SV555 Astrograph Telescope APO 54mm f/4.5 - New Upgrade - Perfect Focus Zero Compromise

SV555 New Upgrade, New Experience

We' ve updated the sandblasting process from a 320-grit to a 280-grit finish.This gives the new version a more refined, matte texture that not only looks better but also resists fingerprints. You'Il see a clear dlifference in the side-by-side comparison we' re showing here. Next, we've managed to reduce the weight of the tube by over 90 grams. This makes the new version lighter and more portable. The third improvement is in the reduced lens hood. The outer diameter of the lens hood is reduced from 97mm to 93mm and the wall thickness from the 3mm to 2.5mm. This makes the hood more compact and lightweight while maintaining its functionality. Finally, we’ve increased the focus travel from 2.67mm to 3.22mm. This provides a smoother and more precise focusing experience, especially for astrophotography. 

Svbony SV555 professional astronomical photography Astrograph Telescope APO is designed for deep-sky photography. Petzval objective lens structure includes a triplet lens and 2-ED glasses offering a clear image without aperture blocking. 44mm full frame has a wide field of view and provides a clearer image. EAF kit and fine adjustment make it convenient to shoot. F22 to F4.5 variable aperture meets different use needs. For photography users, SV555 will be a better choice to use.  It is going to be an ace travel lens for your journey.

Test Report Interferogram

SV555 astrophotography telescope camera lens can adjust the aperture from F22 to F4.5; professional astronomical photography lens includes a graded adjustment ring and scale; keeping the parameters the same without changing due to accidental touching; increasing the accuracy of shooting, meeting a variety of use needs.

The SV555 ED APO astro camera lens uses integrated structure and light weight; increasing the ease of use when shooting.

SV555 APO astro camera lens is featured with a handle; bracker; and dovetail plate; making it more convenient to use the lens when shooting. With a lockable 360° rotator and rotatable lens tube, the APO telephoto lens is convenient for adjusting and saving the angle. Whether daily shooting or astrophotography, you can find a suitable angle for a better shooting effect.

Compatible with cameras; the M72 front filter thread can be connected to the camera filter for daily photography; the design increases the flexibility and ease of the APO telephoto lens. Dual rotate design; lockable 360° rotator and lens tube help you adjust the angle accurately; astrophotography telescope offers a better photography effect to you.

Increased image quality; SV555 APO astro camera lens consists of a 3-group 5-piece petzval objective lens structure; which includes a set of triplet lens; bringing you a clearer image. Petzval objective lens structure with triplet lens offers a flatter field of view. What' more, the astrograph lens has featured with ultra-wide field of view for larger targets, and pin-point stars edge to edge with almost 0 chromatic aberration.

FAQ

1. Q1: The filter thread on the rear adapter plate of the SV555 does not have enough space to install the filters.
   A1: The internal filter slot of the CAA supports standard 2-inch filters with a thickness of 7.5mm. If you are using filters thicker than 10mm, they may not be compatible.

1. Q2: The four small screws for installing the camera adapter plate are cumbersome to remove and replace. This should be a threaded solution.
   A2: The design features a standard 55mm back focus, which has already reserved space for filter installation. The filter mount in the CAA is more of an alternative option. If you plan to change filters while shooting, we recommend equipping a filter drawer or a filter wheel.

1. Q3: The camera rotation ring operates smoothly. Sometimes, it causes the entire tube to rotate within the mounting bracket instead of just the camera rotator.
2. A3: To address this issue, we recommend replacing the thumb screw inside the clamp with an M5 hex socket screw. The threading specifications remain consistent, allowing you to secure the clamp tightly using an Allen wrench, preventing the CAA from rotating the entire telescope. 

1. Q4: The lens cap is difficult to put on, perhaps it's due to the dew shield?
2. A4: The objective lens cap needs to be screwed on rather than simply pressed. Align it with the threaded opening and turn clockwise to secure it firmly.

1. Q5: The dovetail cannot be attached to the Arca-Swiss mount.
2. A5: We will optimize the overall design to ensure compatibility with Arca-Swiss mounts. Currently, if you are using an Arca-Swiss bracket, we recommend considering the F9143C dovetail plate, which features a UNC 1/4 thread output that meets astronomical requirements.

1. Q6: What is the problem of a "pinched stars"?
2. A6: The cause of this problem is not in the best focus. If in the right focus, it would disappear. You can solve this problem through the following solutions. If in 55mm back focus, pls set your EAF working parameters: please set the step size to 80-100; backlash about 30.  Before starting EAF, please manually rotate the focus ring to move between the 164-∞ symbols, and then start EAF autofocus. The normal SV555 focus position should be around "∞"

1. Q7: Some other brand features dual-speed focusing while SV555 is helical focusing.
2. A7: Our standard EAF (Electronic Automatic Focuser) installation kit meets customers' needs for precise focusing. 

2. Q8: The rear 2-inch filter on the Askar can be easily unscrewed by hand, unlike the SV555, which has four hex screws that require removal each time you change the filter.
3. A8: To ensure collimation with the M48 camera interface, we designed the SV555 with four fixed screw holes. The CAA comes equipped with a built-in 2-inch filter slot, which is more suitable for portable color camera users who typically do not require frequent filter changes. However, for professional astrophotographers, we recommend a dedicated filter drawer and electronic filter wheel as the preferred solution. We provide a standard 55mm back focus, allowing for seamless filter switching for professional users.

4. 1. Q9: Has the halos in the scope been solved?
   2. A9: Yes.

1. 1. Q10: Does the SV555 need a field flattener?
   2. A10: No, because SV555 is a petzval structure with an internal flat field design.

1. 1. Q11: Matching element Lanthanum glass? what is the ED lens material?
   2. A11: Yes, our optical design uses H-ZF lanthanum glass for superior performance. FCD 1

1. 1. Q12: What's the difference between the old and new versions?
   2. A12: The key upgrades are lighter weight and more compact size. Most importantly, every new unit now undergoes stricter quality testing to ensure flawless performance.

Package Includes:

• SV555 54mm f/4.5 OTA
• EAF Mount Kit
• Handle with integrated Vixen Finder saddle
• Dovetail plate with M6 threaded holes
• Camera Angle Adjuster
• 2" Filter Holder (assembled with the Lens)
• Plastic Lens Cover
• Soft Padded Case
• Instruction Manual