Pre-order: DWARF 3

Buy one, get one 25% off - Alpen Optics

Explore Scientific  |  SKU: FFFR507X-00

Explore Scientific 3" Field Flattener .7x Focal Reducer

$479.99 $575.99

Earn [points_amount] when you buy this item.

Shipping & Returns

We offer free US standard shipping on orders over $99 and 30-day returns on most items. Some limitations apply.

Shipping Policy

30-Day Return Policy

Explore Scientific 3" Field Flattener .7x Focal Reducer

 

Features

  • For Astrophotography and Astro-Imaging
  • Compatible with 3" Focusers
  • Corrects for Spherical Aberration
  • Reduces the Focal Ratio by 0.7x
  • Fully Multi-Coated Optics

 

Explore Scientific’s 3-inch Field Flattener/0.7x Focal Reducer is a multi-faceted accessory designed to enhance your astrophotography experiences. As a field flattener, this piece addresses the edge-of-field aberrations caused by curved focal planes to ensure your night at the eyepiece will result in crisp, true images.

As a focal reducer, this device will reduce your f-ratio by 0.7, which results in a wider field of view, brighter images and less exposure time. Recommended for our 127mm and 152mm refracting telescopes (excluding our doublet refractors), this field flattener/focal reducer boasts fully multi-coated optics.

This item comes with a threaded adapter that threads onto the Explore Scientific 2-inch rack-and-pinion focuser. Threaded attachment to a 2.5-hex focuser, which comes stock on our 127mm APO telescopes, requires purchase of an additional adapter. 

The field flattener/focal reducer offers 55 mm of back focus from the rear face of the device. The M42x0.75 adapter adds 3 mm, so the sensor needs to be 52 mm from the face of the adapter.

To connect to the 2.5 hex focuser, purchase item number 510366.

While technically this was designed for the f/8 system, through user experiences and our subsequent testing we have concluded that our 3-inch field flattener/reducer performs very well with our f/7.5 refractors.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Meta Pay
  • Google Pay
  • Mastercard
  • Shop Pay
  • Visa

Your payment information is processed securely encrypted during transmission. We do not store credit card details nor have access to your credit card information.

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)

Questions & Answers

Have a Question?

Be the first to ask a question about this.

Ask a Question
Explore Scientific 3" Field Flattener .7x Focal Reducer | FFFR507X-00 | 812257014408

Explore Scientific 3" Field Flattener .7x Focal Reducer

$479.99 $575.99

Magnification

-

Aperture

-

Focal Length

-

Focal Ratio

-

Field of View

-

Optics

-

Barrel Size

3"

Dimensions

90.1mm height

78.3mm diameter

Weight

1.4 lbs | .64 kg
View product