I picked up a Opteka 15mm lens online to use as a lightweight backup lens for Real Estate Photography and also landscapes. Unfortunately the Opteka 15mm f/4 LD UNC AL 1:1 Macro Wide Angle Full Frame Lens comes nowhere near filling the shoes of my Tamron SP 15-30mm VC F/2.8 lens. As such, I can’t rely on the Opteka for any serious work.
Comparison test images below. All shots taken on my tripod mounted full-framed Sony A7R I (using the Fotodiox Pro Canon EF adapter). 2 second delay and manual focus techniques were employed for both shots. Exposure information – ISO 400, F/16. 0.3 second shutter speed with the Tamron and 1/10th second shutter on the Opteka yielded a similar brightness to the frame.
The upper left corners of the Opteka 15mm lens are fairly soft. The upper right corners of the Opteka 15mm are extremely soft. Center sharpness is surprisingly not bad.
See below to reach your own conclusion:
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