All images are ~100% crops (no up-sizing) and 2000 pixels along the long edge. Equipment included OM-1 bodies and OM 150-400/F4.5 with its internal 1.25x or OM 50-200/F2.8 lenses. Some images with the 150-400 lens used an external 1.4x. A few images were taken with a Sony A1 with 100-400/F5.6-6.3. All raw images were processed with CaptureOne, Topaz Denoise and AffinityPhoto.
Volcano hummingbird, these are tiny birds that are often chased off by larger hummingbirds 1/125, F4.5, ISO.320, 414 mm

Volcano hummingbird chasing off a bee 1/400, F4.5, ISO.250, 600 mm

Green-crowned brilliant hummingbird, 1/100, F2.8, ISO.2500, 400 mm

Another green-crowned hummingbird 1/125, F4.5, ISO 6400, 712 mm

Lesser violeteer hummingbird 1/125, F8, ISO.100, 526 mm

Our guides setup high-speed flashes to capture some hummingbirds. This enabled fast shutter speeds to stop wing motion, but its harder to identify the birds. The background was a screen. IMHO, I'm not a fan of using flashes for hummingbirds. 1/320, F11, ISO.640, 242 mm

A fiery-throated hummingbird (top) with another unidentified humminbird (flash) 1/200, F14, ISO.400, 372 mm

Mangrove swallows. These are fast-flying birds! (pre-capture allows catching 1 taking off) 1/8000, F5, ISO 2000, 390 mm

King vulture (pre-capture, take-off from trees when the rain lessened) 1/2500, F4, ISO.400, 478 mm

King vulture (a few seconds later from the pre-capture sequence) 1/500, F4, ISO.400, 478 mm

Snail kite (pre-capture, take-off from branches) 1/3200, F5.6, ISO.3200, 658 mm

Bittern, with very colorful wings when displayed in flight (pre-capture) 1/8000, F5.6, ISO.3200, 454 mm

Yellow-throated toucan, hopping along a branch 1/2500, F2.8, ISO.320, 400 mm

Posing Yellow-throated toucan 1/320, F4.5, ISO.1600, 526 mm

Firey-billed Aracari 1/2500, F5, ISO.1000, 386 mm
Montezuma orapendulum 1/250, F5.6, ISO.8000, 446 mm

Chestnut orapendulum 1/800, F4, ISO.6400, 478 mm

Black vulture (pre-capture; just after taking-off from a stump) 1/4000, F5, ISO.3200, 520 mm

Black vulture (a few seconds later from the pre-capture sequence) 1/640, F4, ISO.400, 478 mm

Posing birds (most are staring at the photographer)
Rivolis hummingbird 1/320, F4.5, ISO.500, 600 mm

Fiery-throated hummingbird 1/320, F4.5, ISO.500, 576 mm

Jacobin hummingbird, female 1/80, F4.5, ISO.1600, 800 mm

Crimson-collared tanager 1/60, F5.6, ISO.8000, 790 mm

Resplendent quetzal, female (shorter tail feathers) 1/1250, F6.3, ISO.4000, 750 mm

Social flycatcher 1/320, F5.6, ISO.3200, 1000 mm

Boat-billed heron. The beak resembles the bottom of a boat 1/400, F4.5, ISO.3200, 670 mm

Bittern. In the bushes before take-off 1/1000, F5.6, ISO.800, 1000 mm

Snail kite, before take-off 1/640, F6.3, ISO.1600, 1000 mm

Central American pygmy owl 1/1000, F5.6, ISO.1000, 1000 mm

Golden-headed tanager with fruit 1/1000, F6.3, ISO.5000, 1000 mm

Shining honey-creeper 1/500, F5.6, ISO.3200, 1000 mm

Slate-headed tody-flycatcher 1/320, F6.3, ISO.5000, 750 mm

Carrasow, female 1/1250, F2.8, ISO.250, 264 mm

Resplendent quetzal. Left: female, Right: male. These images were taken on 2 successive days. Left: 1/5000, F6.3, ISO 16000, 750 mm. Right: 1/320, F4.5, ISO1600, 512mm

Red-legged honeycreeper (male) 1/640, F5.6, ISO.4000, 1000 mm

Red-legged honey creeper (female) 1/125, F6.3, ISO.1250, 1120 mm

Blue dacnis, female 1/60, F7.1, ISO.500, 980 mm

Blue dacnis, male 1/80, F6.3, ISO.1250, 1058 mm

Amazon kingfisher. Many kingfishers had wet feathers due to repeated diving. This particular bird was somewhat dry. 1/640, F5.6, ISO.3200, 1000 mm

Caracaras in a distant tree during rain showers 1/6400, F8, ISO.12800, 1400 mm

3-toed sloth with lots of green organic growth (likely algae) in the fur 1/800, F5.6, ISO.6400, 376 mm

Scarlet-rumped tanager, female 1/500, F4.5, ISO.250, 800 mm

Scarlet-rumped tanager, male 1/25, F8.0, ISO.80, 1120 mm

Summer tanager in a typical pose 1/800, F5.6, ISO.6400, 1000 mm

Olive-throated parakeet, tho the PictureNature app identified it as Rose-faced parrot 1/60, F6.3, ISO.800, 560 mm

Landing to join colleagues
1/12800, F2.8, ISO.3200, 134 mm

Hoffmans Woodpecker (female) 1/1000, F6.3, ISO5000, 1000 mm

Black-cheeked woodpecker (male) 1/800, F6.3, ISO.1000, 1120 mm
