Type 120 Vlads Test Target

How to Use Type 120 Targets:

Before starting your digitizing session, place the Type 120 film strip or slide into the film holder. The strip is 61 mm wide and includes both 6×7 and 6×9 frames. For panoramic setups, you may use both frames together.

Capture the images and review them on a computer screen to confirm the following:

• Critical focus is achieved: The center, edges, and corners of the frame should all appear equally sharp.

• Resolution is consistent: Each USAF 1951 pattern across the frame should resolve the same Group and Element.

• Siemens stars are uniform: They should appear equally sharp across the frame, with clearly defined lines.

• Fine raster is crisp: The uniform raster pattern throughout the image area helps verify even sharpness and alignment.

• Full alignment between the camera and film holder is achieved. This ensures that all elements of the target come into focus simultaneously, with no geometric distortion—right angles remain true, and there’s no tilt or skew.

• The optimal f-stop is set for maximum sharpness. For example, the APO Rodagon lens performs best at a very specific aperture, such as f/5.6½. Even one stop  deviations from this value can noticeably reduce image quality.

• Correct framing is established. Depending on the coverage you want, frame the image to match the film size. For borderless capture, use approximately 56×70 mm for 6×7 and 56×84 mm for 6×9. Built-in markers inside the target help guide precise framing. 

These targets are designed to help you troubleshoot and fine-tune any of the above aspects as needed.

Note: The absolute resolution of the Type 120 and 4×5″ targets is 43 line pairs per millimeter.