Opticstar F0.5 Focal Reducer.

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Focal Reducer

	F 0.5 focal reducer Fits standard 1.25" focusers Two lens system for better correction Metal and glass construction

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Focal Reducer

Order No.	Price (U.S. Dollars)	Shipping	Delivery	click to purchase
OSRFR105	$ 40.00	$ 10.00

Outline

This is a F 0.5 focal reducer. It will fit on standard 1.25" nosepieces. The focal reducer, reduces the focal length of the main optics to half, doubling the field of view. This is useful in visual observation and photography.

The focal reducer consists of a two lens cemented system for better correction and it is made out of metal and glass.

Exposure Times

When attached to a telescope the f0.5 focal reducer will typically reduce exposure times to near a quarter when imaging extended objects like galaxies, nebulae and the Moon.

Telescopes with low focal ratios require shorter exposures when imaging extended objects (for example an f/8 system will require four times the exposure of an f/4 system). This does not apply to non extended objects (point sources) like stars where aperture dictates what can be seen/captured.

Notice

We are constantly checking the accuracy of the technical data. We are prepared to provide more detailed information on request. Technical data is subject to change without notice.

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European Union Customers

Customers from European Union member states can purchase any of the products listed here from our dedicated E.U. website.

International Dealers

North America

posted: 8th October 2009

Complete list of dealers.

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updated: 4th August 2010

Day    Opening Hours

Monday    9am - 5pm
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We are closed on Sundays and public holidays.