The phrase "a narrow depth of" is correct and usable in written English.
It can be used when describing a limited or restricted extent of something, often in a physical or metaphorical context.
Example: "The research focused on a narrow depth of analysis, which limited the overall findings."
Alternatives: "a limited range of" or "a shallow extent of".
It shoots fast, has a decent array of features, captures good detail and colour and can produce photos with a narrow depth of field for pleasing bokeh effects.
The most commonly known of these is probably the iPhone's "portrait mode," which detects the user's face and body and then blurs out the background as if the photo were taken with a narrow depth of field.
While the focusing schlieren setup should have a narrow depth of field and the ability to minimize the plasma glow, the reported images are quite blurry and with an evident overexposure due to the plasma emission.
A relay lens RL then conveys the schlieren beam to camera C. Due to its large light source and aperture, this schlieren system has a narrow depth of focus at S, which is useful in isolating S from other refractive disturbances elsewhere along the optical path.
(Of course a narrow depth of field in a conventionally projected film can have a similar effect, but it isn't as relentless and persistent).
There are various ways to do this: you can photograph from behind or above, cover the child's face with a toy, or use a narrow depth of field to blur out the faces in the background.
3.SynthCam -- An experimental app that recreates a narrow depth-of-field effect.
The Petzval is unique in its design in terms of being intentionally made to capture a super narrow depth-of-field, which is a key ingredient for portrait photos that really pop.
We created four synthetic models (dashed lines in Fig. 6) with 5%% fast anomalies in a narrow depth range of 60 180 km.
We started with a coarse search with a broad depth range (5 40 km), and then a fine search was focused around the minimum misfit value in a narrow depth range of 2-km intervals.
The Petzval lens was the most popular choice for photos in the 19th century, and produces a unique bokeh (background blur) effect with a very narrow depth of field.
