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How can I readjust the focusing wheel on a Pentax 8x42 DCF?

My old Pentax 8x42 DCF binoculars have a focusing wheel with 1-turn adjustment range. 3/4 turn is beyond infinity. The remaining 1/4 turn limits minimum focus to about 30'. Is there a way to readjust this so that infinity is within 1/4 turn of the end point?

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Posted on Jan 02, 2017

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SOURCE: right lens on Pentax 10x42 DCF HR 11will not focus at all

pentax # 18008770155....gl larry reich

Posted on Aug 13, 2009

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The locking diopter ring on my Bushnell 8x42 Legend Rainguard HD binoculars doesn't have enough (-0)range to bring subject into focus.


Are you focusing on near or distant objects ? If near, it may not have sufficient close focus travel.

Oct 16, 2016 | Bushnell Optics

1 Answer

I have a pair of pentax 10x42 DCF HRc binoculars that will not focus properly througn the right eyepiece. Just wondering if this is a common problem and is it worhtwhile getting repaired


The binos will rack focus both at the same distance, you need to rack focus left side to distant image with left eye only, then turn diopter focus to focus right eyepiece. Diopter focus is thinner wheel behind focus wheel

Aug 15, 2015 | Pentax DCF HRc (10x42) Binocular

2 Answers

Seeing double when I look with both eyes. Out of


Step 1.
Adjust the eyepiece or both if both are adjustable back to zero. It should be printed on there. If it's not, then halfway. To find halfway turn them to one end, count the number of turns like 1 and a half turns for example, and then half that atnd turn it that ammount. You've now reset the binoculars to zero.

Step 2.
Now to focus. Pick your target that you want to look at thoguh your binoculars. Look through the binoculars and close the eye with the adjustable eyepiece or your right eye if both are eadjustable and focus the image on the left eye with the central focus knob. Once you've got it focused close the left eye, open the right eye and if it's not in focus adjust the EYEPIECE focus, not the central one, until it's in focus.
If you can't get it in focus because the eyepiece focus won't turn far enough in one direction, turn the OTHER eyepiece in the opposite direction at max, start the process again from step 2.

If it's all ok now you need to adjust the distance between the eyepieces. Open the binoculars as far as they go, look through the binoculars with both eyes on the target and move the binoculars inward slowly until you remove any black edges around the image, then move them very slowly inward until you see only one image.

If you've got more problems come back as ask. :-)

Nov 27, 2009 | Vector Audubon 8x42 Binoculars

1 Answer

Diopter out of ajustment


pentax is one of the good guys and has a great serice center. why no send it back and ask for a replacement, if your sure you are focusing properly there should be no problem. larry@reichinstruments.com

Jun 04, 2009 | Pentax DCF SP Binocular

2 Answers

How to focus my Zeiss 10x40B TP binoculars


Your binoculars are known as the Zeiss Classic or what was once known as the Dialyt. They focus differently from the usual binoculars like those mentioned. The rear wheel is to focus both binocular barrels while using them. The front focus wheel is adjust the right eyepiece to suit your right eye. Binocular manufacturers take into account each eye is slightly different. To focus the Dialyt...First close your right eye and turn the rear wheel until the image is sharp in the left barrel. Leave the focus wheel alone. Now close left eye and adjust the front wheel until the image is sharp for your right eye. The image should now be clear and in focus for both eyes. It should not be needed to use the front wheel from now on. The rear wheel is what you will use to change the focus from near to far objects.

May 31, 2009 | Zeiss Classic B/GA 524013 Binocular

1 Answer

Diopter adjustment


Call tech support! That's why these people get paid. Sites like this wouldn't need to exist if they did their jobs correctly!

Mar 11, 2008 | Pentax DCF SP Binocular

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