The Nettel Kamerawerk Sonnet Tropen (Tropical) in 4.5x6cm format is an early 20th-century German folding plate camera built in a tropical specification, typically using teak or other hardwood with brass fittings rather than the leather-covered metal of standard models. Nettel Kamerawerk produced cameras in Sontheim before merging with Contessa in 1919 to form Contessa-Nettel, placing this Sonnet Tropen firmly in the pre-merger era.

Auction data for this specific 4.5x6 Sonnet Tropen is extremely thin: the only recorded UK saleroom hammer result on file dates to 2004 at £573, so any current value estimate carries significant uncertainty. As of 2026, comparable small-format tropical folders generally sell for and are worth meaningfully more than that two-decade-old figure when offered with original wood and bellows intact, but without recent hammer prices we cannot quote a reliable current range or median price for what one sells for today.