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Details
APO 180 f/7 Fluorit Apochromat
It could be counted as largest portable telescope. It fits in any car and could be lifted and installed on the mount by one person. Same excellent color correction as in APO160FL.
The APO 180 has number of features that in a given combination are rarely found in one scope:
- Precision apochromatic objective with modern coating that makes lenses almost invisible.
- Retractable Dew Shield.
- Light weight tube assembly.
- FeatherTouch 360° rotatable focuser with coarse and fine focusing
- Collet type eyepiece holder
- Precision tube rings with adjustable latches
The advantages of Fluriot to ED glass: less adsorption or rather more transmission
APO 160 FL Apochromat vs. APO 140 EDPictures taken with TEC APO 180 FL
Specifications
Clear aperture 7" / 180 mm Focal length 1260 mm Focal ratio 7.0 Image scale 2.7 arc min/mm Field curvature 450mm Resolution (theoretical) 0.66 arc sec Focuser Feather Touch 3545 Eyepiece holder 2" Collet type Focusing range 4.5" / 114 mm One turn focus travel Coarse 21.5 mm / Fine 2.3 mm Back focus distance 7" / 180 mm Focuser load capacity 10 lb Tube assembly diameter 8" / 201 mm Dew shield dia. 9.2" / 234 mm TA length (shortest) 45" / 1140 mm OTA weight 36.5 lb / 16.5 kg Balance point position 20" from focuser's flange Lens coatings: Broad band 5 layers antireflection coating (BBAR) Recommended 0.72x Quad Telecompressor # 140 5373 of Astro Physics
This Reducer/Corrector reduces the focal length of the 180 FL from 1.260 mm to 900 mm and gives you a focal ratio of f/5. For a full frame camera (24 x 36 mm), this results in a field of view of 1.5 x 2.3 degree at an image circle of 50 mm, diffraction limited and free of vignetting.
Related Articles
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Apochromatic Triplet Objective: Why oil-spaced lenses?
Why an oil-spaced triplet-lens? The first successful experiments with oil-spaced triplet-lenses were probably done by Wolfgang Busch from Ahrensburg, who had several discussions about this with Carl Zeiss Jena, back in the days of the German Democratic Republic. Even then, this technique was far superior to the standard technics like air-spaced or cemented lenses. But it was hard to keep the joining medium inside of the lens, because of insufficient synthetic oils and many other reasons. Because of this, the lens could freeze or dry out. It took Zeiss more than ten years of research to solve these difficulties and present the first APQ-lens. Besides Zeiss, only Astro-Physics and TEC were able to produce long-lasting oil-spaced lenses. It takes some tricks and knowledge to keep the oil (if the fluid can still be called oil) inside of the lens – at least over a long period of time with always-changing temperatures. But with the necessary craftsmanship and patience, it can be done. Nevertheless, many people still think – wrongly – that an oil-spacing is especially prone to aging. This is surely true if you didn't master the technology, but we want to present a list of the pros and cons...
Additional Information
| General | |
|---|---|
| Manufacturer | TEC |
| SKU (#) | 1351080 |
| EAN Code | 4047825018915 |
| Optics | |
| Optical Design | Apochromatic Refractor |
| Aperture (mm) | 180mm (7") |
| Focal Length | 1260 mm |
| Focal Ratio | f/7 |
| Backfocus | 7" (180mm) |
| Tube diameter (max) | 8" (201 mm) |
| Image Scale | 2.7 arcmin / mm |
| Length of tube | 1140 mm |
| Optical length (mm) | 45" (1140 mm) |
| Optical Tube Weight | 36.5lb (16.5 kg) |
| Mount | |
| Included Items | |
| Focuser | Feather Touch 3545 |
Product Information
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