06-22-2018, 09:06 AM
And as to front light conditions: did you actually test that?
My own test showed that with a really good filter transparency is even better.
Every filter is worse optically than no filter on the front of a lens!..............see here: Lenstips brand comparison.
https://www.lenstip.com/113.1-article-UV_filters_test.html
Actually there are many fake filters about these days on line, I tried a couple of Hoya multi coated filters which were selling at around 10 euros from Amazon, my thinking being that I could return them if necessary. The printing on the filter ring did look fake, but they were certainly multi coated and from the testing I did they came out as good filters with no real impact on the images beyond the expected....however, at standard and wide angle focal lengths.
The IQ impact on longer focal lengths is greater, when you shopping for 95mm filters a pop that cost more than the mm diameter. For example, I tried a filter on the Pentax FA* 300mm F4.5......even with a know Hoya HMC filter sharpness was significantly lower to the point of a kit lens.
Now I only use a filter on the Sigma 150 macro.....because I have one and because I poke it all sorts of "grotty" macro subjects!
....................................................................................................................................................................................................
OT. Here's a recent "stacking" image that I made from 40 images using just a wooden board and a LED macro ring on my Flickr page: (the every first image)
https://www.flickr.com/photos/124690178@N08/
My own test showed that with a really good filter transparency is even better.
Every filter is worse optically than no filter on the front of a lens!..............see here: Lenstips brand comparison.
https://www.lenstip.com/113.1-article-UV_filters_test.html
Actually there are many fake filters about these days on line, I tried a couple of Hoya multi coated filters which were selling at around 10 euros from Amazon, my thinking being that I could return them if necessary. The printing on the filter ring did look fake, but they were certainly multi coated and from the testing I did they came out as good filters with no real impact on the images beyond the expected....however, at standard and wide angle focal lengths.
The IQ impact on longer focal lengths is greater, when you shopping for 95mm filters a pop that cost more than the mm diameter. For example, I tried a filter on the Pentax FA* 300mm F4.5......even with a know Hoya HMC filter sharpness was significantly lower to the point of a kit lens.
Now I only use a filter on the Sigma 150 macro.....because I have one and because I poke it all sorts of "grotty" macro subjects!
....................................................................................................................................................................................................
OT. Here's a recent "stacking" image that I made from 40 images using just a wooden board and a LED macro ring on my Flickr page: (the every first image)
https://www.flickr.com/photos/124690178@N08/