Quarter moon 9/19/07

[kmorgan]

Took a few tonight with my 70-300 on the Rebel XT. This is the one I like best.

Make:
Canon
Model:
Canon EOS DIGITAL REBEL XT
F stop:
F/11.0
Exposure:
1/30 sec.
Focal length:
300.0 mm



Kevin

 

[w7xman]

Great contrast and shadows, and most importantly with night photography...great sharpness. The shadows in the craters look very crisp. Just nice shots!

Shutter speed and exposure perfect, just one question from the exif...what was the iso if you don't mind?

I forget how big the moon looks at 300mm...I gotta get me one again soon!

 

[kmorgan]

ISO at 100. For good exposure starting points I use:

The Shaytech Moon Exposure Calculator

Kevin

 

[DougPaul]

Nice shot.

Shutter speed and exposure perfect, just one question from the exif...what was the iso if you don't mind?

Remember, the moon is a sun-lit object, so it is only a bit dimmer than a daylight terrestrial scene. A terrestrial scene will be lit by a combination of direct and scattered light, the moon light is only diminished by the atmospheric scattering. The net effect is, as noted above, slightly dimmer than a daylight scene.

The moon is also fairly dark rock and fairly low contrast (when full) so a bit of contrast enhancement can help.

time      F    iso   eFL    FL     FLr      cam
1/400    5.6   100   469   300    70-300    XT

Taken handheld leaning against a railing. Probably IS.
RAW file, small amount of contrast enhancement and sharpening.

Doug

 

[forestgnome]

Whoa! Those are both really nice. Thanks for sharing the image data on both.

 

[Grumpy]

ISO at 100. For good exposure starting points I use:

The Shaytech Moon Exposure Calculator

Kevin

Thanks for posting the link to that exposure calculator.

Beautiful tonality and crispness in your photo. Is that the full frame we are looking at?

G.

 

[DougPaul]

Is that the full frame we are looking at?

Mine is a 1:1 scaling. The moon and sun are each about 1/2 degree wide and approximately fill a 35mm frame (top-to-bottom) if you use a 2000mm lens. (Learned this while shooting a solar eclipse...)

While I can't speak for kmorgan, comparing his to mine suggests that his is about 1/2 scaling and with a 300mm lens (~500mm eFL), the height of a frame would be about 4 moon diameters. Thus I suspect that his is cropped--mine certainly was.

Doug

 

[kmorgan]

Thanks for posting the link to that exposure calculator.

Beautiful tonality and crispness in your photo. Is that the full frame we are looking at?

G.

No, that's cropped. Here's the original.



Kevin

 

[Grumpy]

Thanks for the replies on the moon cropping.

Kevin, what is the eFL (effective, or 35mm equivalent) multiplier for the Canon camera body you are using?

Also, what kind of camera support did you use for your shot?

G.

 

[DougPaul]

what is the eFL (effective, or 35mm equivalent) multiplier for the Canon camera body you are using?

Both of us used EOS Digital Rebel XT bodies--crop factor 1.6 for an eFL of just under 500mm.

All of the Canon EOS Digital Rebels (original, XT, and XTi) and the 20D, 30D, and 40D are all 1.6.

I used the the Canon EF 70-300 f/4.5-5.6 IS USM lens, the info that kmorgan has given is consistent with his having used the same one.

Doug

 

[kmorgan]

Thanks for the replies on the moon cropping.

Kevin, what is the eFL (effective, or 35mm equivalent) multiplier for the Canon camera body you are using?

Also, what kind of camera support did you use for your shot?

G.

Like Doug says, 1.6x, so 70-300 is 105-450 equivalent. I am using a Manfrotto 3021BPro tripod with a 486RC2 Compact Ball Head. Nice solid tripod.

Kevin