Baader Astrosolar Photo film ND 3.8

September 23, 2016 // by ecuador

In a previous Solar filter test I explored how various filters help with getting some better white-light Solar surface feature photos, and I had noted that while I was using the Baader Astrosolar Safety ND=5.0 film, some narrowband filters would benefit from the photo grade Astrosolar ND=3.8 film, as with allowing as much as 1/6310 of the […]

Celestron, iOptron, Losmandy, Orion, Sky-Watcher, Vixen telescope mount comparison table.

September 19, 2016 // by ecuador

Price update Jan 9 2017: Some price updates. A few impressive price drops, the CEM25 in the UK (£699 from £899), the Orion HDX110 ($3505 from $4499!) and CGEM DX in the US ($1695 from $1999), otherwise mostly price increases in the UK, due to the $1=£0.82 exchange rate. Note Oct 3 2016: After over a decade […]

Mid-high End ($3-15k) Telescope Mount Comparison Table

September 13, 2016 // by ecuador

I while ago I made a comparison table for mass-production mounts under $5k and some nice charts with its data. Since I was recently looking at the mid/high end mount category, which is even less straightforward, I thought it would be interesting if I made a similar table. So, this time nicer small mounts like […]

Baader Astrosolar vs Thousand Oaks Black Polymer solar filter

September 11, 2016 // by ecuador

There are two popular kinds of inexpensive solar filters which you can buy in unmounted sheets, cut them and mount them yourself. The older kind is the black polymer type, with the most famous kind (especially in the US) being the one that Thousand Oaks makes (their glass filters are also popular), while the currently […]