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Pentax binoculars hard to focus in cold weather

Hard to focus when cold

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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

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10year old pentax 8x24 PCF G very stiff focus


you cold try lubing it with the drip down method, squirt penetrating oil in the focus rack and hold so it flows into rack. They used a thick grease for damping, you may try heating it in an oven up to 130F for 5 minutes (or leave in a hot car) to soften grease and then actuating the focus to get the hardened grease back into the helix.

Dec 07, 2012 | Pentax Optics

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The ridged dial on top of the binoculars does not focus anymore. A child was flipping it back and forth rapidly and something 'gave'


Somebody, Please give us suggestions and solutions to this problem... this is the very same problem with my 10x24UCF WR Pentax Binocular. I'm Jun Galvez from Philippines, Email add: mimo_369423@yahoo.com

Jan 27, 2011 | Pentax UCF WR Binocular

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Stiff focus wheel


The number one rule is to never use oil on a binocular!!
I suspect that the multistart thread on the focus arm carrier, which is internal, has become gunged up. This is not an easy repair for a beginner. The rubber has to be removed from the body of the binocular before you can even start to take them apart to determine the fault.
Like any bearing or gear system, the part would have to be cleaned with a degreaser, then reassembled with new lubricant.

Jan 04, 2010 | Pentax PCF WP II (8x40) Binocular

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I bought these for my husband. In trying them


Difficult to answer specifically without knowing the model. But binoculars are designed to view objects in the distance. They all have a limit as to how close they will focus based on the magnification and design. Objective lenses that are far apart such as on a porro prism binocular will not focus very close. The nature of the design of having the objectives further apart than the eyepieces doesn't allow it. When trying to focus too close the image will appear blurred and double. That is the nature of the design. 9 feet or 3 metres is considered quite close to focus a binocular and is usually for a model designed to do this such as a roof prism where the objective lens and the eye lenses are inline. A specialty binocular such as the Pentax Papilo will close focus to 50 centimeters. It has been designed so that the objective (large lenses) lenses converge.

Take into account when focusing that binoculars are also designed to compensate for differences in each eye. One of the eyepieces either right or left will adjust seperately. For binoculars with a center focus ring. First focus using the center ring with one eye covered. The eye that should be covered is the one that doesn't have the adjusting eyepiece. When the image is clear close the eye you have just used and leave the center focus alone. Focusing on the same spot look through the eyepiece that adjusts and turn the eyepiece ring until the image is clear. Now all you have to do is focus using the center ring only as the binoculars are adjusted for each eye.

Some binoculars do not have a center focus and each eye will adjust seperately.

Jul 29, 2009 | Optics

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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

Binoculars to see computer screen


Try the Pentax Papilio 6X 21mm binocular. It focuses down to 18 inches, is about $129 online and has a great compensation factor to allow you to see normal stereo at close focus by moving the objectives automatically as you focus. Other binoculars do not do this so that you end up having to look thru 1 or the other eyepiece but not both. I have 2 pair I like them so much.

Oct 17, 2007 | Fujinon HS Binocular

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