The stunning Gran Turismo 71 Apo is the new jewel of the apochromatic refractor world. From the pristine white finish on the CNC tube to the elegant red or gold trim, this telescope has more than just good looks: The new GT71 features a 3-element objective using high-quality FPL-53 extra low dispersion glass that reduces any secondary spectrum to an unbelievable degree.
The Gran Turismo series of telescopes have a three-element lens with ED glass (FPL-53) in the centre. This special glass ensures an image that is virtually free from colour errors. These telescopes therefore belong to the class of apochromatic refractors or APOs for short.
An APO with such a triplet lens delivers a sharp, high-contrast image. This has a very positive effect on planetary observation and compensates for the lower resolution capability of a large mirror telescope.
William Optics Flat6AIII 0.8x Reducer & Field Flattener - M63 to 2"
This William Optics 2" Field Flattener & Reducer has been designed to optimize the flat-field imaging performance of the William Optics Z81 refactor. The APO triplet optics of the Flat6AIII are made with Ohara glass and fully multi-coated to provide good illumination and a beautifully flat field across 97% of full frame sensors. The reducing factor is 0.8X.
Designed with M63 threads on the telescope side, the FLAT6AIII will thread directly into the telescope. Just remove the three screws on the focuser adapter, take off the adapter, and thread the focal reducer/field flattener on in it's stead. The Flat6AIII has 2" threads on the opposite side to accept a 48mm (Wide) T ring for your DSLR. There is even a slot behind the 2" threads to accept an M48 filter.
- Amount of Adjustment: 5.2 mm
- Back Focus: 60.2 mm
- Image Circle: 44 mm
Details and Features
- 2.5" R&P Focuser - The 2.5" R&P focuser is smooth, stable, and reliable. No image shifting!
- CNC Handle Bar - CNC-made Handle Bar with Vixen type saddle, anodized to match the optical tube.
- Bahtinov Mask - World's First built-in Clear Bahtinov Mask.
What's In the Box
- Gran Turismo 71 mm f/5.9 APO Triplet Refractor Telescope OTA
- 2.5" Rack & Pinion Focuser
- Handle Bar
- Bahtinov Mask Cover
- Dual Dovetail Plate
- Carry Case
Recommended Optional Accessories
- T-Mount for
- M4/3
- Nikon
- Canon
- Sony a
- Pentax
- Fuji
- Guiding Scope
- Flattener
- Eye Piece & Prism
- Finder Scope & Ring
- Red Dot Finder
Specifications
| Focal Length: |
419mm |
| Diameter: |
71mm |
| Aperture: |
f/5.9
|
| Camera Format: |
APS-C
Full Frame |
| Focuser: |
2.5" R&P Focuser
|
| Image Circle: |
> Full Frame
|
| Recommended Flattener: |
FLAT 6A III
|
| Tube Length: |
392mm (Fully Retracted)
470mm (Fully Extended) |
| Tube Weight: |
2.95 kg |
| Interchangeable T-Mount: |
Canon EF
Nikon F
Sony E
Pentax
Micro Four Thirds
Fuji FX |
