The 446TBL-20 1x/3x Stereo Microscope from National Optical is a dual magnification stereoscopic microscope fit for laboratories, high school and university students. The stereo (two) eyepiece configuration is preferred by most researchers and students because of the superior depth of field and comfort compared to monocular microscopes. This model of the 446 stereo microscope has a paired 20x eyepiece delivering 20x and 60x magnification. Two achromatic paired objectives are parcentered and parfocalled to keep the specimen centered and focused when switching between the two magnification settings. The stage can be illuminated from above and/or below using 10W tungsten lights activated by separate base-mounted On/Off switches. The top (incidental) light source has an adjustable beam to help optimize the brightness and contrast of the specimen.

A user-friendly design complements the range of features that make the 446 stereo microscope a welcome addition to labs as well as classrooms. The heavy-duty post-mounted adjustable viewing head permits use of specimen heights up to 35mm / 1.4", and is also capable of 360° rotation to help share the eyepiece among colleagues and students without moving the microscope. The rack and pinion system has a single focus dial and includes a slip clutch mechanism to prevent mishandling. An adjustable interpupillary distance, left-side diopter correction, and reticle holder/retainer provide the 446 series with the flexibility needed to create a customized viewing experience.

10W Top/Bottom Tungsten Lighting    45° Inclined Viewing Head    20x Stereo Eyepiece    1x/3x Objectives, 20x/60x Magnification    Parfocalled/Parcentered Paired Objective    80mm Frosted Glass Stage    Rack and Pinion Focusing

• Paired 20x inclined eyepiece
• 1x and 3x achromatic objectives
• 20x and 60x magnification
• Parfocalled, parcentered, paired objectives
• 75mm / 3" working distance, 35mm / 1.4" maximum specimen height
• Eyepiece with diopter adjustment and reticle holder/retainer
• 55-75mm / 2.2-3" interpupillary distance

• Rack and pinion focus system
• Slip clutch prevents over-turning
• Tension adjustment prevents focus drift

• Incidental (top) 10 watt tungsten illumination with adjustable beam
• Transmitted (bottom) 10 watt tungsten illumination
• Dual base-mounted On/Off switches

• 80mm frosted glass and 80mm reversible black and white stage plates
• Locked on metal stage clips
• 360° rotating viewing head
• Cast metal frame
• Grey enamel finish
• 14.6" (37 cm) maximum height
• 5.5 lb (2.5 kg) weight

Related Questions and Answers

Q: 1. Compatible with Nikon SB-910 AF Flash?

A: Yes as long as it has a cold shoe to mount your speedlight.

Q: 2. You will need to buy adapter for ad600 pro?

A: Yes, the Impact 16" Beauty Dish Reflector will need a Speedring adapter for the Godox AD600Pro Witstro All-in-One Outdoor Flash. You will need the Impact Beauty Dish Adapter for Impact Monolights, Bowens. BH # IMBDAIMP

Q: 3. What speedring do I need for this to fit an Impact Venture TTL head? Can someone provide a link or a lead?

A: This is what i used: https://a href= http://www.bhphotovideo.com/c/product/1148668-REG/angler_egd_hol_beauty_reflector_adapter_eli.html target= _blank www.bhphotovideo.com/c/product/1148668-REG/angler_egd_hol_beauty_reflector_adapter_eli.html/a

Q: 4. Do these really work well with speedlights? Wouldn't the light just get reflected out the back, unlike with a bare bulb monolight that directs light to the main part of the dish?

A: Yes, the Impact 20" Beauty Dish Kit for Speedlights and VC/VS-VSD Monolights, B&H # IMBD20BDK, works well for speedlight flashes. Some light may be reflected out of the back of the beauty dish, but that does not affect the quality of light that is coming out of the front of the beauty dish. (For the record, if a bare bulb flash were used with the above beauty dish and the sides were not blocked, it too would also lose some light out the back of the unit). If you feel this will be an issue for your images, you are welcome to devise a setup or contraption that will block light from exiting the back of the beauty dish by blocking or filling the space between the sides of the flash and the rear opening of the beauty dish. The whole point of the deflector plate in the center of a beauty dish is to bounce forward-facing light back into the beauty dish to fill up the beauty dish. If your flash has a zoom head, you could also simply set the flash zoom head to the wide angle setting, and/or purchase a Stofen-type Omni-Bounce cover to place on the front of your flash, which would extend the front of your flash and make it work similarly to a bare-bulb flash, scattering light in 180 degrees from the front of the flash head.

Q: 5. Will this hold a nikonD3200, 20mm, 50mm , 85mm lens and flash?

A: Agree with Michael. Should be fine. Also agree that the opening makes getting camera a tad tricky. However typically I use it to carry lens, flash and such while keeping camera out. I like mine.

Q: 6. Will I be able to fit an Olympus em1v2 with attached 12-100f4 on the bottom (ie tripod socket facing toward bottom of bag) and the 300 F4 laying down?

A: Think Tank Photo TurnStyle 20 Sling Camera Bag V2.0 will fit the Olympus OM-D E-M1 Mark II Mirrorless Camera with the Olympus M.Zuiko Digital ED 12-100mm f/4 IS PRO Lens attached. The Olympus M.Zuiko Digital ED 300mm f/4 IS PRO Lens will fit separately.

Q: 7. It could fit 70-200 attached and sigma 14mm f1.8 which is huge lens , and another tiny stuff?

A: I hace 70-200, 85mm,50mm 1.4 20-35mm and 5D mark II in this bag

Q: 8. Looking for a sling style bag and came across great reviews on this one. Can anyone tell me what the significant differences are between V2 and V1 of this bag, other than the color and slight price differences?

A: The V1 version has a quick release buckle for the shoulder strap, after detaching it you can connect it to the belt strap and wear the bag like a fanny pack. Awesome feature, no idea why Think Tank discontinued it. The description on the B&H site still mentions this for the V2 version but that's incorrect. Other than that the V1 and V2 versions are identical.

Q: 9. I have a canon 5d3 that I keep my 24-105 mounted. I typically also carry a 50mm and 70-300. I keep the hoods reversed on the lenses when not in use. It looks like it potentially would all fit. Would it be too tight?

A: Think Tank Photo TurnStyle 20 Sling Camera Bag V2.0 (Blue Indigo) measures internally 15 x 8.3 x 4.8". I would recommend placing the camera equipment on a table as it would go in the case and measure length, width, height and then compare the measurements to see if it would fit well.

Q: 10. In what country was this made?

A: The Impact 20 inch beauty dish kit is made in China.