, but a Sigma Filter on a Sigma lens works perfectly. No added distortions and good protection. My previous filter took a hit and did it's job. This one fits well and I'm satisfied. Would recommend. Thanks Adorama.
I have found the Sigma DG series filters to be excellent for UV and lens protection. I have not had any problems with flare or reflection and have them on all my lenses. You can pay a lot more for digitally optimized filters, but I don't think you can tell any difference in the photo quality between these and the higher priced brands.