On wednesday evening, September 20, 2023, among other binocular astronomy adventures I observed a hexagonal asterism pointed out by fellow Cloudy Nights member aznuge with an APM 20×80 binocular I had been using to log Cygni 100 list doubles (back left in image)....
A long anticipated arrival has occurred, and the Oberwerk 120XL-SD binocular telescope has returned to my Team BT, which now includes the full Oberwerk XL line-up (70XL-ED, 82XL-SD, 100XL-SD, 120XL-SD, and 127XL-SD). I evaluated the proto-type 120XL-SD several months...
A misperception exists about the capability of 10x binocular to resolve closer double stars. The actual limit is much closer than often believed. The closest double star I have resolved with a 10x binocular is 100 Herculis, which has a separation of only 14.3...
I recently added Oberwerk 7mm XL eyepieces to my equipment collection for the purpose of doing comparisons with the 7mm eyepieces I customarily use – Pentax 7mm XWs. A collimation issue has been reported concerning the XL 7mm eyepieces, such that the eyepieces have to...
It seemed like the forecast for Saturday night (4 March 2023) would not hold up, based on visual satellite imagery, but despite some hazy clouds and a 94.9% illuminated 11-day moon the skies were clear enough to do some observing so both the 25×100 ED Ultra and...
A long anticipated addition to the Oberwerk binocular offerings arrived at my door this afternoon — the 25×100 ED Ultra with reworked eyepieces to increase eye relief by 4mm (to 14mm). Hopefully this will not be too much eye relief for me, being something...
