They do indeed exist. I somehow ended up with 2 of these. One is a
Cambron, which many of you have likely never heard of. It is a store
brand for a big NY camera store. I also have a Vivitar TLA-1 Telescope
lens adapter and the Cambron is absolutely identical, obviously from the
same source. Vivitar has never been a manufacturer, they select and
brand items from many actual manufacturers.
The ones I have use 3 fully coated elements and a roof prism. They
simply mount on the back of the lens like a big rear cap with an
eyepiece sticking out. Focusing is done with the lens helicoid. The
image is right side up and nice and clear and bright. I've never really
checked the angle of view, but it is not 'looking down a long tunnel'
like cheap telescopes. These things aren't designed to compete with
serious scopes, but to offer a small, light way to use a camera lens
already on hand as a scope in the field.
They are not designed to work with lenses less than 50mm and
magnification is fl/10, so a 50mm lens gives 5x. The instructions show
rations for 50, 100 and 200mm lenses, but just as with binoculars,
holding anything over 10x steady is not easy for long. The 85/2 is a
good match, a nice bright 8.5x scope. It seems to me a good design
choice, as one can get to the limit of hand holdability with relatively
small, light, fast lenses. I doubt they would work all that well with a
400mm lens, as the instructions make it clear they are designed for
50-200mm lenses.
If anyone is interested, I'd be happy to sell the extra. EX++ condition
$33 plus shipping. Pics available. Ofline response please.
Moose
afildes@xxxxxxxxxxxxxx wrote:
>They exist - usually called telescopic adaptors or something like that
>because they don't really have a proper name. I had a Sicor one that
>approx. doubled the focal length and was quite cheap but not terrific
>quality - but good fun for a while. Easiest way is to buy one in any
>mount that you can find and mount it on a cheap T mount 400/6.3 with a
>T mount adaptor. That makes a pretty decent and cheap terrestrial
>scope as even a cheap black drainpipe such as a Tamron, Sigma,
>Spiratone, etc. has fair optics compared with most consumer telescopes.
>AndrewF
>
>
>On 17/05/2004, at 6:19 PM, Gareth.J.Martin wrote:
>
>
>
>>Dear All,
>> I've had my OM-1n for 7 years now. Originally I first got my
>>hands on one in 1995 at an astronomy show in London where I was asking
>>for advice on astrophotography. The person on the stall was really
>>helpful and full of zeal about the OM series. He showed me a lot of
>>accessories, one which, when attached to a telephoto or zoom Zuiko
>>converted it into a spotting scope. Naturally I was over the moon about
>>this (no pun intended!) however I have never seen or heard anything
>>about such an adapter since. Does such an adapter actually exist or is
>>my memory play silly beggars with me? If so where could I find one and
>>what is the quality of them like? I'd just like to be put out of my
>>misery by at least knowing they exist!!! Thanks!
>>
>>All the best,
>>Gareth.
>>
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