Modified Canon Digital SLR Astro Cameras.

Hutech now offers Canon digital SLR cameras which have been spectrum enhanced to make
full use of the bandwidth of the Canon CMOS sensor through the use of custom designed
filters. New models include the consumer level 10-megapixel XTi (400D), 450D, and the pro 8-
megapixel 30D and 40D. Older models have included the 6-megapixel Digital Rebel (300D)
and 8-megapixel Digital Rebel XT (350D), as well as the professional level 8-megapixel 20D.

Enhancement Options
Two basic options are available at the time of order:

Canon IR filter removed completely
Enhanced filter sets installed

No-filter Option

With the first option, the standard IR filter is completely removed, allowing the full sensitivity
to be utilized. This is fine for a totally dedicated scientific application where the camera's
autofocus or daylight white balance functions are unimportant. This option is recommended
only where reflective optics or lenses which have been corrected for the IR are used, or in
conjunction with an external band-limiting filter. Please note that camera lenses will not focus
at infinity with this option.

Enhanced Filter Set Option

The Hutech enhanced filters consist of a permanently mounted rear filter (RF) which replaces
the standard Canon IR filter, mounted close to the imaging sensor.

The second part of the enhanced filter set consists of an optional front filter (FF) in a holder
mounted in front of the camera's viewing mirror. This filter may be easily changed by the user.

Rear Filter Details

The rear filter (RF) exactly matches the light path of the standard Canon IR cutoff filter that it
replaces, enabling the camera's autofocus (AF) to work properly. Options are a Clear filter, or
Type I bandpass filter. Both filters are fully anti-reflection (AR) multicoated and have been
designed by IDAS, utilizing the UFP and IGAD technologies to insure undegraded and
extremely durable optical performance.

Clear filter - This passes all bands (including IR) and includes a fully multi-coated anti-
reflection (AR) coating effective between 380 and 1000 nm. This allows the user to fully utilize
the sensor's sensitivity into the IR band, but requires an IR blocking filter to be inserted at the
front-mounted position for most "normal" use.

Type Ib filter - This UV/IR blocking filter allows the astronomically important H-alpha to be
recorded, and is the most cost-effective way to adapt the Canon digital cameras for
astronomical use but does not allow for IR photography. It features a very sharp cutoff at the
band edges to insure that reflections between the filter and image sensor are minimized. An
additional filter in the front-filter position or the camera's custom white-balance function may
be used to achieve proper color balance for non-astronomical photography.

Front Filter Details

The front filters come mounted in a holder designed by Hutech which sits between the
camera's lens bayonet and the viewing mirror. Front-mounted filters do not affect the camera's
autofocus operation but, when installed, preclude the use of Canon EF-S lenses or some
lenses designed for APS-C sized sensors. These filters also affect the closest focusing
distance for each lens. Front Filters are fitted by the user as NO modification to the camera
is required. An alternative is to use a conventional front-of-the-lens type screw-in filter. VLC
filters are available in 58, 67, and 77 mm sizes.
These filters need not be specified and ordered at the time of purchase of an enhanced
camera.

Astronomical Applications:

LPS-P2 - Same as IDAS LPS-P2 externally mounted filters
LPS-V3 - 1.05 Nebula enhancement filter passing comet C2, H-alpha, H-beta, and OIII lines
while blocking light pollution sources, yet allows for natural color balance corrections. A
separate UV/IR blocking filter or LPS filter is recommended for complete cutoff of the UV and
IR regions.
UIBAR - 1.05 Same as the rear-mounted UV/IR blocking filter.
H-alpha - 1.05 Bandpass is 8 nm FWHM, with a unique flat topped and off-centered passband
to accomodate off-axis targets. A separate UV/IR blocking filter or LPS filter is recommended
for complete cutoff of the UV and IR regions.
HEUIB - 1.40 This is a daylight-balanced filter which still allows for H-alpha transmission. This
allows the Canon 20D auto-white-balance (AWB) and internal color balance adjustment
feature to be used for normal daylight photos. When used with the 300D, the custom white
balance (CWB) must be used for daylight photos.

Daylight Photography:

HEUIB - This is a daylight-balanced filter which still allows for H-alpha transmission. This
allows the Canon 20D auto-white-balance (AWB) and internal color balance adjustment
feature to be used for normal daylight photos. When used with the 300D, the custom white
balance (CWB) must be used for daylight photos.
VLC - This is a daylight-balanced filter which matches the Canon original filter and thus
allows all internal automatic color balancing functions to work properly.
VLC - Conventionally mounted VLC filters (as described above) for mounting in front of
camera lenses, available in 58mm, 67mm, and 77mm diameters.

Hutech Enhanced Canon Digital SLR Camera Prices:

EOS034 Canon Rebel XTi (400DH) spectrum enhanced camera with built-in astronomical
filter (Type Ib) and std Canon accessories - £789.00 + £10.00 Shipping & Insurance.

EOS035 Canon XTi (400DH) spectrum enhanced camera with built-in clear filter wideband
multi-coated and std Canon accessories - £789.00 + £10.00 Shipping & Insurance.

EOS036 Canon Rebel XSi (450DH) spectrum enhanced camera with built-in astronomical
UV/IR blocking filter (Type Ib) and std Canon accessories - £1025.00 + £10.00 Shipping &
insurance.

EOS037 Canon Rebel XSi (450DH) spectrum enhanced camera with built-in clear filter
wideband-multicoated and std Canon accessories - £1025.00 + £10.00 Shipping & insurance.

EOS038 Canon Rebel XSi (450DH) spectrum enhanced camera with built-in infrared filter
(IR720) and std Canon accessories - £1025.00 + £10.00 Shipping & insurance.

EOS044 Canon Rebel XTi (40DH) spectrum enhanced camera with built-in astronomical
filter (Type Ib) and std Canon accessories - £1249.00 + £10.00 Shipping & Insurance.

EOS045 Canon XTi (40DH) spectrum enhanced camera with built-in clear filter wideband
multi-coated and std Canon accessories - £1249.00 + £10.00 Shipping & Insurance.

EOS201 - TCD80N3 Timer Controller for modified Rebel- £169.00

EOS203 - DC12V adapter for 5D/40D/30D/20D/10D/D60/D30/digital Rebel (300D) - £89.00

EOS205 - AC and DC12V adapter kit for Rebel XT (350D) and XTi (400D) - £119.00

EOS202- Knife-Edge Focuser (Works with all Canon SLR Cameras) - £225.00

Front Filters for Hutech\Canon Cameras:
HEUIB-FF - £249.00
UIBAR-FF - £249.00
LPS-P2-FF - £249.00
LPS-V3-FF - £249.00
HA-FF - £349.00
VLC-FF - £189.00
VLC-58 Daylight Filter 58mm - £169.00
VLC-67 Daylight Filter 67mm - £175.00
VLC-77 Daylight Filter 77mm - £199.00

See the Review of the Canon 40DH in the June 2008 Issue of Sky at Night Magazine.

The Astronomy Shop

1 Tone Hill. Wellington

Somerset TA21 0AU

United Kingdom

Telephone: +44 (0)1823 665510