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Objective focus and eyepiece focus.Help!!

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Old Wednesday 7th May 2014, 20:08   #1
sir_robin
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Question Objective focus and eyepiece focus.Help!!

Sirs,
i bought a Bushnell 36x52 for personal use(pic below) and I don't know why there exists two focus:Objective focus and eye piece focus. I thought Objective focus is to zoom and then find the right focus with eye piece zoom.But it doesn't seem to be working in this way.Anyone with a similar model know what to do?

http://i00.i.aliimg.com/wsphoto/v1/1...pg_350x350.jpg

Last edited by sir_robin : Wednesday 7th May 2014 at 20:54.
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Old Wednesday 7th May 2014, 21:00   #2
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It certainly isn't a Bushnell!

Lots of comments in these Amazon reviews http://www.amazon.co.uk/product-reviews/B00GMWR134
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Old Wednesday 7th May 2014, 22:15   #3
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Hi, I bought a similar monocular secondhand from a local website. It looks exactly the same, and has "Bushnell 16x52 66m/8000m" written on it, which is pretty meaningless. By the objective focusser, it says "Day and Night 18 degrees". I think the mag is about 12x, really, and the objective lens is about 42mm. There was a box with it, that also bore the Bushnell logo. On amazon, thereīs an identical monocular bearing the name "Daditong" rather than Bushnell, but with a similar box. Mine came with a nylon case. The two focussing rings had me confused, too...they both seem to focus normally, so Iīve no idea why there are two, although an advantage is that you can choose to focus with one or other hand. Thereīs no zoom though. Does your one really magnify to 36x?
The surprising thing is that the optics and build are pretty good, easily sufficient for my purposes, which was as a handy monocular for walking with the kids or the dog. I had it at the Cliffs of Moher two weeks ago, and because I couldnīt angle my Nikon ED50 downwards to the stacks below, the little monocular was fantastic hand-held for lying on the grass at the clifftops and looking down at the nesting puffins; very bright and clear in the sweet spot. The kids loved it.

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Old Thursday 8th May 2014, 06:00   #4
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Quote:
Originally Posted by Mono View Post
It certainly isn't a Bushnell!

Lots of comments in these Amazon reviews http://www.amazon.co.uk/product-reviews/B00GMWR134
Thanks sir,saw this a bit too late

Quote:
Originally Posted by Sancho View Post
Hi, I bought a similar monocular secondhand from a local website. It looks exactly the same, and has "Bushnell 16x52 66m/8000m" written on it, which is pretty meaningless. By the objective focusser, it says "Day and Night 18 degrees". I think the mag is about 12x, really, and the objective lens is about 42mm. There was a box with it, that also bore the Bushnell logo. On amazon, thereīs an identical monocular bearing the name "Daditong" rather than Bushnell, but with a similar box. Mine came with a nylon case. The two focussing rings had me confused, too...they both seem to focus normally, so Iīve no idea why there are two, although an advantage is that you can choose to focus with one or other hand. Thereīs no zoom though. Does your one really magnify to 36x?
The surprising thing is that the optics and build are pretty good, easily sufficient for my purposes, which was as a handy monocular for walking with the kids or the dog. I had it at the Cliffs of Moher two weeks ago, and because I couldnīt angle my Nikon ED50 downwards to the stacks below, the little monocular was fantastic hand-held for lying on the grass at the clifftops and looking down at the nesting puffins; very bright and clear in the sweet spot. The kids loved it.
I agree Sancho, the optics is great and focus and clarity is good as well.But it cannot zoom,definitely not 36X.It is comparable to by camera which can do 12x but with more clarity.I thought something was wrong with mine.I think it is a fixed focus with two zoom rings and nothing changes which ever one you use.
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Old Thursday 8th May 2014, 16:50   #5
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Scratch that. I just took mine (my sonīs, really) out to test it and itīs actually about 9x. Although in normal viewing it appeared pretty good, I looked at some tree branches against a grey sky and I donīt think Iīve ever seen CA quite as bad. Also the "sweet spot" is tiny. I wonder if I this one suffered a knock since using it last - very odd. Still okay as a cheap handy monocular, though.
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Old Thursday 15th May 2014, 17:07   #6
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two rings for focusing

Quote:
Originally Posted by sir_robin View Post
Sirs,
i bought a Bushnell 36x52 for personal use(pic below) and I don't know why there exists two focus:Objective focus and eye piece focus. I thought Objective focus is to zoom and then find the right focus with eye piece zoom.But it doesn't seem to be working in this way.Anyone with a similar model know what to do?

http://i00.i.aliimg.com/wsphoto/v1/1...pg_350x350.jpg
I have found that many monoculars are half a binocular and it is cheaper for the factory to use existing parts so the eyepiece focus is what would be the dioptre adjustment on a binocular. If left in the middle position it can be ignored and the focus can be set by using the front lens ring.
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Old Friday 16th May 2014, 18:29   #7
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Originally Posted by richard866945 View Post
I have found that many monoculars are half a binocular and it is cheaper for the factory to use existing parts so the eyepiece focus is what would be the dioptre adjustment on a binocular. If left in the middle position it can be ignored and the focus can be set by using the front lens ring.
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Old Friday 16th May 2014, 18:49   #8
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When I was a kid, more dials and knobs was cool.
Making one of the focus rings in Sanscrit would be super-cool ;-)
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