Altair Diagonal Prism / Unboxing, Review, Day And Night Observation
HTML-код
- Опубликовано: 3 окт 2024
- Quality prism diagonals give far light less scatter than coated mirrors and therefore better contrast than any diagonals using reflective mirror surfaces, including dielectric ones. Prism diagonals are therefore especially good for high power planetary and lunar observing where sharpness and contrast are critical, especially with high quality refractors with an F7 or longer focal ratio. Perfect for serious planetary observers wanting a low scatter premium prism with superb mechanics to match.
Regardless of the coating method used, all reflecting mirrors consist of tiny particles evaporated onto glass which, no matter how carefully deposited, will produce light scatter and reduce contrast.
Based on your video I bought one, works brilliantly, very heavy and feels superb!
They are perfect for lunar and planetary observing!
@@TheAstronomer not bad on bright DSOs either, M51 looked fantastic through my Bresser 127 L
I know this video is like 300 years old but move the camera back and make it better. I appreciate your aiding us but try reviewing the video before you release it just saying thanks
My meade 5.5 mm and saxon /hyperion 21mm are very good near as good as deloi..must get this prism for my sct and 4 inch f7 apo ..cheers thanks
Prism diagonals are very good for bright objects like planets and Moon. They provide sharp, contrasting, true colour images.
@@TheAstronomer thanks ..Ill use it for doubles too should help splitting Pi Aquillae etc
Because the light has to pass through the glass, it is best used on objects which are bright, so on dim objects like nebula the prisms are not much different to mirror diagonals. Prisms are good for observing binary stars because they provide sharp, contrasty image.
How does it compares agains a good dielectric mirror diagonal (i.e. the Baader Click lock dielectric)? Does it shows more contrast and scatter?
It is better than Baader diagonal which I have but inferior to the Astro Physics one which I also have. Please see my latest video uploaded today.
Does this give a correct image for daytime terrestrial viewing? 43mm clear aperture right?
Thanks
The 90 degrees diagonals are for Astronomical use. For day time right-up views the 45 degree diagonals are better.
Sure . But can’t really find any 45 degree one with big aperture works with 38 mm 70 degree fov 2 inch eyepiece without vignetting.
Harrison Telescopes sells it for £99. Please search these key words: "SKYWATCHER 2 INCH ERECTING PRISM (45 DEGREE ANGLED)".
Also in eBay there is a used one for £74: "High Quality Antares Correct Image 45 degree SCT 2 inch Diagonal. Mint no box."
Amazon also have it in USA.
Just bought it but the eyepiece I mentioned above vignetting . Very restricted the fov. Clear aperture must be around 30mm.
I suppose the only way is to get one and see if it has the right aperture. Have you tried to see the Antares one in ebay? I think your problem would be a nice topic to start in Cloudy Nights forum in USA. Somebody may already had a solution. Please search these key words. It seems people have worked out something there :
"Cloudy Nights, vignette, 2 inch 45 degrees diagonal". Please go to first search result and see the reply that user Mr Bill have received from William Optics.
Did I hear you right when you said you paid £60 for this? Do you mind telling where you purchased the prism diagonal from, please?
Astromart, second hand.
@@TheAstronomer Aah cheers, thanks!
Hallelujah hehe !!
Do you know if I can get an sct screw nosepeice for this, or will it need a visual back? Im interested in gettng this.
I don't know what is the difference, but if you buy a cheap (2 inch or 1 1/4") attachment, one side with internal screw to go to the back of the Maksutov Telescope and the other side for insertion of the diagonal. Try Rother Valley Optics.
@@TheAstronomer I was just looking through rvo for adaptors, my concern is the light length for the prism being too long, as ive read they prefer shorter, so I was trying to reduce the diagnonal + a visual back or a baader clicklock vb adaptor). Im also concious that with it being a large 2" diagonal it might smack into my fork mount (i have a cpc 800).