Focus adjustment for HAL 220

Frequently asked questions about focus adjustment for the Entaniya Fisheye HAL 220 series (PL / LF), possible problems, and how to focus more easily are explained.

How to adjust focus

Check the video for basic focus adjustments for HAL 220.

Focus adjustment procedures

Focus adjustment is made by rotating the Lens Frame, which is held in place by a Fixing Screw inserted in the red part to fix the focus when the lens is in use.

To rotate the lens frame, you need to loosen the screws inserted in the red part.
There are six screws in total, so loosen all of them. It is not necessary to remove the screws. Simply loosening them is sufficient.

Loosen the screw, and you will be able to rotate the gray lens frame on the front part of the lens.
If you hold the aperture gear while rotating the lens, the aperture gear will rotate, so hold the silver mount (actually fixed to the camera) while rotating the lens frame.

Rotate the lens frame to adjust the focus. With the camera toward your body, rotate the lens frame “clockwise” to focus farther away. Rotate the lens frame “counterclockwise” to focus closer.

Frequently Asked Questions and Focus Adjustment Tips

Cannot focus by turning the lens frame?

If the image remains out of focus even after rotating the lens frame, the lens frame may not be rotated enough.

The HAL 220 series requires the lens frame to be rotated many times if the focus point is far away. For example, in the case of the HAL 220 LF, if a zoom spacer ring is inserted in a lens that has been used at the maximum focal length of 12.6 mm and is used at the minimum focal length of 9.1 mm, the lens frame must be rotated counterclockwise more than 10 turns to bring it into focus.

If the focus point is far away and the image is largely blurred, it may seem as if the camera cannot focus, because even if the lens frame is rotated several times, little change is seen in the image.

When changing from the minimum focal length to the maximum focal length, it is necessary to rotate the lens frame about 13 to 14 rotations to bring it into focus.
Conversely, if you rotate the lens frame 10 rotations and get no change in the image, something else may be wrong.

What can be determined by the appearance of the lens

Whether the focus point is far away or not can be inferred to some extent from the appearance of the lens.

When focused, the length of the lens mount (silver part) will differ depending on the focal length.

If the focal length is short, the mount will be shortened.
If the focal length is long, the mount will be long.

In other words, if the focal length is shortened but the mount is long, it can be determined that the lens is far from the focus point. The vice versa is also true.

Note that turning the lens frame “clockwise” with the camera toward the body lengthens the mount while turning it “counterclockwise” shortens it.

Use a focus chart

When adjusting focus, if it is difficult to judge whether the focus is correct by visual inspection alone, a focus chart can be used to make the decision easier.

When using a focus chart, place it at least 2 meters away from the lens.
If the focus chart is placed close to the camera for focusing, the camera will focus only on the area close to the camera, and infinity may not be obtained.

Focusing from a stopped down

Focusing with the aperture stopped down (T16 or T22) provides a deeper depth of field, making it easier to focus. Once in focus, open the aperture to T5.6 or T8. The depth of field becomes shallower, so focus again. A final adjustment at T2.9 will allow you to focus more precisely.


When using HAL 220 PL with a focal length of 7 mm or less

When using HAL 220 PL with a focal length of 7 mm or less, focusing may not be possible with some cameras.

The Entaniya Fisheye HAL 220 series lenses are designed with the rear of the lens protruding, and the shorter the focal length, the greater the amount of protrusion.

Therefore, when used with a focal length of 7 mm or less, the rear of the lens may interfere with the internal frame of the camera or with the filter, making it impossible to focus.

No problem when used with a focal length of 7 mm or greater or with HAL 220 LF.

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