Hi Pirots,
Telescope adapters for lenses are useful, but almost no camera lens is as good as a good telescope. Even a 600mm f/4 is not as good as a 6 inch astro scope.
A 600mm f/4 Canon, Sony, Nikon or Leica lens probably costs £10k new.
A £1,500 astro refractor will beat it.
The normal telescope adapters are 10mm or 12.5mm focal length giving say 60x on a 600mm lens.
One needs a 2x or 3x Barlow or teleconverter, which then gives 120x and 180x.
They also are not usually phase corrected, but I don't find this to be a problem.
There was a Tamron 18mm right angle converter, which worked well with teleconverters.
The back end of the Pentax 500mm mirror scope also fits T2 lenses and will take 0.965 inch eyepieces.
But astro scopes are better.
The Meopta might do better if you can get a 100x to 150x eyepiece but you might need a custom adapter.
And 80mm aperture is too small really at 1.5 miles.
For looking at seals at 1.5 miles you need a good quality astro scope, say a Skywatcher ED 120mm minimum or 150mmm ED. And a good example.
A cheaper option is a 150mm or 180mm Maksutov, but they have temperature problems.
The main problem is choosing Seeing conditions good enough to see detail at 1.5 miles in daylight.
Just randomly picking the time will be a disappointment. One has to become a good weather watcher. Even then only about a quarter of times will be good at 1.5 miles in daylight terrestrially.
It can be done, but needs care, attention and patience.
I think that you would sell the Meopta fairly easily at a fair price if in good condition.
Regards,
B.
Telescope adapters for lenses are useful, but almost no camera lens is as good as a good telescope. Even a 600mm f/4 is not as good as a 6 inch astro scope.
A 600mm f/4 Canon, Sony, Nikon or Leica lens probably costs £10k new.
A £1,500 astro refractor will beat it.
The normal telescope adapters are 10mm or 12.5mm focal length giving say 60x on a 600mm lens.
One needs a 2x or 3x Barlow or teleconverter, which then gives 120x and 180x.
They also are not usually phase corrected, but I don't find this to be a problem.
There was a Tamron 18mm right angle converter, which worked well with teleconverters.
The back end of the Pentax 500mm mirror scope also fits T2 lenses and will take 0.965 inch eyepieces.
But astro scopes are better.
The Meopta might do better if you can get a 100x to 150x eyepiece but you might need a custom adapter.
And 80mm aperture is too small really at 1.5 miles.
For looking at seals at 1.5 miles you need a good quality astro scope, say a Skywatcher ED 120mm minimum or 150mmm ED. And a good example.
A cheaper option is a 150mm or 180mm Maksutov, but they have temperature problems.
The main problem is choosing Seeing conditions good enough to see detail at 1.5 miles in daylight.
Just randomly picking the time will be a disappointment. One has to become a good weather watcher. Even then only about a quarter of times will be good at 1.5 miles in daylight terrestrially.
It can be done, but needs care, attention and patience.
I think that you would sell the Meopta fairly easily at a fair price if in good condition.
Regards,
B.
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