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Astromania 0.5X Reducer for Photography and Observing
This reducer halves the focal length of your telescope, giving you a much wider field of view. You can use this, for example, for doing astrophotography by using an astronomy webcam.
Apply to : 0.5x reducer for screwing into a 1.25'' filter thread, more lens speed.
Using for : Increase the image field of your web camera, use the reducer visually with an eyepiece, also ideal for video astronomy.
Astromania 0.5X Reducer for Photography and Observing
- Free Light Transmission
22.5mm lens aperture. Can be used with additional spacers (available separately) to achieve further focal reduction.
- The simple way to increase your webcam's field of view
Screw the Astromania reducer into the filter thread on your camera and so double the size of the photographic image field. This lets you take images of much larger areas of the lunar surface, for example. The reducer is also great for taking videos of the Moon using your webcam. You can obtain even larger image fields with your astronomy webcam if you attach an extension tube (e.g. 25mm) between the reducer and camera.
Our Expert Comment:
- The reducer is useful for 0.25 to 0.5 inch chips (webcams, DMK, Watec) and focal ratios from f8 (refractors, Maksutov and SCs). It needs about 5cm of back focus. The result an f4 to f6 optical system. The reducing effect can varied by using the distance from the chip, e.g. by filter rings.
- The reducer is unsuitable for DSLRs and large CCD cameras as the chips are not completely illuminated.
The advantages in a nutshell:
- 0.5X reducer for screwing into the filter thread
- Expands the image field of your webcam
- More light intensity
- Can be used visually with an eyepiece
- Also optimal for video astronomy
- take images of larger areas of the Moon's surface
melissa
2025-08-26 13:04:53
Worked as it should. Made of good quality materials
Dennis R Price
2025-08-12 10:09:42
Works well. Well machined threads. Allows for full view of sun with solar filter or moon with 8†sct.
Curious Customer
2025-08-01 10:05:07
As advertised, reduced image so I could capture full moon image with my current imager and configuration.
Tom Ligon
2025-06-27 15:41:01
I have three of these from various makers, and they are coming in handy. When setting up a scope you probably want a very wide field view to find stars for lining up your sight. Pop one of these on your highest number eyepiece. The downside is that these may not give great field flatness, possibly producing strange flare effects. Handy, but no substitute for a really high quality field flattener if you are going for wide angle views.
Robert R.
2025-06-15 12:17:02
Great clarity and design just not great for celestron 8se if you want to use a Barlow or anything that is going to add to much length. It pushes the focus on the 8se right to the edge of maximum adjustment. So I cant use my barlow or my lens filter wheel because I run out of focus adjustment.
SB Outdoors
2025-06-08 13:29:12
I got this .5X reducer to use with my Celestron 127 SLT telescope - it is a Maksutov Cassegrain telescope. The problem I was trying to solve for is that without the adapter, the sun and moon fill the screen when my camera is attached, so I am unable to capture the images showing the full moon and sun without them being close to the edge of the photos, and they get cropped in videos.This .5X reducer alone did not work - not a fault of the reducer, it is simply how it works with my telescope. When attached to the camera adapter and inserted into the telescope, the telescope would not focus. I had to additionally purchase an extension adapter to move the camera further away from the telescope to attain focus. This combination worked beautifully. The reducer did indeed widen the field of view as I wanted. I tested during the day and was able to figure out just where my focus ring needed to be adjusted.Then back out at night, everything was set but when it was time to take photos, I could not get rid of the halo around the moon. I tried adjusting the exposure on the camera and nothing worked. I also double checked to be sure that the reducer was clean of fingerprints or any smudges, etc. I'm including photos of the moon with and without the reducer to show the difference.
Andrew O
2025-02-27 10:59:06
This is an excellent reducer. I use this with my Celestron CPC 800 (f10) and Nikon D3300 DSLR and calculated that I get about 0.6x reduction based on the field of view. You also need a Celestron T adapter and camera-specific T ring to connect the telescope to your camera. These should give a proper back focus. I’m able to get perfect focus (using Bahtinov mask) and I don’t see any distortions of star shapes. It’s nice to be able to have a wider field of vision and faster light acquisition compared to DSLR without reducer.
Tswoodshop
2025-01-23 10:24:23
I'm using this on my Celestron 8" Edge HD. I enjoy astrophotography, and wish I had more time to do that instead of spending time in my woodshop, or up on my electronics bench. We pic our poisons! It's actually pretty rare that I need a reducer, but for some shots, like taking in a huge part of the sky at once, as when photographing the milky way, a reducer works great. This one is relatively inexpensive compared to others I have. However, it's just as crisp and clean, with very little edge distortion. This one is a winner, especially if you're on a budget. Five stars.
Nette W.
2025-01-15 11:44:54
Für diesen Preis tut es wirklich was es soll, sitzt perfekt an meinem C8 und vergrößert das Gesichtsfeld so, als hätte ich einen 2" Adapter mit einem 32mm Okular dran. Aber dabei gestaltet sich der Anblick viel schärfer, denn durch das 2" Okular kommt eine miminmale Unschärfe herein, wegen der etwas grösseren Aufhellung.
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