Author: DMcA

  • Costa Rica: A Toucan
    Takes Flight at Tirimbina

    Sarapiquí is an area of Caribbean-slope lowland rainforest centred on the Sarapiquí River, north of San José. Tirimbina Lodge and its forest reserve span the river and is about 80 km from the city by road via Route 126, with a driving time of roughly two hours and twenty minutes. Its value for a photographer is not just the wildlife in one reserve, but the number of very different places within reach of each other. During my stay, I visited Tirimbina and La Selva for forest walks, Dave and Dave’s for hummingbirds, Pierella and Cope’s for smaller gardens and local wildlife, and Centro Manú for frogs after dark. There are other sites I did not get to. I stayed four days in the area, had some great experiences and got some great shots, and I’m pretty sure there was more to see and experience.

    Tirimbina is probably the most famous lodge and reserve in the area. It has its own rainforest reserve across the river, reached by a 262-metre suspension bridge. The crossing is an experience and the forest is full of birds, but my early-morning guided walk was the least productive of these visits for bird photography. At the end, the guide gave me a list of 33 species we had seen, but I had only a handful of photographs I was pleased with.

    This is the difference between bird spotting and bird photography. A bird spotter can identify a distant bird in the canopy, tick it off a list and be completely satisfied. A bird photographer has very different requirements: the subject must be much closer, with enough light, a clear view and, ideally, an interesting wing position. Tirimbina’s dense forest seldom gave me that combination, and its guides are more oriented towards bird spotters and much less aware of the needs of photographers.

    The exception, and by far my best photograph from Tirimbina, was made outside the lodge on the main road. A Yellow-throated Toucan appeared at a cavity in a tree where the roadside gave me light and an open view of its flight path. I kept the camera on the cavity as it leaned out and launched. Twelve photographs follow it from the tree into flight, each showing a different balance of body and wings. The album also includes parakeets at balsa pods, a Tiger-Heron, a motmot and a White-necked Jacobin hummingbird at its nest, the only time I saw nesting hummingbirds in the entire trip.

    Touch or click any image to go to a lightbox view and then touch the full screen icon in the top right-hand corner to get the best viewing experience. For information on the shot and the location, be sure to click the little ‘i’ icon. And finally click the “heart” icon for photos you particularly like – this helps me understand which photos are more popular

  • Costa Rica: Wings and
    Waterfalls at La Paz
    and Cinchona

    La Paz Waterfall Gardens is an easy 90-minute drive from San José and an attractive first stop on the road to Sarapiquí. It brings several parts of Costa Rica together in one place: a large butterfly house, hummingbirds, forest and five waterfalls. After the butterflies and hummingbirds, you can take a longish walk downhill past the falls and then take a bus back to the entrance, which is a remarkably civilised arrangement.

    I went there at the beginning of the trip, before I knew quite how many hummingbirds I would encounter farther north. The La Paz hummingbirds are clustered around feeders, which makes for a less authentic picture than some of the very natural locations in other parts of Costa Rica, but it was an excellent way of getting used to photographing this iconic bird family. To get these and the butterfly shots, I used the 50–200 mm f/2.8 lens with the OM-1 Mark II in pre-capture mode at around 1/4,000 s.

    The butterfly house has some magnificent species. A Blue Morpho looks brown with its wings closed, while its upper wings show brilliant blue in flight. Capturing that colour meant following its irregular route and timing the exposure for the moment the wings opened. Photographing butterflies in flight, particularly these ones, is significantly more difficult than photographing birds in flight because their flight is extraordinarily erratic and fast. Their overall speed isn’t that high, but they change direction repeatedly at subsecond intervals. In the end, I got the hang of the process, thanks to the great manoeuvrability of the OM camera and lens.

    Just up the road from La Paz was the well-known Cinchona Café, which has feeders and fruit hanging above a dramatic valley. It has some interesting birds, but in a setting that does not look very natural. It’s worth a stop if you are looking for lunch, but I wouldn’t describe it as a destination for the bird photographer.

    The album begins with the more arresting bird photographs, moves into butterflies—including the Blue Morphos—and ends with three views of the La Paz waterfalls. That order reflects the journey out of San José and up towards the Caribbean lowlands.

    Touch or click any image to go to a lightbox view and then touch the full screen icon in the top right-hand corner to get the best viewing experience. For information on the shot and the location, be sure to click the little ‘i’ icon. And finally click the “heart” icon for photos you particularly like – this helps me understand which photos are more popular

  • Cape Town – Telephoto Landscapes

    Regular viewers of this site will know I’ve become interested in using long focal lengths for landscape photography, initially in Moravian Tuscany in Czechia (here and here), and subsequently in the tea plantations of Sri Lanka.



    The technique involves using a telephoto lens, typically 100–400mm full-frame equivalent (FFE), to get an interesting perspective of the landscape from a distance. The attraction lies in both the perspective compression the lens provides and the interplay of light and shade across the folds in the landscape — quite a different approach from conventional wide-angle landscape photography, and one that produces markedly different results.



    Wherever I travel, I now look for landscape vistas that might lend themselves to this approach. A trip to Cape Town in December 2025 seemed a promising opportunity. The long vistas across the Table Mountain range felt like natural candidates, and this album shows the results.



    All but two of these photographs were taken with the OM-1 Mk II and the 50-200mm (100–400mm FFE) f/2.8 lens, with a mixture of tripod and handheld shots.



    Beyond the physical technique, the approach depends heavily on light and shade across the landscape, and I wasn’t particularly lucky in that respect. The best shots tend to come when shooting against the light, which wasn’t possible given my timing. I think there are better photographs to be had in Cape Town using this method, and I may well have another crack at it later this year.


    Touch or click any image to go to a lightbox view and then touch the full screen icon in the top right-hand corner to get the best viewing experience. For information on the shot and the location, be sure to click the little ‘i’ icon. And finally click the “heart” icon for photos you particularly like – this helps me understand which photos are more popular

  • EVF resolution – the missing metric

    Raw EVF megapixels, compared across cameras with different sensor sizes, tells you almost nothing useful about viewfinder quality. Linear resolution ratio is the correct metric: on that measure the OM-1’s 5.76MP EVF on its 20MP sensor achieves 54%, the second-highest in a comparison of eleven cameras, while the Sony A7CR’s 9.44MP EVF paired with its 61MP sensor achieves just 20%.

  • Giant OM1 I and II spreadsheets of my top photo settings

    The OM System settings backup file is unreadable and can only be restored to the same camera model — so when I moved from the OM-1 Mk I to the Mk II, transferring settings meant going through every menu item manually. These spreadsheets, built on BobCS’s 2022 framework and updated by reader MM with full User Guide page references, are the only structured templates on the internet that mirror the complete OM-1 menu system.

  • Sony Zooms vs the 600mm f4 Prime—comparative image quality

    Using standardised test data from The-Digital-Picture — the only widely available source with controlled lab comparisons of both the 600mm f4 GMaster and the wildlife zooms — the £12,000 prime shows minimal perceptible image quality advantage over the £1,600 200-600mm or the £2,400 400-800mm at 600mm. Independent numerical resolution data comparing exotic primes to wildlife zooms essentially does not exist, because manufacturers provide early samples to YouTube influencers rather than to test houses that might measure the difference.

  • OM and Sony wildlife zooms – lens handling

    The rotational inertia index for the Sony 400-800mm is 3.2 times higher than for the OM 50-200mm f2.8 without its tripod collar, which translates directly into how hard each lens is to swing when tracking a fast-moving bird. Neither Sony zoom has a focus preset function, and the Sony 400-800mm’s minimum focus distance of 350cm makes close subjects impractical; the OM 50-200mm with MC20 focuses to 78cm and delivers 2:1 FFE macro capability.

  • Dynamic Range and low-light noise – Sony vs OM zooms

    At true ISO 3200, DxO data shows the Sony full-frame sensor has approximately a 1-stop dynamic range advantage over the OM Micro Four Thirds sensor — but the OM pro zoom lenses are 1.3 to 1.7 stops faster than the Sony wildlife zooms at equivalent focal lengths, which cancels or exceeds that advantage. The Sony 200-600mm suffers a further penalty at 800mm: it must be cropped to reach that focal length, reducing the active sensor area to approximately APS-C size and eliminating both the resolution and full-frame dynamic range advantages simultaneously.

  • Resolution of OM vs Sony wildlife zooms

    Using Visual Extinction (MTF0) testing on a 4x ISO 12233 chart at 18 metres, the OM 50-200mm f2.8 with MC20 at 800mm FFE resolves 23 LPI — matching the OM 150-400mm and out-resolving the Sony 200-600mm at 21 LPI when that lens is cropped to reach 800mm. The OM 50-200mm with MC20 at 800mm loses only one LPI unit compared to the bare lens at 300mm, confirming that the 2x teleconverter is not meaningfully degrading resolution.

  • OM vs Sony zooms: focus accuracy shootout

    Across nearly 11,000 shots on Red Kites at Gigrin Farm, the OM 50-200mm f2.8 + MC20 achieved 93% focus accuracy and the OM 150-400mm achieved 92% — both ahead of the Sony 200-600mm at 90%. The Sony 400-800mm scored 98% but from only 808 shots, because at 2.5kg it was impossible to hand-hold for extended periods; the OM 50-200mm, weighing 1.2kg without its tripod collar, generated more than 2,700 analysable shots in the same session.

  • Using FastRawViewer to cull thousands of images

    FastRawViewer renders true RAW data rather than the embedded JPEG preview, pages through files at near-JPEG speed on a fast SSD, and has keyboard-driven colour labelling that makes it practical to work through tens of thousands of files without importing them into a DAM. At 50fps, one minute of shooting generates 3,000 images; the fine detail view via the Q key is the most reliable tool I have found for checking eye focus on birds during culling.