Climate changes shift wintering ranges of waterbirds

Tufted Duck - Photo: Nigel Picknell

Migratory waterbirds have shifted their wintering areas north-eastwards due to climate change in Europe, according to a group of scientists including Richard Hearn of the Wildfowl & Wetlands Trust (WWT).

Their new study published in Global Change Biology found a strong link between changes in the numbers of goldeneyes, tufted ducks and goosanders wintering across northern Europe and changes in temperature in early winter.

In Finland and Sweden, the mid-winter numbers of these three species are more than 130,000 individuals higher than three decades ago. Correspondingly, on

Ltl Acorn 5210 and 6210 Close Focus Adjustments

Fig 1:   Lens assembly sitting over the image
sensor on the main camera board.

Following on from last month's posts about close focusing, the following shows how to make the adjustments to the lens to achieve various ranges of closer focus with the Ltl Acorn 5210 and 6210 cameras.

Please be aware that if you mark or damage the camera when carrying out the following procedure it may affect or negate your right to claim under warranty; so you do this at your own risk.

To access the lens assembly you will need to remove the six screws from the back of the camera. This will release the camera front which can then be lifted away to expose the lens and IR filter assemblies.

Warning: There is a small sealing washer located internally in the pillar at the back of each case screw. They may become dislodged when the camera case front is removed. Do not lose them and make certain they are relocated before the case front is refitted otherwise water may gain entry past the case screws.

The IR filter assembly is actuated by a servo and can be manually moved back and forth across the lense to position it out of the way; but be careful not to knock or damage it while using the pliers to shift the lens.

Both camera models are basically the same except for the focal length of the lens. The 5210 models