Parfocal length

Many times microscope objectives with high magnifications will have very short working distances to the focused spot. Because of this short distance, if one is not careful while focusing in on the targeted specimen, the end of the microscope objective may "crash" into the object under study. These Long Working Distance Objectives are ideal to use when the application requires there be room between the objective and the target for other equipment like pipettes or syringes. These objectives have some of the world's longest working distances.

Infinity corrected objectives are used in a wide variety of imaging and laser focusing applications. Light rays leaving the objective’s rear aperture are collimated, so that for imaging applications, a secondary lens (usually called a tube lens) is needed in order to focus the collected light from the specimen onto the sensor. The labeled magnification is calculated, assuming the objective is being used with a tube lens of a particular focal length by design. When a tube lens of a different focal length is used, the magnification will need to be adjusted accordingly. As an advantage over finite conjugate objective lenses, a variety of auxiliary optical components, such as optical filters and polarizers can be inserted between the infinity objective lens and the tube lens without altering how the beam propagates and forms the image down the optical path. In laser applications such as optical tweezers and laser cutting, laser beams entering the rear aperture of an infinity objective can be tightly focused to a diffraction-limited spot, providing concentrated optical power and excellent resolution.

The thread on the long working distance objectives are M26, so the M26-RMS adapter is required to step down to standard RMS threads.  Please make sure to purchase one for use with any RMS mount such as the LH-OBJ microscope objective holder.

Long Working Distance Microscope Objectives are designed around 426 to 656 nm to provide a chromatic aberration-free image with flat field correction. The objectives are called “Plan” because they produce the flat image across the field of view. The “apochromat” objectives provide chromatic correction for three wavelengths and spherical correction for two wavelengths. In the case of white light, plan apochromatic objectives offer superior images for color photomicrography than achromatic objectives can provide.

Yes, opt-in.  By checking this box, you agree to receive our newsletters, announcements, surveys and marketing offers in accordance with our privacy policy

Domani a Mantova la manifestazione di beneficenza e solidarietà inizierà, in accordo con la Federazione Italiana Canottaggio e la Canottieri Mincio, alle ore 9:00 con una sfilata simbolica di due equipaggi di dragon boat. Questo momento, inserito nel contesto del mese della prevenzione del tumore al seno, vedrà protagoniste donne operate di tumore al seno, che percorreranno 200 metri per sensibilizzare sull’importanza della prevenzione nella lotta contro questa malattia.

Testata giornalistica registrata al Tribunale di Roma in data 12 giugno 2007 al n. 234 Direttore responsabile: Claudio Tranquilli Contatti: Tel. +39.3666879879 - e-mail: [email protected] Redazione: Niccolò Bagnoli - Luigi Mancini Webmaster: Enrico Bozzello

Field of viewmicroscope

Il via ufficiale dell’evento “Via le Mani” è poi previsto alle ore 9:30 con le gare sui 500 metri. La prima competizione vedrà protagonisti gli equipaggi della categoria open mix, seguiti dalle categorie open femminile e open maschile, tutte a bordo della barca ammiraglia del coastal rowing: il quattro con timoniere. Dopo le gare in acqua, la manifestazione proseguirà con le competizioni indoor sui remoergometri, che concluderanno la giornata.

Madrina dell’evento sarà Federica Cesarini, campionessa olimpica a Tokyo 2021, mentre numerose altre personalità di rilievo parteciperanno alla manifestazione. Tra queste, il Sindaco di Mantova Mattia Palazzi, l’Avvocato Paola Mari, Presidente del Telefono Rosa Mantova, il Vice Sindaco di Mantova Giovanni Buvoli, la Consigliera della Federazione Italiana Canottaggio Luciana Reale, e il Direttore Generale della Fondazione Banca Agricola Mantovana Luca Giovannini, insieme ad altri ospiti che contribuiranno a rendere ancora più significativa questa edizione di “Via le Mani”.

È autorizzata la riproduzione, anche parziale, sempreché venga citata la fonte www.canottaggio.org e/o i vari credit fotografici dei collaboratori della testata.

In general, the focal length and working distance of objective lens varies very little with wavelength and is usually not specified at a particular wavelength. At most, over a specified wavelength range, one could potentially see only microns of deviation, and this amount would be even smaller for apochromatic objectives.

L’appuntamento è quindi fissato per domattina, per sostenere la lotta contro la violenza di genere. L’intera manifestazione sarà trasmessa in diretta streaming sulle piattaforme della Federazione Italiana Canottaggio.

Many times microscope objectives with high magnifications will have very short working distances to the focused spot. Because of this short distance, if one is not careful while focusing in on the targeted specimen, the end of the microscope objective may "crash" into the object under study. These Long Working Distance Objectives are ideal to use when the application requires there be room between the objective and the target for other equipment like pipettes or syringes. These objectives have some of the world's longest working distances.

The thread on the long working distance objectives are M26, so the M26-RMS adapter is required to step down to standard RMS threads.  Please make sure to purchase one for use with any RMS mount such as the LH-OBJ microscope objective holder.

Infinity corrected objectives are used in a wide variety of imaging and laser focusing applications. Light rays leaving the objective’s rear aperture are collimated, so that for imaging applications, a secondary lens (usually called a tube lens) is needed in order to focus the collected light from the specimen onto the sensor. The labeled magnification is calculated, assuming the objective is being used with a tube lens of a particular focal length by design. When a tube lens of a different focal length is used, the magnification will need to be adjusted accordingly. As an advantage over finite conjugate objective lenses, a variety of auxiliary optical components, such as optical filters and polarizers can be inserted between the infinity objective lens and the tube lens without altering how the beam propagates and forms the image down the optical path. In laser applications such as optical tweezers and laser cutting, laser beams entering the rear aperture of an infinity objective can be tightly focused to a diffraction-limited spot, providing concentrated optical power and excellent resolution.

These objective lenses are an M Plan Apochromatic design which offers a flat field correction, long working distances and superior optical performance. These objective lenses offer some of the world’s longest working distances while providing a flat, chromatic aberration-free image throughout the entire field of view.

Salvo accordi scritti, le collaborazioni a www.canottaggio.org sono da considerarsi del tutto gratuite e non retribuite. La Direzione si riserva il diritto di modificare la titolazione degli articoli e di fare gli opportuni tagli redazionali al materiale pervenuto dando a questo l'impostazione grafica ritenuta più opportuna. Gli articoli firmati esprimono le opinioni degli autori e non hanno riferimento con gli orientamenti ufficiali. Tutto il materiale inviato, anche se non pubblicato, non sarà restituito.

Long Working Distance Microscope Objectives are designed around 426 to 656 nm to provide a chromatic aberration-free image with flat field correction. The objectives are called “Plan” because they produce the flat image across the field of view. The “apochromat” objectives provide chromatic correction for three wavelengths and spherical correction for two wavelengths. In the case of white light, plan apochromatic objectives offer superior images for color photomicrography than achromatic objectives can provide. In general, the focal length and working distance of objective lens varies very little with wavelength and is usually not specified at a particular wavelength. At most, over a specified wavelength range, one could potentially see only microns of deviation, and this amount would be even smaller for apochromatic objectives.

Choose products to compare anywhere you see 'Add to Compare' or 'Compare' options displayed. Compare All Close