The 6mm Brandon flat top eyepiece by Vernonscope is best used with slower end focal ratios (f/7 or higher) due to its ability to provide high contrast views, specifically when viewing planets and star systems. While it can be used with fast focal ratios, it is best used with higher ones.
The Brandon parfocal eyepiece design is known for their high contrast and dark background, which have made them a very popular design since 1971. The design was praised and rated #1 by deep sky observer Ron Morales for the remarkable contrast. There are no multi-coatings in Vernonscope Brandon lenses to prevent light scatter which would hinder resolution and contrast.
All Brandon eyepieces are tested in Raleigh, NC.
|Name||Vernonscope - Brandon 6mm 1.25" Parfocal Brandon Ocular Eyepiece - Flat Top|
|Apparent Field of View||42 degrees|
|Field Stop Diameter||4.4mm, as measured with caliper|