I actually bought two different filter sizes. The 70mm filter for my Celestron DX 12X56 and a 60mm filter for my wide's Bushnell H2O 10X42. My eyes are 77 years old and both have a intraocular lens (IOL) that gives me vision that is good enough to drive without glasses, My IOL lens do have just a touch of birefringence and that tends to make the edges of things just a little fuzzy; so, take my opinions on the sharpness of images with a grain-of-salt.
For the price I think that the filters are well made and I especially like the fact that the solar filters are recessed in from the outside edge as this goes a long way in preventing scratches on the filter. I like that both sets of filters are completely blackened on the inside. The felt strips that come with the filters for sizing the filter to your specific optical device are a little tricky to figure out, you just grab the black felt and rip off the white cover paper. After struggling with the first filter the next three filters were sized smoothly.
My viewing technique is always the same, I focus the the binoculars on a terrestrial object then put on the filters and look at the sun. I look at the edge of the sun and get to my final best focus and then move on to sunspots. The 10X binoculars shows the sunspots as extended black objects but no detail; the 12X binoculars start to show detail on the larger sunspots. Both binoculars give views that are a tremendous improvement over any 1X solar eye shield. Bracing or tripod…
