Registered since September 28th, 2017
Has a total of 3445 bookmarks.
Showing top Tags within 3 bookmarks
Tag selected: exposure.
Saved by uncleflo on February 23rd, 2019.
Brass will automatically start to tarnish if exposed to oxygen. The only way to prevent polished brass from tarnishing is to coat it with a layer of clear sealer that will prevent air from reaching the brass itself. Many brass surfaces come with this finish originally, but it can wear down over time. Refresh the coating every few years to keep the brass shiny and like-new without frequent polishing. A clear polyurethane sealer will protect the brass from oxygen exposure without causing discoloration.
article construction build howto exposure brass metal petina tarnish coat layer clear sealer prevention surface finish original new look refresh shiny polish discoloration blog instruction step by step ship boat
Saved by uncleflo on January 6th, 2019.
This is a simplified subjective method of testing lenses optical sharpness. This should not be confused with tests for focus accuracy and discrimination in a 3D environment, that is a totally different issue although often confused by the inexperienced. A focus accuracy test is suggested here Focus Test. The advantage over this method, compared to just taking a shot of a garden etc, is elimination of variables such as subject and camera movement, insufficient depth of field, flatness of field and variations in focus location. It uses a nice consistent high contrast subject to make comparisons easy; checking sharpness on general photographic views is not very easy. As the method is subjective, it is worth testing against a known good lens for comparison.
sharpness histogram sharpen broadsheet flatness clipping lens stabilizer timer infinity check focal pixel recommend exposure adjust compensate focus filter optical hardware camera comparison accuracy precise precision photo photography test testing environment confuse compare equipment standard quality
No further bookmarks found.