The Rollei Rolleiflex 3.5F Model 3 with a 75mm F3.5 Planar lens is indeed a highly sought-after and collectible camera in the world of vintage photography equipment for various reasons:

Limited Production: The Rollei Rolleiflex 3.5F Model 3 was produced in limited quantities, making it a rare and valuable collectible. The manufacturer, Rollei, released this particular model in a restricted number and only continued its production for a specific period. As a result, this camera model is characterized by a limited production over time, making it rare and highly sought after.

Superior Optics: The Rollei Rolleiflex 3.5F Model 3 is equipped with a high-quality 75mm F3.5 Planar lens. This lens provided superior optical performance for its time. For photographers, this lens allows them to capture high-quality and sharp images. This quality makes the model appealing to collectors.

Historical Significance: The Rollei Rolleiflex 3.5F Model 3 holds a significant place in the history of photography. This model was produced during an important era, such as the 1950s and 1960s, and reflects the aesthetics and technological features of that time. For collectors interested in the history of photography, this model holds value due to its historical significance.

Mechanical Elegance: Rolleiflex cameras are known for their mechanical elegance and durability. The materials and craftsmanship used in the construction of these cameras are of high quality. Therefore, for vintage camera collectors, the Rollei Rolleiflex 3.5F Model 3 is an attractive choice due to its mechanical elegance and durability.

In conclusion, the Rollei Rolleiflex 3.5F Model 3 is considered rare and valuable as a vintage camera due to its limited production, superior optics, historical significance, and mechanical elegance. These qualities lead collectors to seek out this model and view it as a valuable addition to their collection.