Bird identification with Long lens.

If you would like to post, you'll need to register. Note that if you have a BCG store account, you'll need a new, separate account here (we keep the two sites separate for security purposes).

I recently spent some time at Malekele, which is on the border of South Africa, Mozambique and Zimbabwe. Amazing birding country.
However, with a lot of "small brown jobs" seen at a distance identification was a problem.
I am an enthusiastic birder but not an expert birder so I need a birding App and a good close up view to give them a name.
In the end, the only way for me to actually see what the bird looked like was to photograph them.

I used my Nikon D500 with the 200/500mm Lens. I never expected much because the bird was a minute spec on my screen.
Most of the shots were taken with the birds on the top branches of trees silhouetted against a bright African sky.
The lens was at full extension, 500mm x 1,5 =750mm

I was totally flabbergasted by the results.
I attach two variations of the same image taken with the camera hand held ( Tripods are not an option when taking photographs while walking with a group)
The setting was 1/2000 @ f=6,3 and ISO 400. As I am 80 years old and the D500/200-500mm zoom is not light, I use a "Rifle Butt" type 500mI supported my camera on a "Rifle Butt" type support, which I developed and fabricated myself.

When I came to process the image, the subject took up less than 1% of the frame, I cropped it tight to the bird, ran it through Elements 2018 ACR converter and I was stunned by the result.
The image I ended up with was the equivalent of an image taken using a 5000mm lens hand held!! ( I think my arithmetic is correct, you have to double up 6,5 time to get from 1% to 100% )
6,5 x 750mm is approximately 5000mm )

I was able to identify the bird as Arnot's Chat. I attach the original and the cropped images. This was not an isol fluke
_DSC2237.jpg
You can only see EXIF info for this image if you are logged in.
_DSC2237.jpg
You can only see EXIF info for this image if you are logged in.
_DSC2237.jpg
_DSC2237.jpg
You can only see EXIF info for this image if you are logged in.
_DSC2237.jpg
Arnot's chat-Kruger-Maleleke-Nov 2020-2237.jpg
You can only see EXIF info for this image if you are logged in.
 
I have a tree snag about a mile away from my house that is popular with the raptors as a perch. I'm often not able to get an ID from 10X40 binoculars but if I take a picture at 600-840mm and then crop I can usually see enough to get the ID of either Red-tailed Hawk (the most common), Prairie Falcon, Golden Eagle, or Ferruginous Hawk. The shape can be highly diagnostic, but I like a bit more info if possible. I'm getting close to leaving the bins at home and only carrying the camera (used as a scope with 840mm being the equivalent of 16.8 powered bins). Richard Crossley (author of The Crossley Guides) tells a story of how some other birders said he must be getting bored with the birds because he doesn't lift his bins much anymore. His reply: "I only use the bins when I don't know what the bird is." Well, I'm not that good, but I'm getting better.
 
Last edited:
Hi Karl,
I have this eternal debate with myself, will I get a better result by using the 1,4x converter on my 500mm lens or should I just shoot and crop.
Nearly every expert advocates extending the focal length, I am not so sure!
 
Hi Karl,
I have this eternal debate with myself, will I get a better result by using the 1,4x converter on my 500mm lens or should I just shoot and crop.
Nearly every expert advocates extending the focal length, I am not so sure!
Using the TC puts more pixels on the subject...which generally means better IQ...but some of the better is lost to more noise or lens aberrations or other optical things. All in all...I think that final IQ is likely better with TC.
 
Since there are a few variables, it seems like the best way to figure out what combination is the best for a particular setup (body/sensor, lens, TC) would be to test it out and then pixel peep. I "think" the TC would give better IQ when you can't fill the frame with a bird... but I hope to test it out today.
 
Wrong again, Bigger is Better Breath (that's me). Not a double-blind controlled test but I tried my Sony A7Riv with 200-600mm in four different configurations and the results are listed below in order of best to worst (according to MY eyes... and I'm 73 yo, yikes):
1. 600 + crop mode
2. 600
3. 600 + TC
4. 600 + TC + crop mode
1 and 2 were very close, but the TC seemed to make the images slightly softer... but that's with my testing and conditions and eyes.
 
Back
Top