Waxing gibbous, October 18, 2018

October 18, 2018, 7:28 PM

October 18, 2018, 7:39 PM. High contrast monochrome.

October 18, 2018, 10:12 PM

October 18, 2018, 10:14 PM

October 18, 2018, 10:16 PM

October 18, 2018 11:59 PM

October 18, 2018, 11:59 PM

Waxing gibbous, September 18, 2018

Waxing gibbous, Tuesday, September 18, 2018, 10:52 PM.

Waxing gibbous, April 28, 2015

I've had my new camera for over a year now and still don't know how to use most of the features on the darned thing. Today I was inspired to try something new - play with the exposure control. One of the problems with photographing the Moon is that it's so bright -  even at its crescent phases, the brightness washes out a lot of detail. I've been getting around that by using a high shutter speed feature, which takes a burst of images of very short exposure time at a much lower resolution than normal. I wondered if, by using the exposure control I could get high-resolution images that also had more detail than my usual images.

My first attempt was taken at 8:06 PM, shortly after sunset. The sky was still fairly bright. I cranked the exposure control all the way down to -2.0, and did some processing to the resulting image - brightness and contrast adjustments and unsharp masking. I was very happy with the result.

Waxing gibbous, April 28, 2015, 8:06 PM.

 I wanted to see what would happen when the sky was fully dark, so I took another photo at 9:26 PM. With this one I only applied unsharp masking; any attempts to adjust brightness or contrast resulted in undesirable results. The processed image has less contrast in the maria, but shows more detail along the terminator.

Waxing gibbous, April 28, 2015, 9:26 PM.

I'm glad that I tried this trick, and look forward to testing its effectiveness at other phases. Maybe I should go through the whole manual sometime...

Waxing gibbous, February 2, 2015, 10:07 PM

Waxing gibbous (several hours from Full), 10:07 PM, February 2, 2015

Waxing gibbous, January 31, 2015, 9:13 PM

Waxing gibbous, January 31, 2015, 9:13 PM 

Waxing gibbous, January 2, 2015

11:16 PM

11:25 PM

Waxing gibbous, January 1, 2015

9:33 PM

9:35 PM

Waxing gibbous, December 31, 2014 (evening)

8:21 PM

8:21 PM

Waxing gibbous, December 31, 2014 (early morning)

12:16 AM

12:17 AM

12:18 AM

Waxing gibbous, December 29, 2014

8:51 PM

Waxing gibbous, December 4, 2014

The weather has been unsettled lately, with snow and rain and lots of clouds. Photographing the Moon has been a hit-or-miss operation. Last night the moon was Waxing Gibbous, nearly Full, and I saw a chance during breaks in the clouds, so I took it.  

The Moon in context. Note Orion shrouded in clouds, emerging over the house. December 4, 2014, 10:27 PM.

Automatic settings, December 4, 2014, 10:29 PM. Unsharp masking applied to bring out detail.

High shutter speed settings, brightness and contrast manually adjusted, unsharp masking applied. December 4, 2014, 10:31 PM.

Sharpening the Moon

It's been pretty cloudy for the past few weeks, and getting decent Moon photos has been difficult at best. I had a productive night on Sunday, November 2, and these photos are from that session. They're variations on one image taken at 10:48 PM and another taken at 10:50 PM.

I wanted to explore the ways of sharpening images of the Moon. I've noticed some photographers at the Facebook group SHOOT THE MOON routinely get sharp, crisp images with stunning detail. How do they do that.? I pondered this for a while and then a term came back to to me from many years ago: unsharp masking.

Unsharp masking is a technique which...well, as best I understand it, it brings out details in your images by sharpening edge contrasts or something. I read about it in an astronomy magazine fifteen years or so ago. The article covered some ways to do it manually, involving stacked images with some slightly out-of-focus or overexposed or something. It also talked about techniques for manually developing photos using an unsharp mask - this was back when astrophotography often meant you were developing your own photos in your own darkroom. Now, it means you found the "Unsharp Mask" button on your free photo development software.

One of the problems with photographing the Moon is that it is so bright. This tends to overwhelm the imager, especially when the Moon is between one and three weeks old, and can create soft images that almost seem washed-out.

Waxing gibbous Moon, November 2, 2014, 10:48 PM

The Unsharp Mask feature on the GIMP software I use recommends decomposing the image into HSV format, applying the unsharp mask, and then recomposing the image. I have no idea what those words mean, but I followed the onscreen instructions (available by hitting the F1 key while hovering over the Unsharp Mask button) and the result was a subtle but detectable improvement in the image.

Unsharp mask applied per instructions

But I had had more dramatic results last night when I was playing with this. At that time I wasn't following the directions, just winging it. I decided to try winging it again, and got a more dramatic but very artificial-looking result.

Unsharp mask: winging it

Some time ago I developed my own technique for getting sharper images of the Moon when it's close to Full. I discovered the Manual setting on my camera, and through monkeying with the settings I discovered one that takes 60 images per second at a lower resolution. These images are dimmer but much less washed-out, so I can process them to bring out detail that would otherwise be lost.

High shutter speed image, November 2, 2014, 10:50 PM.

The first step in improving this image is to brighten in. How much brightening is needed depends on how bright the original image was. In this case, I brightened it by 95 somethings. (I have no idea what.)

Brightness increased by 95.

I followed this by cranking up the contrast. Through trial and error, I decided that the appropriate contrast increase would be 85 somethings. So that's where it is.

Brightness increased by 95, contrast enhanced by 85. Looks pretty good.

So there you have it: two ways of improving the appearance of the Moon. I will continue to learn the unsharp mask method, but I'm happy with my brightness and contrast enhancement technique.

Waxing gibbous, October 4, 2014

Two views of the Waxing gibbous Moon. The first was taken at 10:22 PM in "Sports" mode, which uses a high shutter speed to capture fast motion - or cut down on the effect of any microscopic vibrations in the tripod. The second was taken at 10:24 PM in a manual mode that takes a lower-resolution image at 60 frames per second. This results in a dimmer image but has the effect of filtering out the glare of reflected sunlight. Adjusting the brightness and contrast results in an image that brings out fine details of the Moon's surface otherwise lost in the glare.

September 7, 2014, 10:05 PM

Waxing gibbous, just a few hours from Full. 60fps, contrast and brightness enhanced.

Waxing gibbous, June 7, 2014

June 7, 2014, 8:46 PM

June 7, 2014 8:49 PM

April 12, 2014

An early attempt. Partly cloudy conditions.