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Kendrick Kwik Focus for 140mm to 150mm OD Tubes

Price: $55.00

  • Manufacturer: Kendrick
  • MPN: 2047
  • SKU: 2047
  • Availability: In Stock

With the "Kwik Focus" on the end of your telescope all point source objects will form THREE round images. Turn the focus adjustment in the direction that brings the images closer together. When the images overlap each other and become one, you are focused at the best your lens system is capable of. You will find this is easier as power is increased. You can focus right on a planet or the moon and not have to move back and forth between a bright star and the planets. (As other products on the market require). No doubt, you have seen articles that recommend, under certain conditions, stopping down your telescope for better viewing and to help increase contrast and reduce glare. The cap can be left on to do just this while viewing a bright object like the Moon, which has the added benefit of helping to save your dark adapted eyes. It may also eliminate the need for a neutral density filter. Other benefits of this device include.

"Kwik Focus" may also be used for prime focus on your scope if you want to photograph any nebula. Simply point your camera and scope at the closest sixth magnitude star or brighter near the object of your choice and adjust your focus so all double image star points become single points of light. Take a little extra time here because your star images are very small compared to planet images. When you have finished focusing, do not forget to remove the "Kwik Focus Cap" for maximum light for the camera.

Double star watchers will find "Kwik Focus" helpful in that you will get better resolution of close stars and better colors. The Kwik Focus can also be used as a step down mask to cut down glare when observing the moon. It also acts as an off axis aperture mask. As an aperutre mask the cap can be rotated until the best surfaces of the mirror are beneath the holes in the Kwik Focus cap. Planetary observation is enhanced by the reduction of the effects of nominal seeing, lengthening the focal ratio of your telescope and eliminating the light scattering effect of the secondary mirror

For CCD imaging use the following process for quick and easy focus.


Step 1.

Place the Kwik Focus over the front of your telescope. Set your CCD camera to its coarsest binning, which would be 3 x 3. If you are using the ST7 or ST8 use the 27 micron pixel size. Using a 2nd magnitude or brighter star, start to focus on the star using the softwares focusing mode. An exposure of 0.11 to 0.5 seconds should suffice. Continue adjusting focus until the duplicate star images converge on your monitor.

Step 2.

Set your CCD to its finest binning, which would be 1 x 1 or the 9 micron pixel size for the ST7 or ST8. Using a 4th or 5th magnitude star and the same exposure times as described above, adjust your focus until the images converge again on your monitor.

Step 3.

If you have a digital focus counter, record the focus position for future reference. A digital focus counter is highly recommended for users of Schmidt Cassegrain Telescopes or any other tlescope with an internal focusing mechanism. If your focuser is external then measure the distance from the back-plate of the OTA to an easily accessible spot on the CCD and record this measurement.


Skip step 1.

Using your previously recorded focusing measurements, set your CCD camera in position.

Repeat step 2.

The first time procedure should only take 30 to 60 minutes. All subsequent setups should only take 10 minutes at the most.

How to focus a 35mm camera:

Procedure for 35mm or larger cameras

Place the Kwik Focus over the front of your telescope. With your camera in the focuser look through the view finder and begin to bring the images into focus. You will see multiple (3) images of all objects in the field of view. As you focus the images will tighten up and converge. The point where the images converge is the point of

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