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TOA-130 main features

The Triplet ED objective

The apochromatic objective with triplet ED of TOA-130 (D=130mm, F=1000mm, F/D 7,7) is assembled in an extremely neat and precise barrel mechanical, entirely adjustable. Collimation is easy to realize and makes it possible to adapt perfectly the optical stresses to the conditions of observation or imaging. The tube has a retractable dewshield.
The two versions S and F are equipped exactly with same optics. Only the rack-and-pinion focuser differs.

The TOA-130S rack-and-pinion focuser

The S version has a traditional rack-and-pinion focuser of 69mm of diameter. The back focus is important. To obtain the exit of the focal point, the refractor is equipped with a focuser extension tube, removable (see the system-charts) and with a 50.8mm traditional one. A balancing counterweight cradle is provided because of the important weight of the objective. For photography, the FL-35 flattener offers a consequent image circle of 40mm diameter.

The TOA-130F rack-and-pinion focuser

The balancing counterweight cradle and the removable extension tube for focuser are not necessary on the F version because the rack-and-pinion focuser, alike FSQ, is much more massive (102mm of diameter). A camera angle adjuster is delivered, included in the focuser. Thanks to this configuration, the F version is resolutely turned towards imaging. It allows more rigid imaging assemblies in particular with CCD cameras of big size, without generating mechanical stresses. Last but not least, this focuser enables it to accept some of the specific accessories of the TOA-150, such as the 645-RD reducer or the 67-FL flattener which offers an incredible image circle of 88mm diameter (60% not vignetted).