More products from the brand :ASKAR

Gearbox 0.7x FRA600

CHF 399

Reference CORR-0013

Disponible en stock chez le fournisseur

Free delivery
Easy, free returns

Askar 3" F3.9 0.7x Reducer for FRA600 - Optimize your Astrophotography

Visit Askar reducer 3 inches F3.9 0.7x is designed specifically for the FRA600 astrograph, optimizing its capabilities for astrophotography and visual observation. Featuring a 4-element optical design, this reducer reduces the focal ratio and increases the field of view, meeting the needs of astrophotographers looking for increased brightness and speed when capturing large-scale celestial objects. This model is compatible with full-frame sensors, ensuring full image coverage without vignetting.

Askar 3-inch F3.9 0.7x gearbox specifications

  • Focal ratio reduction : The 0.7x reduction factor enables the focal ratio of the astrograph to be changed from f/5.6 to f/3.9, increasing brightness for shorter exposure times.
  • Reduced focal length : The focal length is reduced to 420 mm, ideal for deep-sky shots and the observation of large stellar fields.
  • Lens design : 4-element system optimized for sharp, aberration-free images, maximizing the quality of every shot.
  • Back focus : The rear focal length is an industry-standard 55 mm, ensuring compatibility with a wide range of astrophotography accessories.
  • Full-frame compatibility : Designed to work perfectly with full-frame sensors, eliminating vignetting and guaranteeing uniform image quality.

Dimensions and Technical Design

  • Outside diameter : 84 mm, offering a stable, solid structure for use with large equipment.
  • Total length : 76 mm, for compact mounting without cluttering the configuration.
  • Front thread : M90*1 female, for secure connection to the FRA600 astrograph.
  • Rear thread : M48*0.75, suitable for 2" filters for extended astrophotography possibilities and easy filter installation.

Benefits for users

This reducer is ideal for users looking to optimize their FRA600 astrograph for deep-sky astrophotography. Reduced exposure time and increased field of view enable faster, more effective capture of celestial objects. The integrated M48*0.75 thread facilitates the addition of 2" filters, making this reducer versatile for a variety of astronomical applications.

Products in the same category

Écran à flat GIOTTO 560
GIOTTO 560 flat screen
CHF 1'759
Platine Vixen et Losmandy OBSERVATORY
Platinum Vixen and Losmandy OBSERVATORY
CHF 379
Réducteur 0.8x APO103
Reducer 0.8x APO103
CHF 209
Platine Vixen et Losmandy MAXI
Platinum Vixen and Losmandy MAXI
CHF 435
Explore Scientific 1.25" 68° - 16 mm
Explore Scientific 1.25" 68° - 16 mm
CHF 159
FocusCube v2 C11 et C11 Edge
FocusCube v2 C11 and C11 Edge
CHF 299
Diviseur optique FHD-OAG MINI
FHD-OAG MINI optical splitter
CHF 209
Écran à flat GIOTTO 185
GIOTTO 185 flat screen
CHF 369
Motorisation ALTO-1 pour GIOTTO (120 à 220)
ALTO-1 motorization for GIOTTO (120 to 220)
CHF 499
Adaptateur M54/M48 pour Canon R (backfocus de 35mm)
M54/M48 adapter for Canon R (35mm backfocus)
CHF 59
Explore Scientific 1.25" 62° - 14 mm
Explore Scientific 1.25" 62° - 14 mm
CHF 109
Explore Scientific 2" 52° - 15 mm
Explore Scientific 2" 52° - 15 mm
CHF 89
Explore Scientific 2" 52° - 20 mm
Explore Scientific 2" 52° - 20 mm
CHF 89
Colliers Primaluce 131mm PLUS
Primaluce 131mm PLUS clamps
CHF 309
Sky Quality Meter (SQM) - LR
Sky Quality Meter (SQM) - LR
CHF 229
Réducteur 0.7x 107PHQ, 130PHQ, 151PHQ
Reducer 0.7x 107PHQ, 130PHQ, 151PHQ
CHF 399

Our new products

Player One Uranus-M
Player One Uranus-M
CHF 389
Télescope Newton StarSense Explorer 130DX
Télescope Newton StarSense Explorer 130DX
Celestron StarSense Explorer 130DX
Celestron StarSense Explorer 130DX
CHF 459
Celestron NexStar 6SE
Celestron NexStar 6SE
CHF 1'189
Monture Avalon M-Zero HQ Bluetooth avec trépied
Monture Avalon M-Zero HQ Bluetooth avec trépied
CHF 4'099
DayStar Quark - Calcium H-line
DayStar Quark - Calcium H-line
CHF 1'215
DayStar Quark - Magnésium I b2-line
DayStar Quark - Magnesium I b2-line
CHF 1'399
DayStar Quark - Sodium
DayStar Quark - Sodium
CHF 1'215
DayStar Quark GEMINI combo "Deux-en-un" pour SCT et Mak - Chromosphere et Prominence
DayStar Quark GEMINI two-in-one combo for SCT and Mak - Chromosphere and Prominence
CHF 2'380
DayStar Quark combo (pour SCT, Mak, Lunette >F/15) - Chromosphere ou Prominence
DayStar Quark combo (for SCT, Mak, Lunette >F/15) - Chromosphere or Prominence
CHF 1'215
[category_menu_mobile]