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  1. Re-eyed vireo, Colorado

    Re-eyed vireo, Colorado

    Red-eyed vireo spotted along a river/lake
    • DJ ODonnell
    • Media item
    • 500mm (effective 750mm) lens colorado larimer county nikon d500 re-eyed vireo vireo olivaceus watson lake open space
    • Comments: 2
    • Category: North America
  2. Virginia Rail Chick, Colorado

    Virginia Rail Chick, Colorado

    This chick was out with an adult
    • DJ ODonnell
    • Media item
    • 500mm (effective 750mm) lens colorado larimer county loveland nikon d500 virginia rail chick
    • Comments: 2
    • Category: North America
  3. Virginia Rail, Colorado

    Virginia Rail, Colorado

    Adult rail in the wetlands west of our home
    • DJ ODonnell
    • Media item
    • 500mm (750mm effective) colorado larimer county loveland nikon d500 rallus limicola virginia rail
    • Comments: 4
    • Category: North America
  4. Virginia Rail in Colorado

    Virginia Rail in Colorado

    A pair of Virginia Rails have been hiding out in some reeds/cattails in a pond near our home
    • DJ ODonnell
    • Media item
    • colorado larimer county loveland nikon 500mm f/5.6 pf lens nikon d500 rallus limicola virginia rail
    • Comments: 4
    • Category: North America
  5. Two arguing eagles

    Two arguing eagles

    The female was definitely not happy
    • DJ ODonnell
    • Media item
    • argument bald eagle colorado haliaeetus leucocephalus larimer county loveland
    • Comments: 1
    • Category: North America
  6. Two arguing eagles

    Two arguing eagles

    The male tried to get a word in edgewise
    • DJ ODonnell
    • Media item
    • argument bald eagle colorado haliaeetus leucocephalus larimer county loveland
    • Comments: 1
    • Category: North America
  7. Two arguing eagles

    Two arguing eagles

    She was having none of it!
    • DJ ODonnell
    • Media item
    • argument bald eagle colorado haliaeetus leucocephalus larimer county loveland
    • Comments: 4
    • Category: North America
  8. DJ ODonnell

    Any good aftermarket MB-D17 knockoffs?

    When you say, "vertical grip," are you meaning the MB-D17 battery grip? It does have a shutter release that will allow you to take photos in the portrait orientation. Can you order one online? If so, you could order a Nikon MB-D17 online from several online stores like B&H photo, or used...
  9. American Dipper under the overpass

    American Dipper under the overpass

    A pair of nesting dippers were active at an underpass along the Big Thompson River
    • DJ ODonnell
    • Media item
    • american dipper cinclus mexicanus colorado loveland nikon 500mm f/5.6 pf nikon d500
    • Comments: 3
    • Category: North America
  10. Watson Lake landing on the cliff

    Watson Lake landing on the cliff

    Watson Lake, Larimer County Colorado, is home to a pair of nesting golden eagles. This eagle had just been relieved at the nest and was enjoying a little free time.
    • DJ ODonnell
    • Media item
    • aquila chrysaetos colorado golden eagle larimer county
    • Comments: 2
    • Category: North America
  11. Neighborhood Golden Eagle

    Neighborhood Golden Eagle

    While watching a lake full of red-head ducks, the local golden eagle flew directly overhead. This photo is only slightly cropped. It was that close.
    • DJ ODonnell
    • Media item
    • 500mm f/5.6 pf lens aquila chrysaetos colorado golden eagle loveland nikon d500
    • Comments: 3
    • Category: North America
  12. DJ ODonnell

    Focal length ?

    The D500 has a DX sensor (23.5 mm x 15.7 mm), which equates to a 1.5 crop. The full frame 500mm PF will have an apparent focal length of 750mm. Thus, any lens on a camera with a cropped sensor will have a longer effective focal length.
  13. American Dipper

    American Dipper

    One of two that were contesting the territory below an overpass
    • DJ ODonnell
    • Media item
    • american dipper cinclus mexicanus nikon 500mm pf f/5.6 lens nikon d500 camera
    • Comments: 1
    • Category: North America
  14. American Dipper

    American Dipper

    One of two that were contesting the territory below an overpass
    • DJ ODonnell
    • Media item
    • american dipper ×cinclus mexicanus. ×nikon d500 camera ×nikon 500mm pf f/5.6 lens
    • Comments: 1
    • Category: North America
  15. Ferruginous Hawk Yoga

    Ferruginous Hawk Yoga

    This hawk had been standing in one spot for over a half hour, and finally needed a stretch. So did the photographer.
    • DJ ODonnell
    • Media item
    • buteo regalis colorado ferruginous hawk nikon 500mm pf f/5.6 lens nikon d500 camera
    • Comments: 3
    • Category: North America
  16. DJ ODonnell

    Any tips or info for transitioning to a Nikon d500?

    I don't know if it is possible with the 200-500 zoom, but you should look into the autofocus correction in the D500. With the 500mm PF a slight adjustment made for sharper photos on my rig. To catch birds in flight, don't zoom in too tight if the bird is on a perch. It'll fly out of frame before...
  17. DJ ODonnell

    Upgrading from Sigma 150-600 C to Nikkor 500mm PF

    Telephoto zoom lenses do offer flexibility when in the field by letting the photographer choose the focal length to frame the subject. However, that flexibility comes at a cost. At the far end (> 300mm) the image sharpness starts to fall off. To counter act this, the lens must be stopped down to...
  18. Little Blue Heron in Colorado

    Little Blue Heron in Colorado

    There has been quite a buzz about this guy showing up in Colorado!
    • DJ ODonnell
    • Media item
    • egretta caerulea little blue heron loveland colorado nikon 500mm f/5.6 pf lens nikon d500
    • Comments: 3
    • Category: North America
  19. Dark morph Ferruginous hawk

    Dark morph Ferruginous hawk

    Spotted on a nearby hill, it circled me as it flew off.
    • DJ ODonnell
    • Media item
    • boulder county buteo regalis colorado ferrugious hawk nikon 500mm f/5.6 nikon d500
    • Comments: 2
    • Category: North America
  20. Northern Pygmy Owl

    Northern Pygmy Owl

    One of a pair of owls hanging out along a road near our home.
    • DJ ODonnell
    • Media item
    • boulder county colorado glaucidium gnoma longmont nikon 500mm f/5.6 pf lens nikon d500 northern pygmy owl
    • Comments: 2
    • Category: North America
  21. Golden Eagle, Winter Flight

    Golden Eagle, Winter Flight

    A twenty minute wait standing in a snow drift paid off!
    • DJ ODonnell
    • Media item
    • aquila chrysaetos boulder county colorado golden eagle nikon 500mm f/5.6 pf lens nikon d500
    • Comments: 4
    • Category: North America
  22. Golden Eagle, Winter Flight

    Golden Eagle, Winter Flight

    A twenty minute wait standing in a snow drift paid off!
    • DJ ODonnell
    • Media item
    • aquila chrysaetos boulder county colorado golden eagle nikon 500mm f/5.6 pf lens nikon d500
    • Comments: 1
    • Category: North America
  23. Golden Eagle, Winter Flight

    Golden Eagle, Winter Flight

    A twenty minute wait standing in a snow drift paid off!
    • DJ ODonnell
    • Media item
    • aquila chrysaetos boulder county colorado golden eagle nikon 500mm f/5.6 pf lens nikon d500
    • Comments: 4
    • Category: North America
  24. Ferruginous Hawk

    Ferruginous Hawk

    This guy was on a berm for about 30 minutes while another photographer and I waited for our chance. It was worth the wait
    • DJ ODonnell
    • Media item
    • boulder county buteo regalis colorado ferruginous hawk nikon 500mm f/5.6 pf lens nikon d500 rabbit mountain open space
    • Comments: 5
    • Category: North America
  25. Ferruginous Hawk

    Ferruginous Hawk

    This guy was on a berm for about 30 minutes while another photographer and I waited for our chance. It was worth the wait.
    • DJ ODonnell
    • Media item
    • boulder county buteo regalis colorado ferruginous hawk nikon 500mm f/5.6 pf lens nikon d500 rabbit mountain open space
    • Comments: 3
    • Category: North America
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