Archive for the ‘digital photography’ Category

Happy Thanksgiving!

November 22, 2017

On the traditional day when we give thanks for our many blessings, I am especially thankful for the opportunity to be a frequent and careful observer of the natural beauty of several wildlife parks located in Northern Virginia, and for many good friends with whom I share the experience. Happy Thanksgiving! Now let’s have some turkey…

A tail feather from a Wild Turkey (Meleagris gallopavo) was photographed in situ along Easy Road at Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA.

A wing feather from a Wild Turkey was photographed in situ along Easy Road near the preceding tail feather.

Lots of animal scat, possibly from Wild Turkey, was observed along Easy Road near the Wild Turkey feathers shown above.

Did you notice the brown flies on the animal scat? They may be Scathophaga furcata, a species of dung fly. Thanks to Matt Pelikan from the BugGuide Facebook group and Charles Davis from the Capital Naturalist Facebook group for help in identifying the flies!

Related Resource: The Feather Atlas – Flight Feathers of North American Birds, U.S. Fish & Wildlife Service Forensics Laboratory.

Copyright © 2017 Walter Sanford. All rights reserved.

Advertisements

Bridge across Marumsco Creek

November 20, 2017

I think I must have been an explorer in a past life. When odonate-hunting season ends, I like to explore new places to hunt for dragonflies and damselflies during the next year, such as Marumsco Creek, Prince William County, Virginia USA.

16 NOV 2017 | VMRP | bridge across Marumsco Creek

The preceding photograph shows a small bridge across Marumsco Creek, accessible from Veterans Memorial Regional Park (VMRP). If you were to cross the bridge and continue walking along Highams Court, then you would end up at the intersection with Dawson Beach Road, near Occoquan Bay National Wildlife Refuge.

A close look at a trail map of Occoquan Bay NWR shows Marumsco Creek forms one of the natural boundaries of the refuge. Marumsco Creek, mostly located in restricted areas of Occoquan Bay NWR, is practically inaccessible from the refuge. Veterans Memorial Regional Park features a wooded trail located alongside Marumsco Creek. Access problem solved!

Directions: Jefferson Davis Highway (U.S. Route 1) to Featherstone Road. Immediately after a railroad crossing, bear left on Featherstone Road. Featherstone Road morphs into Veteran’s Drive at the boundary of Veterans Memorial Regional Park: same road; new name.

Tech Tip: I used my Panasonic Lumix DMC-ZS150 superzoom camera to shoot the landscape photo featured in this blog post. The camera was set for manual focus at the hyperfocal distance for an aperture of f/4, based upon the instructions provided in the excellent video tutorial by Graham Houghton, “Panasonic Lumix FZ camera easier manual focus method — super point-and-shoot tip.”

Copyright © 2017 Walter Sanford. All rights reserved.

Eastern Gartersnake

November 18, 2017

An Eastern Gartersnake (Thamnophis sirtalis sirtalis) was spotted during a photowalk along Easy Road at Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA.

After taking a closer shot of the snake’s head (above), I backed away for a wider view that shows the snake is a little more than two (2) feet in length (below).

Eastern Gartersnakes can be differentiated from Common Ribbonsnakes (Thamnophis sauritus sauritus) by the presence of “dark vertical lines on the supralabial scales.” This key characteristic is shown clearly in the following photo.

Copyright © 2017 Walter Sanford. All rights reserved.

Five Guys

November 16, 2017

Several Autumn Meadowhawk dragonflies (Sympetrum vicinum) were spotted along Easy Road at Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA. All of these individuals are male, as indicated by their terminal appendages.

Did you notice the preceding male appears to be missing his right hind wing? Perhaps I should rename this blog post “4.75 Guys.”

Editor’s Note: The photos in this gallery were taken a day before the first hard freeze in Northern Virginia that occurred overnight on Friday-Saturday, November 10-11. It will be interesting to see how many Autumn Meadowhawk dragonflies survived the record-setting low temperatures in the mid- to upper 20s.

Copyright © 2017 Walter Sanford. All rights reserved.

The Road Taken

November 14, 2017

Two ruts converged in a yellow wood,
And sorry I could not travel both
And be one traveler, long I stood
And looked down one as far as I could
To where it bent in the undergrowth…

With sincere apologies to Robert Frost for slight modification of the title and first stanza of his famous poem The Road Not Taken in order to convey my impressions of Fall 2017 at Occoquan Bay National Wildlife Refuge.

Tech Tip: I used my Panasonic Lumix DMC-ZS150 superzoom camera to shoot the landscape photo featured in this blog post. The camera was set for manual focus at the hyperfocal distance for an aperture of f/4, based upon the instructions provided in the excellent video tutorial by Graham Houghton, “Panasonic Lumix FZ camera easier manual focus method — super point-and-shoot tip.”

Copyright © 2017 Walter Sanford. All rights reserved.

Confused by mild fall weather

November 12, 2017

A frog-let/toad-let — my term for small frogs and toads — was spotted during a photowalk along Easy Road at Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA. Turns out it’s a Spring Peeper (Pseudacris crucifer), as indicated by the dark “X” on the frog’s dorsal side.

Every spring, the sound of male Spring Peepers calling for mates is deafening. You hear them, but you see them rarely. You don’t expect to see them during the second week in November!

Some amphibians have been confused by the mild weather in Northern Virginia, thinking it’s spring. The first hard freeze this fall occurred overnight on Friday-Saturday, November 10-11, when the record-setting low temperature at Reagan National Airport (DCA) was 26°F. I hope this little one hunkered down like frogs are supposed to when it’s cold.

Related Resource: Spring Peepers, a blog post by Alonso Abugattas, Natural Resources Manager for Arlington County Parks, Virginia USA.

Copyright © 2017 Walter Sanford. All rights reserved.

Unambiguously Sympetrum ambiguum

November 10, 2017

Two Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) were spotted during a photowalk along Charlie Road at Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA. Although Blue-faced Meadowhawk is on the species list of dragonflies and damselflies at Occoquan Bay NWR, this is the first time I have seen Sympetrum ambiguum at the refuge.

Male

This first individual is a male, as indicated by his terminal appendages.

19 OCT 2017 | OBNWR | Blue-faced Meadowhawk (male)

This guy was skittish. I was able to take one photo before he flew toward the tree canopy. The preceding photograph is what my good friend Mike Boatwright calls a “record shot,” that is, a photograph that records (verifies) my sighting of the male Sympetrum ambiguum. The photo was cropped slightly for improved composition.

Female

The last individual is a female heteromorph, as indicated by her tan coloration and terminal appendages.

The preceding photograph is my “record shot” of the female. I worked the shot…

…until I found the best viewpoint, shown below.

The first and last photos of the female were cropped slightly for improved composition; the second photo is uncropped.

Copyright © 2017 Walter Sanford. All rights reserved.

Autumn Meadowhawks (mating pairs, in tandem)

November 8, 2017

Two mating pairs of Autumn Meadowhawk dragonflies (Sympetrum vicinum) were photographed at Hidden Pond, Meadowood Recreation Area (MRA), Fairfax County, Virginia USA. Both pairs are “in tandem.”

The first pair is perching on the small wooden dock at Hidden Pond: the male is on the upper-right; the female is on the lower-left.

27 OCT 2017 | MRA | Autumn Meadowhawk (mating pair, “in tandem“)

The last pair is perching on an American sweetgum tree (Liquidambar styraciflua) growing alongside the dock. I love the way the fall coloration of the tree leaves complements the coloration of the dragonflies! The male is on the upper-left; the female is on the lower-right.

27 OCT 2017 | MRA | Autumn Meadowhawk (mating pair, “in tandem“)

Tech Tips

The photographs in this gallery were taken using my Panasonic Lumix DMC-FZ150 superzoom digital camera set for ~24x zoom (focal length of 600mm, 35mm equivalent), and Canon 580EX Speedlite external flash (manual mode).

In order to reduce “camera shake,” the camera was set for shutter priority mode. Using the reciprocal rule, the shutter speed was set for 1/800s. The ISO was set for “100.” An inexpensive Sunpak 6700M aluminum monopod was used for added stability.

Copyright © 2017 Walter Sanford. All rights reserved.

Lumix loves him some head-tilts!

November 6, 2017

An Autumn Meadowhawk dragonfly (Sympetrum vicinum) was spotted at Hidden Pond, Meadowood Recreation Area, Fairfax County, Virginia USA. This individual is a male, as indicated by his terminal appendages.

Regular readers of my photoblog know I’m fond of head-tilts in which the dragonfly seems to display some of its personality, especially when the individual is looking at me (below).

OK, so no head-tilt in the last photo, but I like the knot in the wooden dock on which the dragonfly is perching.

Tech Tips

The photographs in this gallery were taken using my Panasonic Lumix DMC-FZ150 superzoom digital camera set for ~24x zoom (focal length of 600mm, 35mm equivalent), and Canon 580EX Speedlite external flash (manual mode).

In order to reduce “camera shake,” the camera was set for shutter priority mode. Using the reciprocal rule, the shutter speed was set for 1/800s. The ISO was set for “100.” An inexpensive Sunpak 6700M aluminum monopod was used for added stability.

Copyright © 2017 Walter Sanford. All rights reserved.

Autumn Meadowhawk dragonflies (mating pairs)

November 4, 2017

This blog post features more photos taken using my Fujifilm X-T1 digital camera, Fujinon XF55-200mm zoom lens, and a Fujifilm MCEX-11 extension tube. The camera was set for manual focus in order to use focus peaking; back-button focusing was used to focus automatically.

In wheel

ISO 640 | 200mm (~300mm, 35mm equivalent) | f/11 | 1/500s | 0.33 ev

Two of many mating pairs of Autumn Meadowhawk dragonflies (Sympetrum vicinum) were photographed on 27 October 2017 at Hidden Pond, Meadowood Recreation Area, Fairfax County, Virginia USA. Both pairs are “in wheel“: the male is on top; the female is on the bottom.

ISO 800 | 200mm (~300mm, 35mm equivalent) | f/18 | 1/500s | 0 ev

In tandem

The last mating pair is “in tandem“: the male is on the upper-right; the female is on the lower-left.

ISO 800 | 200mm (~300mm, 35mm equivalent) | f/16 | 1/500s | 0 ev

After copulation, Autumn Meadowhawks engage in a form of guarding behavior known as “contact guarding,” in which the male and female fly “in tandem” to egg-laying sites. Contact guarding is used by some species of odonates to prevent aggressive males from hijacking the female.

Related Resource: Adding an 11mm extension tube, a blog post by Walter Sanford.

Copyright © 2017 Walter Sanford. All rights reserved.


%d bloggers like this: