Feature

●102mm objective lens diameter and f/7 focal ratio telescope OTA; large objective lens brings more lights into the scope body and you will get more bright and clear image
●Crisp Image; ultra wide band multi-layer coating technology;102mm aperture optics and retactable lens hood deliver bright wide-field images with sharp resolution
●0.8x focal reducer and field flattener; for refractor telescopes; meet the illumination needs of full-frame shooting
●About the compatibility; has standard 2" filter thread; to add light pollution filter; a standard 2-inch socket in front end; to connect to the main lens; M48x0.75 threaded in back end; can be connected with the camera bayonet
●It will be durable; multi-coated optics; high polish; hard anodize finished aluminum body; to help reduce weight

Description

Features of using SV503 with SV193 focus reducing lens/field flattening lens:

1. The SV193 0.8X focal reducer/field flattener is designed for fixed field astrophotography with the SV503 102ED refractor. While it will also thread through and work with other makes and models of f/7 refractors that use 2" focusers, its performance with other ranges cannot be well.

2. The SV193 0.8X focal reducer/field flattener converts the 714mm focal length f/7 SV503 102ED refractor into a 571mm f/5.6 system for faster and wider astro and terrestrial photography. After the focal is reduced, the starry sky can be captured wider, the star points are finer, and the signal-to-noise ratio is better under the same exposure.

3. In addition to shortening the focal length of the telescope for faster photography, the SV193 0.8X focal reducer/field flattener the normal field curvature inherent in all refractors.

4. The front end is a standard 2-inch socket to connect to the main lens, and the back end is M48x0.75 threaded to connect to the camera bayonet (Support Full Frame Camera).

5. The default back-intercept is 55mm. Using the 360° field rotator at the end of the focusing tube (not included), you can meet your composition requirements without turning the main lens, and it can also meet the use of filter wheel/OAG/astronomical camera at the same time.

Equipped with a dual focus rack and pinion focuser, it provides you with fast focusing.
Super fully multi coated lens ensures high light transmission and bright clear image.

1 Double Helix Focusing 2 Rotate 360 degree 3 90mm Dual R&P Focus 4 ED objective lens 5 Ultra wideband Coating

1.25” and 2” adaptor

2’ to 1.25’ adapter ring is detachable and can be used as needed.

3-Elements/2Groups Lens Structure

Refractors have inherent normal field curvature. This provides images that are sharply focused to the corners of DSLR and CCD imaging chips. In your image, the stars appear sharp and point-like across the field of view. You dont have to worry about photos that have a sharp center and blurry edges.

1 Standard thread size 2 Installation steps 3 Field flattener 4 Hard anodize 5 Astrophotography

Specifications

Model	SV503
Type of build	Doublet air spaced achromatic
Glass Grades	S-FPL51
Aperture	102mm / 4.01-Inch
Focal length	714mm
Aperture ratio	f/7
Resolving capacity	1.17"
Tube weight	3.95kgs (8.6lbs)

Model	M54X1 Field Flattener
Back focus	55mm
Barrel Size	2-inch
Threads Standard	M48*0.75
Lens Structure	3-Elements/2Groups
Lens Coating	FMC
Blackened Lens Edges	Yes
Net Weight	177g / 6.24oz / 0.39lb