Got an answer to my question on the official Cuban Customs website with information for visitors. Here it is in English:
Cuban Customs Administration Home Page
"If you are visiting Cuba as tourist you will enjoy the benefits established in the Convention on Customs Facilities for Tourism. You will have the right to enter items for your personal use carried in your check-baggage or in your hand-baggage, that there is no reason to consider that these rights are being used in excesive quantities and they will be reexported when leaving the country.
To this effect, personal items are in addition to clothings and other articles that can reasonably be considered of personal use by the tourist, taking into account the circumstances of the trip, and other items according to the type of tourism, such as:
* Photo and video cameras, camping tent, fishing gear, bicycle, sports equipments, laptop computer, equipments for recording and reproducing sounds.
If you are only carrying your personal items and cash not exceeding $5000,00 USD or its equivalent in other currencies, YOU DO NOT NEED TO FILL OUT THE CUSTOMS DECLARATION."
Thanks to Mack and AnnaC for their helpful posts.