BirdForum is the net's largest birding community dedicated to wild birds and birding, and is absolutely FREE!

Register for an account to take part in lively discussions in the forum, post your pictures in the gallery and more.

Reply to thread

Message: <blockquote data-quote="Binastro" data-source="post: 3142693" data-attributes="member: 111403">. Kiitoksia paljon, Kimmo,. In the example of the 16 inch telescope used for discovery or first sight and then being able to see the same object in a 10 inch telescope and a 6 inch telescope, in actual fact the object was eventually seen in a 4 inch telescope. And there are many similar examples.The Astro cards were great and I think they now exist in an electronic version but the physical cards were wonderful for Messier and non-Messier objects.It is very important with the Canon image stabilised binoculars to have fresh batteries.The user of the 8×25 didn't even realise his battery was exhausted.And I've often, with my excellent 18×50 Canon image stabilised binocular realised a bit late but that the battery was draining down.The optical quality and stabilisation of these Canon image stabilised binoculars does seem to vary, and I think that the 10×30 has had several changes in stabilisation method.It may seem strange that I see a 100% or slightly more improvement in reading the carrier's name on the side of the aircraft with the 8×25 binocular with the image stabilisation on or off. This was in good light. I even I think that I saw colouring in the individual letters.It is quite probable that a top quality 8×32 binocular would improve the performance of the 8×25 binocular with the stabilisation off with unknown detail but I'm pretty sure it will never equal the performance of the 8×25 binocular with the stabilisation on.It may be that an Olympic athlete, either an archer or shooter, or person skilled at meditation may be able to hold ordinary binoculars very steadily.I think that with unknown detail, the eye cannot reach the finest level of resolution that it can with a known object.Visual perception is a complex subject and is not evaluated just by using test starts.As to the speed of perception, when I was young I could identify aircraft in 1/10 of a second or less with probably 90% accuracy. In those days there were very many different shapes and types of aircraft. Nowadays, many aircraft look the same and it is much more difficult to identify them quickly, but something like a Boeing 747 I could probably identify still in 1/10 of a second.So it is familiarity with the object you are looking that the brain recognises.But there are numerous mistakes, such as the belief by famous astronomers that the planet Mars is crisscrossed with man-made canals. Just wishful thinking.. Today, sky conditions are good and there is a large protected unaided eyes sunspot.Again, I have been observing these for decades.For people not skilled at solar observation the only safe way is to project the image with perhaps a cheap and nasty 10×25 roof prism binocular onto white card. Don't risk damaging the eyepiece of a good binocular. And never risk your eyes.</blockquote>

Verification