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Phase contrast microscopy requires special phase contrast objectives and a special phase contrast condenser. This technique is useful for observing unstained specimens that lack a color (eg. bacteria). The optics will convert the differences in refractive index of the specimen into brightness differences. This will cause transparent object to appear brighter or darker than their background. Phase contrast is expensive but sometimes necessary to see certain structures in living and unstained cells.

ComEd is sponsoring a limited number of discounted Illumination tickets. Receive a $5 discount on Illumination tickets by using the code 2024COMEDLIGHTS, while supplies last. Supply is limited and guests are encouraged to get their tickets using this code as soon as possible once tickets go on sale October 15. Arboretum members are not eligible to use the discount code, as members already receive the best price on all Illumination tickets. The discount code is not valid for Electric Illumination, IllumiBrew, or the Illumination Sensory Night. If the code does not apply the $5 discount during checkout, those tickets are sold out.

The amount you save varies, but the prices listed for each date will always be the lowest option at that time, for that particular date. Prices will never decrease but they may increase, so buying ahead is always your best option.

Suitability for amateur microscopy: High. Rheinberg filters can be made by yourself either by using a color printer or by applying nail polish of different colors on a transparency foil. Some experimentation is needed to find the ideal color combination and intensity. Watch the video at the end of this post.

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Suitability for amateur microscopy: High. This technique is highly recommended due to its ease of use, low cost and strong visual effect.

Darkfield microscopy shows the specimens bright on a dark background. Brightfield microscopes that have a condenser with a filter holder can be easily converted to darkfield by placing a patch stop filter into the filter holder. The filter blocks the direct light of the microscope. The specimens appear bright, because they reflect the light from the microscope into the objective. One disadvantage of darkfield is that it is very sensitive to dust. A small amount of dust will already light up on the dark background.

You can change the date or time of your visit after purchasing tickets. Changing the date of your ticket will be subject to a $1 fee, plus any applicable changes in the price of tickets at the time of the change.

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Choose the price, date, and time that best matches your budget and schedule. The further in advance you purchase your tickets, the more you save.

The best way to save on Illumination is to purchase tickets in advance. Ticket prices may go up based on availability and demand, but they will not go down. You can ensure you get the lowest price by buying tickets now.

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Arboretum members always save an additional 20% on Illumination tickets. Members also have access to purchase Illumination tickets two weeks ahead of the public. Become a member to get the best price on Illumination tickets.

Good news! There is a very easy (and cheap!) possibility to imitate DIC. The resolution is not quite as high, but the results can be quite nice looking as well. Oblique illumination can be achieved in two ways: You can insert a darkfield filter into the filter holder and then partially swing out the filter. You can also make oblique illumination filters out of cardboard, which block the light on one side. In both cases the light strikes the object from the side which causes some structures to stand out better, as if casting shadows. Watch this video for more information on darkfield and oblique illumination.

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Polarization microscopy also produces a bright specimen on a dark background. It can also be easily improvised with a brightfield microscope. A polarizing filter is placed above the lamp and another one is placed between the specimen slide and the objective. Parts of the specimen will then light up. Optically active crystals on the slide will produce nice colors.

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2016924 — Diffused light is light that passes through a material that softens it and spreads the light out. This may be diffusion gel, a frosted window or cloth.

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Suitability for amateur microscopy: Medium. You need phase contrast  microscope objectives and a corresponding phase contrast condenser. Only the better microscopes of some manufacturers allow for an upgrade to phase contrast and this can be expensive.

Differential Interference Contrast (DIC) is an advanced technique that produces very striking and attractive images. The images look three dimensional and seem to have depth. There is no real stereoscopic view, of course, but the structures seem to cast shadows, and seem to stand out. For DIC you need a combination of polarizing filters, and prisms. It is offered only by few high-end microscope manufacturers and there is (to my knowledge) no possibility of a DIY solution.

Arboretum members receive the lowest ticket prices for all dates and times, with a 20% discount on all Illumination tickets.

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Suitability for amateur microscopy: Low. This is primarily due to the high cost. You need fluorite objectives, DIC prisms, a very bright light source and these are only offered by a handful companies.

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Through the Arboretum’s participation in the Museums for All program, a limited number of reduced-rate Illumination tickets will be available on select dates for guests with a state-issued Electronic Benefits Transfer (EBT, P-EBT or LINK) card, or a valid WIC card. Up to 10 Museums for All tickets can be purchased. When buying tickets online, a valid LINK or WIC card is required to receive the discounted rate. Online ticket purchasers will receive an email confirmation and must show a valid LINK or WIC card with their tickets at the entrance on the night of the event.

I also talk about Polarization, Oblique illumination, Rheinberg Illumination, DIC, and fluorescence microscopy. These are all contrast-enhancement techniques in light microscopy.

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Suitability for amateur microscopy: Low. You need a microscope with UV light, but this is not all. You need to label your specimens with fluorescent antibodies. This is something that is reserved for laboratories.

All of them are used by compound light microscopes and all specimens can be viewed with them, but with possibly different success. Some specimens are suited more for one type, others better for the other type.

Optical staining techniques in microscopy enhance the contrast, by making use of (among other things) the natural differences of refractive index of the specimen with the surrounding medium. I here want to give you an overview of different microscopic techniques that can be used to increase contrast. Many of these are suitable for amateur microscopy and variations of the same concept (Darkfield, Rheinberg, Oblique), while others require specialized optics (Phase Contrast and DIC), and yet others access to antibodies for preparing the specimen (Fluorescence). Still others make use of ability of some specimens to polarize light (polarization microscopy). Especially some crystallized structures are capable of that. Visit the Microscopy Shop! >>> USA Shop | Germany Shop | UK Shop | Canada Shop <<< As an Amazon Affiliate, I earn a commission but it does not cost you more.

Using the Backlight Correction feature in your scanning software, you can remove shadows from photos that have too much background light.

Bright field microscopy is the conventional technique. It is suitable for observing the natural colors of a specimen or the observation of stained samples. The specimen appears darker on a bright background. In order to increase the contrast, one should close the condenser. This will reduce the resolution, but there is a positive trade-off. Diffraction increases and the edges of the specimen becomes darker (even though they are not in reality). These are artifacts, but it makes difficult to see specimens more visible (eg. bacteria).

Suitability for amateur microscopy: High. Bright field microscopes can be easily modified. Insert a polarizing filter into the filter holder and put a second one over the slide. Rotate the top filter until you get the best results. See the video at the end of this post on how to do that.

Suitability for amateur microscopy: High. If your microscope has a condenser with a filter holder, then it is easy to convert a brightfield microscope to darkfield. You need to insert a (home-made) darkfield patch-stop filter.

There are a variety of techniques in microscopy to enhance contrast. This is important because in many cases specimens are quite transparent and therefore difficult to see. They lack contrast with the surrounding medium. While it is possible to stain them with a variety of chemicals, these might harm the cells. Staining therefore (in most cases at least) will result in dead organisms, either by the staining itself or by the required preparation steps, such as heat-fixing of bacteria.

Rheinberg Illumination is a variation of darkfield. Here the filter does not completely block out the light but changes the color of the light. Rheinberg filters can be made at home, either by printing them on a transparency foil or by using nail polish.

Yes. Arboretum members always get the lowest prices for the day and time they choose. Member ticket prices are always 20% lower than tickets for the public on the same day and time. Members will be asked to verify their membership before purchasing tickets.

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Prices for Illumination vary based on the day and time. Plan-ahead pricing allows you to get the best deal on Illumination tickets when you buy in advance. The further in advance you purchase tickets, the more you save.

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The microscope lamp makes Ultraviolet (UV) light, which comes from the top through the objective. Those structures of the specimen that are labeled with fluorescent antibodies start to light up. By using the correct antibodies you can make different structures of the cell light up. From a scientific standpoint, this is a very powerful technique. But at the same time, it is very unsuitable for hobby use. Unless you work in a lab, where you have access to the equipment (and the antibodies….).