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sheeny
15-07-2006, 07:45 PM
Just got back yesterday from a week on the NSW north coast - Grafton to be exact. Had wonderful weather, but did no real observing apart from an unsuccessful attempt to see the Moon occult Antares...

But I did spend a couple of days at the beach - Brooms Head and Minnie Waters - and gave the 20x80Ts a run at whale watching. The bees knees for the job... practically the veritable wasp's nipples! The whales were, I would estimate, roughly 8ks out (eye level about 3-4m above sea level and the whales on the horizon - does that sound about the right distance? I can't find a handy reference... There must be an old salt here who can convert that description to a distance!) but the 20x80s did a great job o bringing them close enough to make out detail!

While there I also took a few panoramas. Seaside panoramas are difficult to do due to the lack of fixed points on the horizon for alignment. These 3 look OK when reduced in size for the web, but if you look really closely you might be able to pick the alignment errors in 2 of them.

The first at Brooms Head is a 180 degree panorama with my partner Lyn doing some whale watching through the 20x80s. 7 images with the C5060WZ.

The second was taken from the headland at Minnie Waters. 6 images with the C5060WZ.

The last one is 4 images from the northern end of Minnie Waters Beach. The joins are perfect in the full size original on this one thanks to the land on the horizon.:thumbsup:

All were assembled with autostitch, cropped and saved for the web with PS CS2.

Al.

sheeny
15-07-2006, 07:50 PM
PS I tried assembling the middle one with both Arcsoft Panorama Maker and PS CS2 but could do no better! Nothing for it but some patience and careful application of the clone tool to fix that horizon!

Al.

joe_smith
16-07-2006, 02:56 AM
Excellent shots sheeny they look unreal :thumbsup:, did you see any whales ?

JohnG
16-07-2006, 10:35 AM
G'Day Al

If I remember correctly from my Naval days, a person at sea level of normal height, say 6ft, will see the horizon just on 3 miles away, at a height of 20 meters, will see about 9.5 miles, there is a formular but I can't remember it. Naked eye ofcourse.

Nice shots. :thumbsup:

Cheers

JohnG

sheeny
16-07-2006, 01:01 PM
G'Day Joe and John!

Yes we certainly did see whales - humpbacks (and we also saw dolphins in the surf at Brooms Head). Apart from the normal spouts as they come up to breathe, quite a few were having a play - breaching high and splashing about and flapping their tails - generally having a whale of a time!:P (I just had to do it!)

Thanks John... sounds like I might have over estimated the distance. From your description its maybe closer to 4-5 ks?

Al.

JohnG
16-07-2006, 01:06 PM
Al

Found the formular for you:

If the height in feet of an observer is h, then the distance in miles to the horizon is shown to be the square root of 3h/2.

JohnG

sheeny
16-07-2006, 08:47 PM
OK... let's see. I reckon eyelevel was about 12 feet, say above sea level... 3 x12 / 2 = 18. The square root of that's about 4 and a bit miles (doing this in my head... just thought I'd mention that if you feel like challenging my precision!:D ). So, say, about 7-8 ks?...

Hang on a minute... this seems too close to my original estimate! I'm gonna have to work it out now with a calculator...

7.6 ks roughly!:thumbsup:

Cool! Thanks John!

Al.

RB
17-07-2006, 01:19 PM
Those shots look great Al, very interesting indeed.

joe_smith
19-07-2006, 02:21 PM
You learn something new everyday :nerd: