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QUESTAR FR-1 MKIII LONG DISTANCE MICROSCOPE/LENSThe Questar FR-1 is a high resolution long distance microscope that differs from other Questar LDMs in that its range of focus spans not only from near but also out to infinity. The FR-1 provides a working distance to the object of study from as close as 91cm (36 inches) and to as far away as infinity and so this instrument is suitable for imaging from its near focus limit out to the Moon and beyond. This allows the FR-1 to be employed at greater distances from the subject of study all the way out to infinity as an ultra telephoto lens with a diffraction limited field at prime focus 18mm diameter at the focal plane or even larger with the use of auxiliary lens elements. The optical resolution capabilities can reveal detail as fine as 6 microns at the closest working distance.
Right: FR-1 MKIII long distance microscope, with lens cover set to the side (81,183 bytes).
The FR-1 MKIII are among the 33000 Series long distance microscopes. These are comparatively lightweight instruments and offer superb performance and at reasonable cost for general industrial or research applications, or for teaching. The FR-1 MKIII assembly includes one Axial Port (rear port) so it is compatible with common industrial CCD and video format cameras as well as with the popular 35mm film SLR or digital (DSLR) cameras. The FR-1 MKIII differs from the QM-1 MKIII and QM-100 MKIII instruments arrangements in that those instruments also incorporate a second port that is typically used for visual work with an eyepiece or for Brightfield illumination technique with a fiber optic light guide. It would be possible to configure the FR-1 MKIII Axial Port to support a camera, or it could accommodate an eyepiece or an eyepiece with a diagonal for visual applications.
Our long distance microscopes can accept auxiliary lenses that permit the user to increase or decrease the field of view, these thread into the provided Camera Coupling set. The changes in field of view will depend on comparative formats to be employed, as well as the lenses. So for example if you are employing a 2/3 inch (8.8 mm) format sensor then you could increase the field of view by changing this for a larger format digital SLR for example. Alternatively you could increase the field of view by employing the 2/3 inch sensor with a Positive Lens, these are available in focal lengths of 100 mm, 130 mm, and 172 mm. To increase magnification you can attach a Barlow Lens.
The standard Questar FR-1 MKIII (PN 33004) is a catadioptric optical arrangement that incorporates a borosilicate corrector lens and auxiliary optics making this set suitable for work from 350 nm in the ultraviolet up to 2200 nm in the infrared. For clients requiring added capabilities beyond that of the standard instrument we also offer a Fused Silica configured set (PN 33024) expanding the transmission Range from 180 nm in the vacuum UV up to 4000 nm, or Calcium Fluoride (PN 33044) with a working transmission range from 350 nm to keeping into the IR at 7000 nm.
Right: Current production FR-1 MKIII Long Distance Microscope, Long Mount variant with lens cover aside (114,018 bytes).
The MKIII housing provides improved foresight alignment over traditional basic models. This configuration also allows for the factory installation of options including motorization of the focus control; with motorized focus control one can adjust focus with the push-button controller or even remotely.
These instruments are provided with a selection of tapped and threaded holes so that the instrument may be supported on steady fixtures or built into another device, or the instrument may be installed onto any of Questar's line of fixturing and transit/measurement positioning stages.
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