purple. The gram negative bacteria will retain their outer cell membrane, and stay purple when your staining is done. Thus both gram positive and negative bacteria will stain purple without the alcohol/acetone step. What would happen if you forgot to … Continue reading →

If well maintained, I’d say 10+ years easy. Lenses tend to become outdated before they actually wear out, and this is one of the reasons that people often recommend focusing on good lenses over a good body. How long should … Continue reading →

Wear your new varifocal glasses as much as possible (even if you’re not used to wearing glasses all the time). The more you wear them, the quicker you will get used to them. Turn your head to point in the … Continue reading →

Samyang’s 16mm f/2 wideangle prime and Canon’s inexpensive compact EF-S 24mm f/2.8 STM are the sharpest primes. What focal length is the sharpest? And you’ll read f/8: both 10 feet and ∞ are sitting above f/8 on the depth-of-field scale. … Continue reading →

When film negatives are too dark, it likely means it was overexposed. Film speed may have been set too low, shutter speed too slow, or the aperture too wide, or maybe all of the above. It is also possible that … Continue reading →

Once you connected the cameras to the NVR (network video recorder), the cameras will record and save to the NVR without accessing your home router network. No one can hack into the private camera subnet. How do I secure my … Continue reading →

The shorter the lens the wider the angle of view the longer the lens the narrower the angle of view. Besides forming an image a lens controls some of the light entering the camera. A lens is paramount for any … Continue reading →

A simple light microscope manipulates how light enters the eye using a convex lens, where both sides of the lens are curved outwards. When light reflects off of an object being viewed under the microscope and passes through the lens, … Continue reading →

Most contact lenses should not be worn overnight, as it could increase the risk of eye infection. Contacts meant for daily or one-time use can generally be worn up to 14 to 16 hours with no problem, but your doctor … Continue reading →

The method usually employed to preserve a specimen of a fungus colony which has been prepared for microscopic study is to “ring” the edge of the cover slip with balsam, petrolatum, de Khotinsky cement, melted shellac or some similar preparation. … Continue reading →

The lens is the camera’s most important part. More than any other camera component, the lens determines the quality of the image. The most important part of a camera is its lens since the quality of an image is so … Continue reading →

The Canon RF lens mount is an interchangeable-lens mount developed by Canon for its full-frame mirrorless interchangeable-lens cameras, and featured first by the EOS R, followed by the EOS RP. The RF mount was announced in September 2018. What’s the … Continue reading →

The distance between the projection plane and the lens of the camera is image distance. Object distance can be obtained by applying image distance to lens formula. This method is proved to be effective and a single distance measurement can … Continue reading →

A breech-lock is a system for mounting camera lenses to camera bodies. The lens is attached to the camera by means of a rotating ring which is used to tighten the lens to the camera by friction. Other methods for … Continue reading →

So (@Rob_92) tweeted the West Midlands branch of Highways England saying: “Why is there a speed limit of 60mph on the M42? Hardly smart, it’s not even busy! Does M42 have speed cameras? This M42 Active Traffic Management (ATM) scheme … Continue reading →