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| 1 | 2 | 3 |  » Stats |
Members: 48,632
Threads: 78,838
Posts: 820,856
Top Poster: glsammy (14,775)
| | Welcome to our newest member, ratneck7 | |  | 
22-09-2009, 07:52 AM
| | New Member | | Join Date: Jul 2009 Location: Cadishead, Manchester
Posts: 13
| | | Lens Help
Hi, My Wife as just bought a OPTON 500 mm f/8 manual focus super telephoto lens ( wich allso has a x2 convertor with it ) for me wich i am hoping to use on my Pentax K100D. The only thing is i can not seem to Focus in on things far away. I am not sure what settings to put my camera on. All the Lens as on it is a Focusing Ring on the end. Thank you. Barry |
25-09-2009, 07:20 PM
| | Commander of the Wild Empire | | Join Date: Jan 2008 Location: S. Devon
Posts: 3,668
| | | Re: Lens Help
Have you tried it without the converter on a tripod or similar steady surface.
A 500mm lens is difficult to hand hold at the best of times, especially with manual focusing and a converter would make this virtually impossible. x2 converters only work well with really top notch lenses.
An F8 lens will require good light.
This lens is being discussed on this site OPTON 500f/8 lens so it might be worth going there for advice. |
25-09-2009, 10:45 PM
| | Commander of the Wild Empire | | Join Date: Jul 2008 Location: Watford, Hertfordshire.
Posts: 4,554
| | | Re: Lens Help
Quote:
Originally Posted by Geoff F  An F8 lens will require good light. | With the 2x converter it will be f16, and require even better light!
Jim |
25-09-2009, 11:04 PM
|  | Knight Grand Cross of the Wild Empire | | Join Date: Feb 2006 Location: i'm right here
Posts: 11,092
| | | Re: Lens Help
Quote:
Originally Posted by Jim Ford With the 2x converter it will be f16, and require even better light!
Jim | and as this is a fixed apperture mirror lens it will require more light than the comparable telephoto - you also get donuting on your images.
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