Yes, temperature can affect the optical performance of binoculars. Changes in temperature can lead to expansion or contraction of the materials used in the lenses and housing, which may alter the alignment and focus of the optical components. This can result in a temporary change in image quality.
Cooling binoculars may improve image clarity under certain conditions, particularly in reducing heat distortion or shimmer caused by warm air. However, the improvement is usually minimal and highly dependent on the environment and the specific optical design of the binoculars.
Heating binoculars can help eliminate fogging on the lenses, which can occur in humid conditions or when moving from a cold to a warm environment. However, excessive heat can damage the optical coatings or other components, so it should be done cautiously.
Temperature changes can impact the focus of binoculars due to the thermal expansion or contraction of the materials. If the lenses shift due to temperature fluctuations, it may require re-focusing to achieve a clear image. This is usually a temporary issue.
Long-term exposure to extreme temperatures can potentially damage binoculars, affecting their optical alignment and coatings. Consistent temperature fluctuations can lead to misalignment of the lenses and seals, which may compromise the overall durability and performance of the binoculars over time.