Why do I need a focal reducer?
Focal Reducers. Focal reducers are primarily used in astrophotography to compress the light cone exiting the telescope down to a size closer to that of the sensor within your camera. This also results in a brighter image which reduces the exposure time.
Does a field flattener reduce focal length?
Some flatteners do just that: they flatten the field removing the field curvature created by the telescope. Some flatteners are also reducers: this means that while they correct the field curvature, they also reduce the focal length of the telescope.
Is a field flattener necessary?
To use a telescope for photography an optical device is needed to convert your telescope from a visual instrument to a photographic camera lens. This optical device is a field flattener (or reducer/flattener). Without a field flattener stars that are not in the center will appear distorted.
Can you use a Barlow lens with a zoom lens?
Just unscrew (most barlows do) the bottom lense of the barlow and screw it onto your zoom as you would a filter. Used this way, the combo will give you x one and a half and makes it much easier to view through.
Do I need a field flattener?
To use a telescope for photography an optical device is needed to convert your telescope from a visual instrument to a photographic camera lens. This optical device is a field flattener (or reducer/flattener). Without a field flattener stars that are not in the center will appear distorted. Spacing is critical.
What does a field flattener reducer do?
Field flattener lenses in binoculars improve edge sharpness and lower the distortion. Field flattener lenses counteract the Petzval field curvature of an optical system. In other words, the function of a field flattener lens is to counter the field-angle dependence of the focal length of a system.
Are 3x Barlow lenses good?
There is also 3x Barlow Lens, although unlike the 2x Barlow lens, this more powerful lens may not be as compatible with all telescopes. Generally, although Barlow lenses are a great, affordable way to extend your eyepiece collection, you will find that the images you’ll get with one will be slightly degraded.
Which is better 2x Barlow or 3x Barlow?
The standard Barlow lens has 2x magnification, and will connect directly to your eyepiece. There is also 3x Barlow Lens, although unlike the 2x Barlow lens, this more powerful lens may not be as compatible with all telescopes.
Do focal reducers increase field of view on Sct?
Lots of talk about focal reducers increasing the field of view on SCT, again strictly speaking this isn’t true, I find the best way to see the widest view and take advantage of the wide light pipe that comes out the back of an SCT is with a good 2 inch wide field eyepiece.
What is a focal reducer?
Focal reducers are very versatile accessories. More powerful focal reducers are limited to photographic use, but the f/6.3 reducer works well visually or photographically. When used visually, they extend the field of view. Eyepieces used with a focal reducer yield lower-power views.
How do you use a focal reducer on a telescope?
Focal reducers for refractors are easy to use. They usually have a 2″ barrel that slides into the telescope focuser. The telescope side of the barrel is often threaded with an M48 x 0.75 thread for standard 2″ astronomy filters.
What is the focal length of the SCT tube?
The SCT is an optical system. The focal length of the optical system has nothing to do with the length of the tube in much the same was as a 300mm telephoto lens is only about 220mm long. Link to comment