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Saludos a todos. Tengo una duda sobre el uso y construcción interna de los codos coronado BF 30 comparado con los codos BF10 o BF15. Internamente tienen filtros distintos, desconozco si se usan en configuraciones ópticas diferentes hablando si usan ethalones frontales o internos. El codo BF30 es mucho más oscuro y tiene 3 elementos filtrantes, alguien tiene exp...

Anyone know how to stabilize the riser for the AZ 100? I have the basic model mounted on a Losmandy G-11 tripod with an adapter made by Stellarvue. I have a Stellarvue 152 which with diagonal and eyepiece tops out at about 30 lbs. I noticed slight breeze sent it into quite a wobble thru the eyepiece. The mount itself works beautifully and with no wind it's not a problem. ...

I run https://backfocus.tools/, a free calculator that works out the spacer stack between a corrector and a camera sensor. Each catalogue figure on it quotes the manufacturer's wording, with a link and the date I checked it. Some of its retailer links are affiliate links; the stack itself is worked out from the physical gap only and never sees a price. Building it showed me that...

This morning session was quickly clouded out and although the sky cleared in the afternoon, that wasn't forecast and I was on to other obligations and couldn't take advantage of that better opportunity to image this prominence which showed some activity. Image, such as it is, links to my Astrobin page. Rick Prominence Animation:

Here is my observation of Saturn on October 9, 2026, around 9:00 PM, with an elevation a bit greater than 30 degrees. This is only my second observation of Saturn in 2026. The observation was made using my 12" Dobsonian telescope (300x1500) on a manual mount plus four different eyepieces: 15mm, 9mm, 4.7mm, and 34mm. The sketch was mostly done with the 15...