Que peut-on photographier avec la Takahashi FC-100DC ?

La Takahashi FC-100DC est une lunette doublet à lentille en fluorite de 100 mm d'ouverture pour 740 mm de focale (f/7,4), pensée d'abord pour l'astrophotographie du ciel profond. Sa focale vise les galaxies (M51, M101, le Triplet du Lion), les nébuleuses planétaires comme M27 et les amas globulaires, avec un bon niveau de détail. À f/7,4, son rapport classique demande des poses un peu plus longues, en échange d'étoiles très fines.

Quelle caméra lui associer ?

Avec une caméra APS-C à pixels de 3,76 µm (capteur Sony IMX571), vous obtenez environ 1,05″ par pixel pour un champ de 1,8° × 1,2°.

Faut-il un aplanisseur ou un réducteur ?

Oui, dès qu'on vise un capteur APS-C ou plein format : comme toute lunette doublet non corrigée, elle a une légère courbure de champ qui allonge les étoiles dans les coins. Les correcteurs dédiés : Takahashi TKA00582 : correcteur FC/FS MFL 1,04x .

Quel backfocus faut-il respecter ?

161 mm (metal back) ; 71,2 mm avec MFL 1,04×. Ce tirage se mesure du filetage jusqu'au capteur, bagues, roue à filtres et tiroir compris : le respecter au millimètre près garde des étoiles rondes dans les coins.

Quelle monture prévoir ?

Le tube pèse environ 2,8 kg ; avec la caméra, la roue à filtres et le guidage, comptez autour de 4,3 kg : une monture de la classe HEQ5-R Pro offre une bonne marge. Une lunette ne demande aucune collimation : une fois équilibrée, elle est prête dès qu'elle est à température. Avec 81,5 cm de long, elle demande un coffre de bonne taille.

Peut-on aussi l'utiliser en visuel ?

Oui, en bonus : avec un renvoi coudé et un oculaire, elle offre des images contrastées et sans fausses couleurs sur la Lune, les planètes et les étoiles doubles, jusqu'à environ 200×.

Takahashi FC-100DC - lunette fluorite 100 mm tube seul

Name: Takahashi FC-100DC - lunette fluorite 100 mm tube seul
Brand: Takahashi
SKU: TFK10010
Price: 2098.00 CHF
Availability: BackOrder

Product description

An FC-100DC for observing and photographing the sky

The Takahashi FC-100DC combines a 100-mm apochromatic objective with a native focal length of 740 mm, for an f/7.4 ratio. The air-spaced doublet features an internal fluorite lens and is coated with a hard multicoating.

Focus and Size

The compact rack with a 31.75 mm lead comes from the FS-60CB. Takahashi intends this version primarily for visual observation, with the option to use small cameras and compatible photographic accessories. The dew shield is fixed.

Photo montage

The 76D-FL corrector, the FC/FS multi-flattener, and the 76D-RD reducer are available as options. The selection of rings and the distance to the sensor follows the specific diagram for the telescope and the selected corrector.

Delivered Contents and Assembly

FC-100DC TFK10010 optical tube with lens and focuser. The finder scope, its mount, and the mounting collar must be purchased separately for this tube-only configuration.

Choose a mount that is compatible with your equipment, and check that the assembly is balanced and securely fastened.

Takahashi FC-100DC Documentation

Accessories for Your System

Collar for FC-76DS/FC-100/FSQ-85EDX (95 mm diameter) (TKA21420) : optional accessory, sold separately.
1.04x Multi-Corrector No. 80N for FS-60CB/FC-76/FC-100 (TKA00582) : optional accessory, sold separately.

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Frequently asked questions

What can you photograph with the Takahashi FC-100DC?

The Takahashi FC-100DC is a 100-mm-aperture fluorite doublet refractor with a focal length of 740 mm (f/7.4), designed primarily for deep-sky astrophotography. Its focal length is ideal for observing galaxies (M51, M101, the Leo Triplet), planetary nebulae such as M27, and globular clusters, with a good level of detail. At f/7.4, its classic aperture-to-focal-length ratio requires slightly longer exposure times, but in return delivers very fine star points.

Which camera should I pair it with?

With an APS-C camera featuring 3.76 µm pixels (Sony IMX571 sensor), you get approximately 1.05″ per pixel for a field of view of 1.8° × 1.2°.

Do you need a leveling device or a reducer?

Yes, whenever you're using an APS-C or full-frame sensor: like any uncorrected doublet lens, it has a slight field curvature that stretches the stars in the corners. Dedicated correctors: Takahashi TKA00582: 1.04x MFL FC/FS Corrector.

What backfocus should be used?

161 mm (metal back); 71.2 mm with a 1.04× MFL. This focal length is measured from the thread to the sensor, including the rings, filter wheel, and filter drawer: adhering to this measurement to the nearest millimeter ensures that stars remain round in the corners.

What kind of frame should I choose?

The tube weighs about 2.8 kg; with the camera, filter wheel, and guide scope, expect it to weigh around 4.3 kg: an HEQ5-R Pro-class mount provides plenty of headroom. A refractor requires no collimation: once balanced, it’s ready to use as soon as it reaches operating temperature. At 81.5 cm long, it requires a decent-sized trunk.

Can it also be used as a visual?

Yes, as a bonus: with an angled mirror and an eyepiece, it provides high-contrast, color-accurate images of the Moon, the planets, and double stars, up to about 200× magnification.

Technical specifications

Optical type: Apochromatic bezel
Diameter: 100 mm
Focal length: 740 mm
Focal Ratio (f/D): f/7.4
Maximum magnification: 200 ×
Separating power: 1.16″
Lens holder: 1.25-inch rack
Backfocus: 161 mm (metal back); 71.2 mm with 1.04× MFL
Corrector / Reducer Available: Yes
Conversion tools / reducers in-store: Takahashi TKA00582: 1.04x MFL FC/FS Corrector
Tube length: 81.5 cm
Tube weight: 2.8 kg
Uses: Visual, Planetary, Deep Sky, Astrophotography, Travel

Recommended Products (7)

How to Care for Your Instrument

Here are a few accessories we've selected for this model, depending on your needs.

Takahashi TKA00582: 1.04x MFL FC/FS Corrector

FC/FS 1.04× corrector for the FC-100DC, an alternative to the 76D reducer. Be sure to use the CA-100 TKA19203 Multi ring and check the connections and focus.

CHF 207.51

Add to cart

Takahashi 76D RD: Focal Reducer for FC Telescopes

76D Reducer for FC-100DC: 540 mm at f/5.4 and a specified image circle of 30 mm. An alternative to the 1.04× corrector; check the sensor format, mounts, and focal length.

CHF 436.40

Add to cart

Takahashi 95S: 95-mm one-piece clamp

Takahashi 95S collar for the 95 mm tube; choose the one that fits your mount. Check the mounts and balance; the dovetail is not included as advertised.

CHF 148.73

Add to cart

Takahashi TKA00595 - Extender-Q 1.6× Kit

Extender-Q 1.6× to increase the focal length and magnification. Check the connections according to the Takahashi diagram; the 50.8 mm TKA00596 adapter may be required depending on the mount.

CHF 384.75

Add to cart

PrimaLuceLab 120 mm Anti-Fog Heater

120 mm heating strip for a 124 mm defogger. Check its location and clearance; a 12 V power supply or controller with an RCA connector and sufficient power must be provided separately.

CHF 70.64

Add to cart