Meade f/6.3 Series 4000 Focal Reducer/Field Flattener

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Meade f/6.3 Series 4000 Focal Reducer/Field Flattener
$99.99
Item # ME-07545
OR
  • The Meade 0.63 Focal Reducer & Field Flattener screws onto the rear cell of SCT's, converting f/10 scopes to f/6.3 or f/6.3 scopes to f/4.
  • Reduces photographic exposure times by approximately 50%.
  • The Meade 0.63 Focal Reducer & Field Flattener 41mm-diameter lens system helps flatten the field of Schmidt-Cassegrain models, significantly improving edge-of-field corrections.
  • Not for ACF optical systems as field correction is not needed.
Description

Details

Meade f/6.3 Focal Reducer & Field Flattener

Threaded on to the telescope's rear cell, the f/6.3 Focal Reducer/Field Flattener reduces the main telescope's focal ratio by a factor of 0.63 (e.g. from f/10 to f/6.3). It can be used for visual work when the user desires a wider field of view, or when placed in front of a CCD imager, #62 T-Adapter or Off-Axis Guider and camera body, the f/6.3 reducer produces photographic exposure times by about 50%. Designed primarily for f/10 and f/15 LX-series models, the Focal Reducer can also be used photographically and in CCD imaging applications with f/6.3 SCT's, resulting in an effective focal ratio of f/4.

An important advancement in high-resolution focal reduction systems, the Meade 4-element, multi-coated f/6.3 Focal Reducer/Field Flattener threads on to the rear cell of any LX90, LX200 or other Schmidt-Cassegrain or Advanced Coma-Free model and is typically used with an Off-Axis Guider or T-Adapter. Reduces the telescope's focal ratio by a factor of 0.63: f/10 telescopes are converted to f/6.3. Simultaneously, the 41mm-diameter lens system helps flatten the field of Schmidt-Cassegrain models, significantly improving edge-of-field corrections.

This handy accessory enables a reduction of photographic exposure times by about 50%, while producing an actual field diameter of 1.5" at the film plane. Use of this focal reducer is not recommended for 35mm photography or larger CCD chips with Meade Advanced Coma-Free (ACF) models as field correction is not needed.

Meade Product Number: 07545

Additional Information

Additional Information

SKU ME-07545
UPC Code 709942001846
Manufacturer Meade
Barrel Size Thread-on
Warranty 1 Year Warranty
Reviews

Customer Reviews 3 item(s)

Great for the Money But Needs to be used on a Old Style SCT and not ACF or HD Telescopes.
First of all this accessory is not desgined to be used on a ACF or EdgeHD Telescope. These scopes already have either a field flattener installed in the baffle tude or have a other type of field flattener incorporated into the optical train. Now if this accessory did not have the Flattener then it will work on these types of scopes. Again its not fair to judge it on the basis of being used on a ACF or EdgeHD scope since they already have field flatteners in them this device over corrects and causes optical defects.

I have used the Meade of my CPC 1100 with great sucess and the stars are tack sharp as they are on the Anteres. The CPC is a conventional SCT and NOT an aplanatic desgin. That is the reason they work so well on this type of scope. I used CCD and DSLR on the CPC and the focus was dead on. If you have a Classic SCT use this or the Anteres of you own an aplanatic SCT do not use them for they will not work on them.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Garry / (Posted on 2/9/2011)
focus problem, deformed stars
I bought this reducer on november of 2007 at OPT, i agree with Mike. It canĀ“t reach focus with a 2 OPT diagonal. Astrophotos always show deformed stars. I have tested with diferents distances between the Reducer and camera chip.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by douglas / (Posted on 7/18/2009)
Meade vs Antares comparison
I recently had the opportunity to compare the Meade f/6.3 Series 4000 Focal Reducer/Field Flattener with the Antares f/6.3 SCT Reducer/Corrector.

The Meade focal reducer comes in a small box. Inside the box is a bottle style case and a two-sided instruction sheet. Inside the case is the focal reducer with caps on both ends.

With a 2000mm focal length f/10 telescope like a 8 SC or 8 ACF, both the Antares reducer and the Meade reducer should yield a 1260mm focal length f/6.3 telescope. This makes the telescope a faster system with a wider field-of-view and brighter objects, requiring shorter exposure times when doing astrophotography.

I had some focusing problems with the Meade focal reducer on both an 8 LX90-ACF and an 8 LX200-ACF whether using eyepieces or my Nikon D70 DSLR camera. This surprised me, given that the Antares f/6.3 SCT Reducer/Corrector focused just fine. I also noticed an image size difference between the Meade and Antares focal reducers when using the same setup. When I attached an Off-Axis Guider, the guide eyepiece field-of-view was very restricted, making guide-star selection almost impossible. The Antares reducer had no eyepiece field-of-view restriction.

For visual work, the Meade reducer worked OK, when I could reach a focus. The expanded field-of-view and the increased brightness of objects really added some enjoyment to the viewing. Some minimal distortion was evident at the edge of the field-of-view but it was not distracting.

One thing to keep in mind when using a focal reducer with an Altitude/Azimuth fork-mounted telescope is the eyepiece/camera clearance from the base. I found that the maximum elevation on the LX90 and LX200 can vary from 90 degrees to less than 65 degrees, depending on the accessories used.

Based on my photographic and visual tests, I prefer the Antares focal reducer over the Meade focal reducer. The Antares focused in all my test scenarios whereas the Meade focal reducer had problems reaching a focus with most of my accessories. The physical and optical quality seemed to be essentially identical for both but the Antares model is somewhat less costly.

It should be noted that I received a couple of reports that a bad batch of Meade focal reducers was shipped in 2007. Perhaps mine is one of that batch, and that would explain the focusing problems.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Mike Weasner / (Posted on 10/30/2008)
Included Items

Included Items

  • Meade 0.63 Focal Reducer & Field Flattener
  • One Year Manufacturer Warranty
Questions & Answers

Product Questions

Will this work with the 10" LX90 ACF?
What is the Focal Length (mm) and Focal ratio to focal Plane in mm?
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