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#1 |
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i'm sure this has been hashed over before and i'm just too lazy to go looking for the info but, has anyone used one of those old mirror telephoto lenses from 35mm days. most were around 500mm and f/8. if i'm not mistaken, i think they were fixed focus too. anyway, does anyone remember who made the best mirror lens? does anyone remember the mathematics as to figuring real focal length, f/stop, etc. when connecting a camera with it's own lens via an adapter?? would using a mirror lens and also the digital camera's zoom be feasible?? i guess it would be sort of an afocal system without the eyepiece??? if anyone has used this setup has it been successful?? any comments about it??? thanx!!!
dennis |
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#2 | ||
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CK http://www.cs.mtu.edu/~shene/DigiCam Nikon Coolpix 950/990/995/2500/4500 User Guide |
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#3 |
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If you are talking about putting a mirror lens on a SLR (or DSLR) camera, you are in luck. Go to your local library and see if they subscribe to popular photography. In the last month or two they just did an article on mirror lenses.
Eric |
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#4 |
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thanx for the info!!! $30K to $60K+ is just a tad out of my budget. just a tad!!! ha ha ha ha!!!! i remember some russian optics and i do remember the article on mirror lenses. i'll have to find it and read it again. i have a fuji s602z. i was thinking of using a t mount
to 55mm adapter to mount between the lense and my camera. i thought but, wasn't sure, that i could focus via my cameras autofocus mechanism or manual focus and my zoom function. that's why i asked about the mathematics involved in calculating actual focal length. thanx guys!! dennis |
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#5 | ||
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Join Date: Oct 2002
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CK http://www.cs.mtu.edu/~shene/DigiCam Nikon Coolpix 950/990/995/2500/4500 User Guide |
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#6 | |
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Join Date: Jun 2002
Location: 39.18776, -77.311353333333
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http://www.adorama.com/catalog.tpl?o...&sku=SG6008EOS http://www.adorama.com/catalog.tpl?o...&sku=SG6008MAX At theses aperture, the AF in most camera will not work, hence all theses lenses are manual focus only, ie you focus it manually with a ring! I had a 500mm for my older AF SLRs and the nice feature about theses lenses are their defocus detail tend to show up as circles! ![]() For T-Mount ($99): http://www.adorama.com/catalog.tpl?o...XX&promocode=A |
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#7 |
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Shene and others, thanx much for the info. after thinking about it i guess i will need to use an eyepiece.
dennis |
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#8 |
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There are a number of "digiscoping" alternatives where relatively inexpensive telescopes can be used as a mirror lens.
Since you didn't say which fixed lens camera you have, it's important to know that this afocal solution works best with the small lens cameras like the Nikon CP series. These cameras have very small lenses with 28mm filter threads. Several companies such as William Optics (DCL-28 ) as mentioned in the thread and ScopeTronix make eyepieces which have 1.25" barrels and work with many different astronomical type telescopes. These telescopes have various fixed focal lengths. For example, the Meade ETX-90 has a 1250mm focal length at F13.8. Some of the larger scopes have shorter fixed focal lengths and some are longer. With an eyepiece such as the 24mm William Optics DCL-28, you can shoot at up to about 6000mm with excellent results on reasonably close targets (not too much atmosphere between the lens and subject) and with good lighting. If your camera has a larger objective, there are eyepieces available with large exit pupils, but expect vignetting at all but full zoom. If you are serious about digiscoping, visit the digiscoping forum here and get more information. Lin |
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#9 |
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Lin, i did post that i have a fuji s602z. i have the 55mm adapter tube and a couple of filters for it. i'm just trying to figure the best way to get 3x to 5x the focal length with reasonably good results.
the 210 mm equivalent FL is just not long enough for me. hey i may wait a year or so and get me a dslr and some really fine macro and tele lenses. look wht the eos rebel 300 is going for with a lense. amazing!!!! i have a 4 1/2 inch reflector telescope and have a bunch of adapters to use afocally but, i don't seem to be able to focus well. the camera wants to focus on the secondary mirror and all i see is the image of the primary mirror with the secondary obstruction in the center. oh, that's a different matter. anyway, i just would like to be shooting in the 35mm equivalent of 600mm to 1000mm for wildlife. just can't get close enough to birds and squirrels and chipmunks with what i have. thanx!!! dennis |
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#10 | |
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Join Date: Jun 2002
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The TCON-300 was made for the Olympus E10/E20 and is a superior optic, but comes with an adapter brace which connects to the camera's tripod mount and by way of a "sole plate" to the lens which simply sets in very close proximity to the camera's objective. Unfortunately, even at today's reduced prices (the original cost was over $600) the TCON-300 is usually over $400. Add another $100 or so for the fabrication of the mount (the one for the E10 won't work) and you are back to nearly the price of the S602Z. I use the TCON-300 with my Olympus E10, Sony F707, Olympus C2100UZ, Olympus E-100RS and Fuji S602Z, but truthfully, you would be money ahead in the long haul to get the new Canon dSLR so you can use a wide variety of quality lenses for this purpose. Best regards, Lin |
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