Gerd Neumann jr.

Astronomik Filter Clip System (for Canon EOS cameras)

Do you have a Canon EOS digital camera (300D, 350D, 400D, 20D, 20Da, 30D, 40D (please specify 40D at your order!)) and also use it for astro-imaging? Then you have surely encountered the following problems:

• Large filters for large camera lens objectives are very expensive
• If you place a filter holder between your camera body and lens you loose the ability to focus to infinity
• For very fast (low f/ number) telescopes like the Vixen R200SS or the Takahashi “Epsilon” astrograph. a filter drawer or a filter wheel cannot be used since the distance to the corrector lenses would be changed
• With long exposure times your camera’s sensor chip is exposed to more dust
  

With the Astronomik EOS Filter Clip System you can immediately take care of all of these problems!

The patented Astronomik EOS Filter Clip System is black anodized aluminum and laser-cut on state-of-the-art modern machines. It can be inserted within seconds directly into the EOS camera body. There are no changes necessary and all lens functions (focus, screen, image stabilization) remain functional!

Almost all Canon system lenses (with the exception of the EF-S series) and all M42 and T2 lens adapters, can be used with the Astronomik EOS Filter Clip System. The EOS Filter Clip System also acts as an outstanding dust shield, which prevents the possibility of dust settling on the sensor during long time exposure (The MC-Clearf does not have a filter effect and only acts as a dust shield.)

FAQ for the Astronomik Filter Clip System

Inserting the Astronomik EOS Filter Clip System

Removal of the Astronomik EOS Filter Clip System

Astronomik EOS Filter Clip System for Canon EOS cameras All Astronomik filters are available in each EOS Filter Clip System (see list left) Supplied in a high-quality filter box

Kind. - NR.: see table left above

Questions and answers for the Astronomik EOS Filter Clip System:

Question:
Can I use my existing 1.25 " or 2 " eyepiece filters in the Astronomik EOS Filter Clip System?

Answer:
This is not possible since the clamp has no threads. The Astronomik EOS Filter Clip System is only 2mm thick, including the integrated filter, and is therefore not compatible with conventional screw threaded filters.

Question:
Does the lens autofocus still function with the Astronomik EOS Filter Clip System installed?

Answer:
Yes, autofocus, exposure measurement, and image stabilization control functions are still useable. The Astronomik EOS Filter Clip System does not limit any of these functions.

Question:
How is the EOS Filter Clip System in the housing of my Canon DSLR fastened? Must I make any camera body modifications?

Answer:
The Astronomik EOS Filter Clip System can be inserted without any changes to the housing of your Canon DSLR. No tools are necessary ­ you simply insert or remove with your fingers.

Question:
When I use the EOS Filter Clip Systems do I still have to make other modifications to my Canon EOS digital camera for astro-imaging? Specifically, removing the camera’s OEM IR-blocking filter over the sensor?

Answer:
The Astronomik EOS Filter Clip System does not have anything directly to do with a digital camera’s “IR-band blocking filter”.
Regular photographic digital camera sensors have a very small sensitivity in the H-alpha line portion of the spectrum which is bad for regular photographs but very important for astro-imaging. Hence, Canon sells it’s cameras with an internal “IR-blocking filter” over the sensor to remove the over abundance of ‘red’ due to Infrared from ordinary photos.
For astro-imaging, sensitivity in the red (the H-alpha line) is desired and is achieved by the removal of the camera’s internal IR blocking filter.

The EOS Filter Clip System has no idea if Canon’s IR-blocking filter is installed or whether it has been removed. The Filter Clip System can be used with both converted and with un-converted cameras with equal results.. (While the idea of not having to remove the IR-blocking filter in the first place would be welcomed, a filter used in front of the lens which increases IR red sensitivity is not available yet!... )

Question:
Can I use my regular camera lenses with the Astronomik EOS Filter Clip System?

Answer:
Yes, you can use all the normal Canon EF bayonet lenses, either Canon OEM or non OEM such as Tamron, Sigma, etc.. All lens functions will remain operational.

Question:
I have some the EF-S lenses for APS format sensor cameras. Can I use these together with the Astronomik EOS Filter Clip System?

Answer:
No. Unfortunately the EOS Filter Clip System does not function with the EF-S series lenses. The EF-S series lenses extend further into the camera so that it is not possible to fit a filter between the lens and the camera.

Question:
Can I use the Filter Clip System with my EOS/T2 and 2 " adapters to the telescope?

Answer:
Yes, that is possible! In this case there are no restrictions. First insert the EOS Filter Clip System into your camera and then install the desired lens adapters. The EOS Filter Clip System fits in such a way that it cannot unintentionally fall out. At the same time, the integrated filter represents an outstanding dust shield for the sensor during long time exposures.