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Old May 10, 2006, 7:24 PM   #1
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Just to remind you that there is a bright planet following the moon:

Jupiter and its moons.

FZ5, 12* zoom, 18* teleconverter, cropped -> appr. 8000mm focal length!
(as I said ...)





Just for comparison. This slice of the moon was taken with this equipment:



.. there will be sharper images soon, but I liked this first test.

Sven
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Old May 11, 2006, 5:34 AM   #2
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style="BACKGROUND-COLOR: #000000"the moon looks so near with your super lenses
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Old May 11, 2006, 11:53 AM   #3
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Sven-

Your stacked lens is getting a pretty good reach and detail. As a comparison, the following is a digiscoped shot I took last month that compares very well -- even with the viginetting. Jay Turberville's nifty Javascript calculator site -- http://www.jayandwanda.com/digiscope...cope_calc.html

calculatesmy digiscoped FZ5/scope combo with the following input/data yields:

Camera settings: f/3.3; 30mm-5X zoom; ISO 80; Center Weighted Avg metering; 1/6-sec exposure (Used Focus Lock Button then fine tuned EVF image with scope focus and 10-sec timer). Camera was on separate tripod aimed into the eyepiece

Scope:76mm Obj. Lens/700mm Focal Length (f/9.2) reflector ; 20mm eyepiece

Jay's calculator indicates: Effective system f/13.82 or yielding -- 35X effective zoom; Actual combo focal length: 1,050mm or ... 12,600 mm (35mm film eq.)!


Jay's calculator allows one to input the scope and camera data to calculate the digiscope's system effective yield and also allows one to see how it correlates to the camera's chip illumination and calculated resolution detail, as well. It has drop down lists for various spotting scope and digi cameras dataor one can just input the direct data for both to calculate the combinations effective data.

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Old May 12, 2006, 4:59 AM   #4
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nice shot!

The moon is an oversized cheese surrounding the earth!

If I would gone through all these numbers, there would never have been a single moon shot with my camera.

Have you found the exact level of the entrance pupil for the FZ with changing zoom levels? - perhaps behind the camera ;-)

Sven


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Old May 12, 2006, 4:11 PM   #5
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seemolf wrote:
Quote:
Have you found the exact level of the entrance pupil for the FZ with changing zoom levels? - perhaps behind the camera ;-)

Sven

Sven-

I'm not sure if/how much the different zoom levels affect the entrance pupil but I ran some different aperature numbers on Jay's site and it reported back:

f/2.8 6.43mm Entrance Pupil Diameter

f/3.3 5.45mm

f/4 4.5mm

f/5 3.6mm

f/6 3.0mm

f/7 2.57mm

f/8 2.25mm

f/9 2.0mm

f/10 1.0mm

Pretty small even at the f/2.8 aperature so the eyepiece would need a good eye relief and exit pupil diameter to preclude viginetting. I suppose it also depends on the depth of the aperature blades behind the front of the Pany's lens vis-a-vis the eye relief of the eyepiece. As I remember, if the eyepiece's exit diameter is smaller than the camera's entrance diameter, viginettng can occur... My photo above was at 3X zoom and f/3.3 and had possibly 50% viginetting as I remember...
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Old May 12, 2006, 5:02 PM   #6
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thanks telecorder,
....all these numbers....
I will stay with try and error.
Fantasy is better than knowledge, because fantasy is unlimited (A.E.)
Sven
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Old May 13, 2006, 7:37 PM   #7
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Thanks Sven (and Telecorder) for taking us so far.

Sven you really have no boundaries, in every sense/meaning.
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Old May 14, 2006, 1:57 AM   #8
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thanks Franscesco,

but this was just a spinoff when I tested a better reversed lens for macro.
This was the time when telecorder started a jupiter challenge.
So I simply adjusted a 500mm tele in front of the ocular/reversed lens.
I thought of some decent moon shots. But knowing there is no sense in using teleconverters above 1,7 with the FZs there was little hope.....

These are full frame shots - click to enlarge in a separate window -







http://www.geocities.com/seemolf/pictures/moon.html

At least I have got some "moon macros"

Sven

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