Recent content by Andy Resnick

Our 5-year old goofball named "Bruce" aka "Brucifer" aka "Bruce the Goose" aka "Buxton Fatty Boom-Boom" (his official AKC name):

This next sample demonstrates how much I have learned during this 'experiment'- there is no way I would even have attempted this back when I was starting out almost 3 years ago... it's been 3 years already? Skarn (skarnoid?), Fen Complex. “A skarn is a metasomatic rock typically formed at...

For this image, the main deficiency (IMO) is where focus has been placed. I would have expected it at the group of black keys in the lower right corner, not smack in the middle of the image. Personally, I would have used a lower f/# to narrow the depth of focus.

Since you are soliciting feedback... I have some (hopefully) helpful suggestions/comments for these three. The middle (color) image is really great- the shadow connecting basketball hoop with doorway leads the eye really effectively, and by keeping the ground not-level, you maintain a sense of...

Since I will be sans interweb for a few days, this week's post is a bit early. Alkali-Feldspar Trachyte (QAPF field 6), Fen complex. I mentioned previously that the remaining Fen rock samples are more complex and I no longer have reference materials to guide me. This one is the first of...

Not quite done, but good enough for now: This panorama of the Virgo cluster is (approximately) 3 x 4 fields using my 400mm lens covering (about) 15 x 10 degrees of sky. Markarian's chain and associated 'loop' of Messier objects fit nicely in a single field of view: It's taken a while but...

Thanks, but I don't understand...? Jupiter's diameter is 143000 km, if that's what you mean.

A brief macrophoto essay: first 2 images are micro nikkor 55mm, the remaining also use the M2 extender, to shoot at 1:1 reproduction @ f/11, auto ISO. Started out on a wooded trail, hoping to take photos of bugs: But then So, no bug photos. But that's ok- tree bark in sidelight produces...

Clear nights have been scarce lately, but tonight I was able to image Jupiter and the Galilean moons: This is a 200% crop from a single shot (14-bit RAW) that I saved as 2 jpgs, one tone-mapped to make the moons visible (so the planet was overexposed) and the other tone-mapped to reveal the...

Transition rock between phonolite (left) and country rock (Telemark gneiss). The gneiss could either be a megacryst or the true chilled margin. Because this magmatic intrusion is not from a carbonatite magma, the gneiss is not fenitized. Below: Within the gneiss, K-feldspar (dusty in PP due...

You are studying a very complicated topic, primarily because the air-liquid interface is free to deform and not a boundary condition. I am not aware of 'elementary' treatments of the topic, but a good source to try is: J. J Stoker "Water Waves: the mathematical theory with applications"...

Altered tinguaite/rhomb porphyry (foid-bearing alkali-feldspar trachyte, QAPF zone 6b), Fen complex. Classified as trachyte due to lack of quartz, plagioclase, and near-lack of nepheline (or any other foid). Nepheline is only a minor component of the rock, a few small (lightly) altered...

This type of measurement was a major part of my dissertation. As you have noticed, it's not a simple measurement. I have a few thoughts/suggestions: Most important: what is your measurement goal in terms of accuracy and precision? Do you want 2 significant digits or 4? "As accurate as...

Tinguaite/Altered foid-bearing trachyte (QAPF field 6b), Fen complex. Brownish smears on 1:1 image are artifacts (dirty slide) and not part of sample. This rock could be classified as Tinguaite due to the presence of aegirine needles in the groundmass, but the needles, being randomly oriented...

Yes, there is still a hydrostatic pressure head, but other forces dominate in microgravity- capillary forces, etc. Astronauts lose bone mass because of the lack of bouyancy. But perhaps the OP was a bad question- imagining a large ship on a larger body of water without gravity present is...