Eyepieces are interchangeable and many different eyepieces can be inserted with different degrees of magnification.

Eyepieces are optical systems where the entrance pupil is invariably located outside of the system.

Eyepieces are differentiated by their field stop, which is the narrowest aperture that light entering the eyepiece must pass through to reach the field lens of the eyepiece.

Eyepieces for telescopes and microscopes are usually interchanged to increase or decrease the magnification and to allow the user to select a type with a certain performance characteristic.

Eyepieces also offer varying fields of view, and differing degrees of eye relief for the person who looks through them.

Eyepieces for microscopes have standard barrel diameters measured in millimeters: 23. 2 mm and 30 mm, slightly smaller than telescope barrels.

The party is usually in a room small enough so that all guests are within sight and hearing of one another.

Questions and, particularly, exclamations are usually channeled along informal, horizontal lines not indicated in Figure 3 and seldom are carried beyond the nearest neighbor.

So all-important are ideas, we are told, that persons successful in business and happy in social life usually fall into two classes: those who invent new ideas of their own, and those who borrow, beg, or steal from others.

One is so accustomed to think of men as the privileged who need but ask and receive, and women as submissive and yielding, that our sympathies are usually enlisted on the side of the man whose love is not returned, and we condemn the woman as a coquette.

By a combination of music, lighting effects, and narration, famous events that have transpired in these locations are evoked and re-created for large audiences usually to considerable acclaim.

Although he questions the extent and nature of the alleged revival of religion and the alleged increase in conformity, and thinks that `` hedonistic '' present-time orientation does not have the meaning usually attributed to it, he does conclude that Americans increasingly enjoy leisure without guilt, do not stress achievement so much as formerly, are more accepting of group harmony as a goal, more tolerant of diversity and aware of other cultures.

Faced with a gesture like Di Bosis', I find usually that my sentiments are closer to those of my sculptor friend.

Even with all possible precaution, homecomings are usually rather cruel and sad, and only the perpetually ebullient and the continually optimistic are made happy by them.

the rub arises from the fact that teachers are usually paid on the basis of time served rather than quality.

These short, `` streamlined '' meetings usually are sponsored by local banks, Chambers of Commerce, trade associations, or other civic organizations.

Business loans generally are repayable in regular installments -- usually monthly, including interest at the rate of 5-1/2 percent per annum on the unpaid balance -- and have a maximum maturity of 10 years ; ;

These roads are largely of less than highway standards, and usually carry traffic which is related to use of the National Forests.

Much of this necessary increase in research and development, though properly chargeable to current expenses, is not reflected in earnings until projects are completed and the new machines sold in quantity, usually over a period of several years.

Occasional meetings are held for the whole membership, usually with a guest speaker, while smaller discussion groups meet more frequently.

If there are any major restrictions, they usually can be obtained in printed form.

usually concerned about America's belief that attainment and success are measured in dollars and titles.

International Touring Documents are usually provided with the car as are road maps and touring data.

Such an instrument is expected to be especially useful if it could be used to measure the elasticity of heavy pastes such as printing inks, paints, adhesives, molten plastics, and bread dough, for the elasticity is related to those various properties termed `` length '', `` shortness '', `` spinnability '', etc., which are usually judged by subjective methods at present.

Greases, stains, and miscellaneous soils are usually sorbed onto the soiled surface.

It is almost certain that some of these, usually a trifle smaller than the honeybees, are andrenas or mining bees.

Over a relatively short period of time, usually about four to twelve weeks, the worker must be able to shift the focus, back and forth, between immediate external stressful exigencies ( `` precipitating stress '' ) and the key, emotionally relevant issues ( `` underlying problem '' ) which are, often in a dramatic preconscious breakthrough, reactivated by the crisis situation, and hence once again amenable to resolution.

They emerged as interchangeable cogs in a faulty but formidable machine: shaved nearly naked, hair queued, greatcoated, jackbooted, and best of all -- in the opinion of the British professional, Major Semple-Lisle -- `` their minds are not estranged from the paths of obedience by those smatterings of knowledge which only serve to lead to insubordination and mutiny ''.

The most common are the twist drill, the solid center shaft with interchangeable cutting blades, the double spur bit, and the power wood bit.

Today, that distinction has mostly disappeared and the terms " astronomer " and " astrophysicist " are interchangeable.

An assembly line is a manufacturing process ( most of the time called a progressive assembly ) in which parts ( usually interchangeable parts ) are added to a product in a sequential manner to create a finished product much faster than with handcrafting-type methods.

Today, the terms molecular biology and biochemistry are nearly interchangeable.

The blades for this type of utility knife come in both double-and single-ended versions, and are interchangeable with many, but not all, of the later copies.

For example, although the words wee and little are interchangeable in some contexts, wee ( as an adjective ) is almost exclusively written by some people from some parts of northern Britain ( and especially Scotland ) or from Northern Ireland, whereas in Southern England and Wales, little is used predominantly.

Although these two are often considered interchangeable, compilers and execution environments usually assign different signals to these.

An Administrator is required in the Consumer Proposal, and a Trustee in the Division I Proposal ( these are virtually the same although the terms are not interchangeable ).

Therefore, discs with capacities larger than 650 MB, and especially those larger than 700 MB, are less interchangeable among players / drives than standard discs and are not very suitable for archival use, as their readability on future equipment, or even on the same equipment at a future time, is not assured, even under the assumption that the discs will not degrade at all.

It has less sugar and more liquor than semisweet chocolate, but the two are interchangeable in baking.

However, cornets and trumpets are not entirely interchangeable, as they differ in timbre.

Assumptions are that colonialism and imperialism are interchangeable, however Robert Young suggests that imperialism is the concept while colonialism is the practice.

To most engineers, the terms " digital circuit ", " digital system " and " logic " are interchangeable in the context of digital circuits.

Often ' b ' & ' p ' are interchangeable, for example ' baggage ' becomes ' pagas ', ' lob ' ( to throw ) becomes ' loopima '.

The terms extermination camp ( Vernichtungslager ) and death camp ( Todeslager ) are interchangeable usages, each referring to camps whose primary function was genocide, not for punishing crime or containing political prisoners, but for the systematic killing of the prisoners delivered there.

Among these assumptions are several which are impossible to fully achieve in a real market, such as complete information, interchangeable goods and services, and lack of market power.

The imperial gallon, quart, pint, cup and gill are approximately 20 % larger than their US counterparts and are therefore not interchangeable.

For clinical purposes, plasma and serum levels are similar enough to be interchangeable.

DNA is a long polymer which incorporates four types of bases which are interchangeable.