• Welcome to BirdForum, the internet's largest birding community with thousands of members from all over the world. The forums are dedicated to wild birds, birding, binoculars and equipment and all that goes with it.

    Please register for an account to take part in the discussions in the forum, post your pictures in the gallery and more.
ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

Recent content by DJ ODonnell

  1. 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...
  2. 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
  3. 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
  4. 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
  5. 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.
  6. 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
  7. 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
  8. 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
  9. 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...
  10. 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...
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
See more
Back
Top