Thank you all for your very kind comments.
Øivind remarked on the fact that I was using a TC-14 iii on the 300 mm PF.
That combination does work extremely well and provides a very useful lens for quick hand-held use.
I even use a TC-20 iii on occasion to provide a very small fast-focussing 600 mm lens. If I stop-down by just a single stop, the quality is remarkably good and it can make the differenece between getting the shot or not. The next series was shot with the the 300mm + TC-14 combination.
Squirrel Monkeys:![](http://nikongear.net/revival/gallery/0/1358-220318064016-4531681.jpeg)
The tiny Grey Crowned Central American Squirrel Monkey (Saimiri oerstedii citrinellus) is found only in a very small area on the southern Pacific coast of Costa Rica around Manuel Antonio. Because of de-forestation, and also the pet trade, these beautiful little animals were headed towards extinction and were listed as being "Critically Endangered".
1,600 acres in the area are now a protected National Park; local residents have been planting trees extensively; and the monkeys are slowly recovering in number.
Juan and I arrived in Manuel Antonio in the evening and the next photograph shows one of these little Titi monkeys (as they are known locally) on the utility wires in the middle of the town on its way to it sleeping perch in the neighbouring forest.
![](http://nikongear.net/revival/gallery/0/1358-220318064014-452993.jpeg)
The following morning we set off to explore roads less travelled and had the extraordinary good fortune to spot a large troop of these very small monkeys (only about 25 cms between nose and base of tail but with a very long non-prehensile tail) moving through the forest canopy in search of breakfast. They are omnivorous so will eat fruits and small animals.
We leapt out of the car and noticed that the Squirrel Monkeys were moving through the forest parallel with the road but crossing the road in a certain place. I anchored myself under that spot and was able to get a number of photographs although the high contrast of the bright sky, the sun shining through the leaves in patches and the deep shade of the forest made exposure rather tricky.
![](http://nikongear.net/revival/gallery/0/1358-220318064017-4542161.jpeg)
Locking focus on them as they leapt from branch to branch was also quite a challenge.
![](http://nikongear.net/revival/gallery/0/1358-220318064018-455130.jpeg)
Their long fluffy tails cannot grip onto anything but do provide a useful balance and rudder as they leap though the canopy at speed.
![](http://nikongear.net/revival/gallery/0/1358-220318064020-4561019.jpeg)
![](http://nikongear.net/revival/gallery/0/1358-220318064021-4572320.jpeg)
![](http://nikongear.net/revival/gallery/0/1358-220318064023-4581950.jpeg)
A baby who was trying to keep up!![](http://nikongear.net/revival/gallery/0/1358-220318064025-460844.jpeg)
![](http://nikongear.net/revival/gallery/0/1358-220318064026-4612345.jpeg)
![](http://nikongear.net/revival/gallery/0/1358-220318064029-462129.jpeg)