Thursday, August 30, 2007

Shooting the Moon

Caucasus Mountains, 05Aug07
Notice the Caucasus Mountains, just east of the terminator, but still in sunlight.


It seems that a lot of people like my lunar photos, taken with a plain Fuji S700/S5700 low-cost camera, and I get a lot of questions about how I do it. So I thought I'd write up a little blog entry here with the details.

1) In order to get maximum resolution from refractive optics (your lens, in other words) you want to operate at the highest F-number you can get. This means closing the lens aperture as far as you can. On my camera f-13.5 is as high as I can go. Your lens might offer f-16, f-22, or even f-32. If so, use the highest F-number you can.

2) The most attractive moon photos can be had when the moon is between a thin crescent and first-quarter or so because you will have nice sharp shadows on the surface of the moon. Everybody likes to shoot the full moon but a full moon has no shadows and looks pretty flat and boring.

3) Because we will use a high F-number, the required exposure time will range from around 1/40th of a second for a full moon up to 1/2 second or longer for a thin crescent moon so a tripod is a requirement.

4) Use the highest resolution your camera can do. Use ASA 100 film speed in order to minimize noise from the CCD. Set jpeg compression to the highest quality and largest image, or shoot raw. If your camera has a "sharpness" setting, set it for maximum sharpness.

5) Use a delayed release on the shutter because touching the camera causes the tripod to vibrate and it takes about a second or two for the vibrations to die out after you take your hands completely OFF the camera. Just because the camera's display does not seem to show vibration does not mean there is none. Vibrations of 2 or 3 pixels amplitude are invisible on the LCD display. I use 2 seconds, gently press the shutter release and then remove my hands completely. I also sit absolutely still. I shoot from a wooden porch usually and if I move at all the camera will vibrate. Remember that you are trying to get every pixel sharp and so the SLIGHTEST vibration will blur the image. If the wind is blowing, forget it. If you have problems with vibration, try hanging a ten pound weight from the center post of the tripod. Many tripods are equipped with hooks for this purpose. This will cut down on vibrations a lot.

Once you are ready, zoom in all the way, focus or set the lens to infinity focus, choose a trial exposure time, and see what you get. If the exposure is too dark or too light, change the shutter speed to compensate. Always leave the lens set to the highest F-number possible.

Too dark is better than too light. You can brighten a dark image fairly well in post-processing (PhotoShop or whatever) but an overexposed blown out image is useless.

Take numerous shots. Some will have vibrations that you did not perceive at the time. Bracket your shutter speeds. You might even bracket the focus if you are not sure of perfect focus. I usually take about 15 to 20 shots and hope that one or two will come out okay.

Lastly, crop the image so the moon dominates the photo and then you might try a bit of image enhancement. Use the "unsharp mask" function (Laplace transform) at very mild settings. Since you have likely cropped a 3,000 by 2,000 image down to 400 by 400, and you are going for fine details, use a small matrix. Many "unsharp mask" functions default to a 50x50 matrix and that's way to big. Try a 4x4 or 5x5 matrix. Play with it and see if it makes it slightly better.

And that's it. Good luck!

Moon 27Aug07 2
Before and after "unsharp mask" enhancement.


Wednesday, August 29, 2007

Bio and Profile:

Hello all. I'm a hardware and software engineer, now running a corporate / legal transcription business in partnership with my daughter. Originally from California, I live in Guatemala and am interested in writing, economics, politics, history, photography, fountain pens, languages, ham radio. I play keyboards (pipe organ, piano). Been doing web design since 1996. These days I enjoy building web based systems around AJAX.

My Stuff

Primary web site is here: http://www.mayaparadise.com

Photos on Flickr: http://www.flickr.com/photos/shuttersparks/

Maya Paradise Photo Group on Flickr: http://www.flickr.com/groups/mayaparadise/

My personal blog is here: http://shuttersparks.blogspot.com/

My Guatemala News Blog is here: http://maya-paradise.blogspot.com/

My YouTube Channel is here: http://www.youtube.com/user/udoober

Hit me up on Twitter here: http://twitter.com/KW2P

I also hang out on Fountain Pen Network as CaptNemo: http://www.fountainpennetwork.com

My own message board here: http://www.mayaparadise.com/bbs.asp

And on the Rio Dulce Chisme forum: http://www.riodulcechisme.com/bbs/

Email me at felipe@conexion.com

Background

I've been designing electronics since childhood and writing software since 1968 and have created many designs and systems in many fields. Some of my fields of expertise are:

Software expertise ranging from tiny 4-bit embedded microprocessor systems to mainframe operating systems.
Analog and digital hardware design.
Ultra-high security access control systems.
Cryptography
Seismology and seismic imaging.
Image processing.
Digital signal processing.
Graphics programming.
Real-time process control, servo systems.
Analog and digital sound/music synthesis.
Game design.
Photogrammetry, cartography.
I hold patents in the fields of networking, seismic/medical imaging, and others.

"And that's all there is to say about that."
--Forrest Gump

Tuesday, August 28, 2007

Opening Gambit

Hello Everyone!

This is an experimental blog post in order to get a feel for how this works.


Let's try a small photo with link:
Deadly Nightshade


Okay. It seems to be working. Yay.