The United Kingdom left the European Union on 31 January 2020, after which it became a 'third country' to the EU (i.e. a country outside the EU).
The EU and the UK reached an agreement on their future relationship on 24 December 2020. They formally signed the EU-UK Trade and Cooperation Agreement on 30 December 2020.
The agreement entered into force on 1 May 2021 after approval of the European Parliament and adoption by the Council.
And yes, Brexit did change VAT (and customs) policy on cameras/lenses between the UK and the Euro zone.
You now have to pay customs as well as import duties (VAT).
For the import of goods, the currently applicable import duties/VAT (in Denmark 25%) is levied on the total purchase price. The shipping and/or insurance costs are added to the value of the goods, if the value of €22 is exceeded. The transaction price of a product is the price actually paid or payable, which is used to calculate the import duties.
In the case of non-commercial goods imports, the shipping costs are not to be included, unless these are included in the customs value of the customs declaration or otherwise declared in writing or verbally.
You can see the current tariffs below.
Go to the EU's "COMBINED NOMENCLATURE" (link):
https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=OJ:L:2021:414:FULL&from=EN
Go e.g. to CN Code 9002 11 00 – – For cameras, projectors or photographic enlargers or reducers - and you will see a "Conventional rate of duty (%)" : 6.7%.
Or go to the EU's "TARIC" below (link):
TARIC Consultation
Enter the code (e.g. 90021100 (no space between the digits!) and select the exporting country (UK). You should get the same result: "Third contry duty ... 6.70%" (don't forget to add the import duties (VAT)!).
So a lens priced €1000 in the UK + €50 for shipping + customs + import VAT will cost around €1400 in the European Union.
This means that the price in the UK must be multiplied by 1.4 to get the price in the EU (Denmark).