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Very odd Pentax 7x35 PCF

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/09/2006 at 22:12
Brokenear View Drop Down
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I recently purchase a pre-owned Asahi Pentax 7x35 PCF binocular. I wanted something decent to keep in my truck, but didn't want to leave my Nikon SE in it all the time. When I received the Pentax I checked for scratches and collimation and put them behind the rear seat. When I was messing with them today I noticed something odd. The image through the left barrel has a definate bluish tint and the right barrel has a yellow tint. When you look through them with both eyes the colors blend and everything looks normal. The coating on the lenses is the same color.

I have looked through many binoculars and have never seen anything like this.

 

Any ideas?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/10/2006 at 10:34
anweis View Drop Down
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i've noticed that with several binoculars, including Zeiss.

If you turn the binoculars upside down and look, you will notice that the color bias is not in the binoculars, but in the eyes. (the barrel that is on the right is still the yellowish one)

I have no explanation for that. 

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/10/2006 at 11:02
mwyates View Drop Down
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That could very well be your eyes aging.  I had early cataracts due to a lot of x-ray exposure and had implants at 43 years old.  The change in my color vision was dramatic.  I had no idea how much of a yellow tint that everything had before.  If you're under 40 this probably isn't the case, but if you turn the binos upside down and the colors switch sides, it's your eyes.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/10/2006 at 19:10
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Optics GrassHopper
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Well, son-of-a-gun! You are both correct. I never thought of that. I compared it to my Nikon 8x32SE

and I didn't see the problem in the Nikons. I checked the Pentax again today and sure enough, the

left side has a blue tint and the right side is yellow although it is much less pronounced then yesterday.

I turned them over and saw the same thing. It was overcast yesterday. That may have had something

to do with the coloration. It is bright and sunny today and the difference is much less noticable.

 

By-the-way, I am 64 and I do have cataracts. I can't shoot with aperature rear sights anymore because

I see a fuzz ball in the center.

 

Thanks for the quick reply and the good info.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/11/2006 at 10:22
mwyates View Drop Down
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Glad to help, and welcome to OT.  I really hadn't thought about cataracts until I read anweis' post.

 

Two heads are better than one

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/14/2006 at 00:22
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Here's something that was suggested by Hans Seeger on the Deutsche Optik forum.

 

"Mr. Leinhos described a very simple test for comparison of binos (light transmission, colours etc.): Put a white piece of paper on the table and hold the binos the wrong way about 10 to 20 cm over the paper. Look into the objective glasses (ocular to the paper). Then you can easily compare the glasses."

 

I tried it and I can't see any difference from one side to the other. It is definately my eyes that are the problem.

Getting old isn't for sissies.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/14/2006 at 09:13
mwyates View Drop Down
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Getting old isn't for sissies.

 

You got that right.  The only thing worse is the alternative, and I can see how old folks get ready to go HOME 

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