APM LZOS 203mm Triplet APO f/6.9
The APM LZOS 203mm Triplet APO f/6.9 is our new large imaging machine. Soon a matched field flattener for full-format CCD imaging and film cameras up to 6×7 cm will follow. LZOS again did a superlative job in designing this large color free Apo, even given the challenge of its very fast speed. They did a stunning job implementing this lens within these design parameters. The image quality and color correction of this fast model are so exceptional that you can utilize similar visual magnification as with our famous f/9 model.
We recently had a wonderful first light experience with this new model. Mars was pushed up to 500x with great sharpness and contrast. The Veil Nebula was viewed with great detail under moderately light polluted sky without any nebula filter, all thanks to the great contrast.
The tubes are made in Germany with non-compromising mechanical quality. The dew cap slides smoothly over the tube without producing any paint scratches. The focuser is a full 3.5″ size. It rotates smoothly and with zero image shift. This zero shift rotation is very important when your camera has already achieved its best focus and you would like to rotate it to the best position. The finder bracket has a quick exchange style screw system and is mounted on the rotatable focuser, which allows focuser rotation to bring the finder scope to the most comfortable observing position. The focuser comes with large anodized focuser knobs and moves extremely smoothly when racking. The focuser comes with a screwed on 3.5″ / 2″ adapters and a 2″ / 1 1/4″ clamp ring style adapter to protect your eyepieces and diagonals from scratches. The tube rings are flat on both sides and offer five tapped 1/4-inch holes perpendicular to the tube line with the outer hole´s center to center spacing of 3.2″ and 2.362″. The center tapped hole can be used for different mounting plates with only a single center hole. The tube´s internal baffles are matched for a large useable photographic field. This system with the matched field flattener for full-format CCD chips and film cameras up to 6×7 cm offers an image circle of appropriate size.
Due to the relatively short length and large lens / cell, this model is quite front heavy. Therefore we offer to our customers, for additional charge, the installation inside the tube of extra counterweights for proper balancing. Discuss this with us when you place your order, such that we can build in the balance point you like on your incredible, custom-made, 8″ f/7 Apo.
About APM Apochromat
APM apochromats are manufactured according to the highest standards and comply with stringent specifications. As a result of these challenging requirements there are several companies based in different countries who are also responsible for this finish. We are proud that we are thus able to bring the world of astronomy a little closer together and are pleased to present here some background information on the elements incorporated in our telescopes.
The Russian glass specialist manufactures the high quality lenses and lens mounts for the APM Apochromats. Besides grinding and polishing, this work also includes the sophisticated application of multicoatings by vapor deposition.