Celestron CPC DELUXE 1100 HD, Instruction Manual, Page: 28 / 75

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5. Mount your camera body onto the T-Ring the same as you would any
other lens.
͞Ǥ ‡––Š‡•Š—––‡”•’‡‡†–‘–Š‡Dzdz•‡––‹‰Ǥ
͟Ǥ ‘ —•–Š‡–‡Ž‡• ‘’‡‘ƒ•–ƒ”Ǥ
͠Ǥ ‡–‡”›‘—”•—„Œ‡ –‹–Š‡Ƥ‡Ž†‘ˆ›‘—” ƒ‡”ƒǤ
͡Ǥ ‹†ƒ•—‹–ƒ„Ž‡‰—‹†‡•–ƒ”‹–Š‡–‡Ž‡• ‘’‡Ƥ‡Ž†ǤŠ‹• ƒ„‡–Š‡‘•–
time consuming process.
͙͘Ǥ’‡–Š‡•Š—––‡”—•‹‰ƒ ƒ„Ž‡”‡Ž‡ƒ•‡Ǥ
11. Monitor your guide star for the duration of the exposure using the
buttons on the hand controller to make the needed corrections.
12. Close the camera’s shutter.
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ĊėĎĔĉĎĈėėĔėĔėėĊĈęĎĔēȋȌ
PEC for short, is a system that improves the tracking accuracy of the
drive by reducing the number of user corrections needed to keep a guide
star centered in the eyepiece. PEC is designed to improve photographic
quality by reducing the amplitude of the worm errors. Using the PEC
ˆ— –‹‘‹•ƒ–Š”‡‡Ǧ•–‡’’”‘ ‡••Ǥ ‹”•–ǡ–Š‡‡‡†•–‘‘™–Š‡ —””‡–
position of its worm gear so that it has a reference when playing back
the recorded error. Next, you must guide for at least 8 minutes during
™Š‹ Š–‹‡–Š‡•›•–‡”‡ ‘”†•–Š‡ ‘””‡ –‹‘›‘—ƒ‡Ǥȋ––ƒ‡•–Š‡
worm gear 8 minutes to make one complete revolution, hence the need
to guide for 8 minutes). This “teaches” the PEC chip the characteristics
of the worm. The periodic error of the worm gear drive will be stored in
the PEC chip and used to correct periodic error. The last step is to play
„ƒ –Š‡ ‘””‡ –‹‘•›‘—ƒ†‡†—”‹‰–Š‡”‡ ‘”†‹‰’Šƒ•‡Ǥ‡‡’‹‹†ǡ
this feature is for advanced astrophotography and still requires careful
guiding since all telescope drives have some periodic error.
Using Periodic Error Correction
 ‡–Š‡–‡Ž‡• ‘’‡Šƒ•„‡‡’‘Žƒ”ƒŽ‹‰‡†—•‹‰–Š‡‘”–ŠŽ‹‰ȋ‘”
EQ South for southern hemisphere) method, select PEC from the Utilities
menu and press ENTER to begin recording your periodic error. Here’s
how to use the PEC function.
͙Ǥ ‹†ƒ„”‹‰Š–•–ƒ””‡Žƒ–‹˜‡Ž› Ž‘•‡–‘–Š‡‘„Œ‡ –›‘—™ƒ–
to photograph.
͚Ǥ •‡”–ƒŠ‹‰Š’‘™‡”‡›‡’‹‡ ‡™‹–Š‹ŽŽ—‹ƒ–‡† ”‘••Šƒ‹”•‹–‘›‘—”
–‡Ž‡• ‘’‡Ǥ”‹‡––Š‡‰—‹†‹‰‡›‡’‹‡ ‡ ”‘••Šƒ‹”••‘–Šƒ–‘‡‹•
parallel to the declination while the other is parallel to the R.A. axis.
3. Center the guide star on the illuminated cross hairs, focus the
telescope and study the periodic movement.
4. Before actually recording the periodic error, take a few minutes to
practice guiding. Set the hand control slew rate to an appropriate
guide rate (rate 1 = .5x, rate 2 = 1x) and practice centering the guide
star in the cross hairs for several minutes. This will help you familiarize
yourself with the periodic error of the drive and the operation of
the hand control. Remember to ignore declination drift when
programming the PEC.
Note: When recording PEC, only the photo guide rates (rates
1 and 2) will be operational. This eliminates the possibility of
moving the telescope suddenly while recording.
5. To begin recording the drive’s periodic error, press the MENU button
ƒ†•‡Ž‡ –ˆ”‘–Š‡–‹Ž‹–‹‡•‡—Ǥ•‡–Š‡Ȁ• ”‘ŽŽ
buttons to display the Record option and press ENTER. You will have
͝•‡ ‘†•„‡ˆ‘”‡–Š‡•›•–‡•–ƒ”–•–‘”‡ ‘”†ǤŠ‡Ƥ”•––‹‡‡ƒ Š
observing session that PEC record or play is selected, the worm gear
—•–”‘–ƒ–‡‹‘”†‡”–‘ƒ”‹–••–ƒ”–‹‰’‘•‹–‹‘Ǥˆ–Š‡”‘–ƒ–‹‘‘ˆ
–Š‡™‘”‰‡ƒ”‘˜‡•›‘—”‰—‹†‡•–ƒ”‘—–•‹†‡–Š‡Ƥ‡Ž†‘ˆ˜‹‡™‘ˆ–Š‡
eyepiece, it will have to be re-centered before the recording begins.
 ‡–Š‡™‘”‰‡ƒ”‹•‹†‡š‡†ǡ‹–™‹ŽŽ‘–‡‡†–‘„‡’‘•‹–‹‘‡†ƒ‰ƒ‹
—–‹Ž–Š‡–‡Ž‡• ‘’‡‹•–—”‡†Ǧ‘ơǤ‘ǡ–‘‰‹˜‡›‘—”•‡Žˆ‘”‡–‹‡–‘
prepare for guiding, it is best to restart PEC recording after the worm
gear has found its index.
͞Ǥ ˆ–‡”͠‹—–‡•ǡ™‹ŽŽƒ—–‘ƒ–‹ ƒŽŽ›•–‘’”‡ ‘”†‹‰Ǥ
͟Ǥ ‘‹––Š‡–‡Ž‡• ‘’‡ƒ––Š‡‘„Œ‡ –›‘—™ƒ––‘’Š‘–‘‰”ƒ’Šƒ† ‡–‡”
the guide star on the illuminated cross hairs and you are ready to play
back the periodic error correction.
͠Ǥ  ‡–Š‡†”‹˜‡ǯ•’‡”‹‘†‹ ‡””‘”Šƒ•„‡‡”‡ ‘”†‡†ǡ—•‡–Š‡Žƒ›„ƒ 
function to begin playing back the correction for future photographic
‰—‹†‹‰Ǥˆ›‘—™ƒ––‘”‡Ǧ”‡ ‘”†–Š‡’‡”‹‘†‹ ‡””‘”ǡ•‡Ž‡ –‡ ‘”†
and repeat the recording processes again. The previously recorded
information will be replaced with the current information. Repeat
•–‡’•͟ƒ†͠–‘’Žƒ›„ƒ –Š‡ ‘””‡ –‹‘•ˆ‘”›‘—”‡š–‘„Œ‡ –Ǥ
Does the PEC function make unguided astrophotography possible? Yes and
‘Ǥ ‘”•‘Žƒ”ȋƤŽ–‡”‡†ȌǡŽ—ƒ”ƒ†’‹‰‰›„ƒ ȋ—’–‘͚͘͘Ȍǡ–Š‡ƒ•™‡”‹•
›‡•Ǥ‘™‡˜‡”ǡ‡˜‡™‹–Šǡ‘ơǦƒš‹•‰—‹†‹‰‹••–‹ŽŽƒ†ƒ–‘”›ˆ‘”Ž‘‰
exposure, deep sky astrophotography. The optional Reducer/Corrector lens
reduces exposure times making the task of guiding a little easier.
Š‡‰‡––‹‰•–ƒ”–‡†ǡ—•‡ˆƒ•–ƤŽ•–‘”‡ ‘”†ƒ•— Š†‡–ƒ‹Ž‹–Š‡
shortest possible time. Here are proven recommendations:
Ȉ –ƒ”͙͘͘͘ȋ ‘Ž‘”’”‹–Ȍ
Ȉ ‘‹ ƒ͚͛͘͘ȋ ‘Ž‘”’”‹–Ȍ
Ȉ —Œ‹ Š”‘‡͙͘͘͞ȋ ‘Ž‘”•Ž‹†‡Ȍ
Ȉ ͙͛͘͘͘ȋ ‘Ž‘”•Ž‹†‡Ȍ
Ȉ ‘– Š Š”‘‡͘͘͜
Ȉ Ǧƒš͚͛͘͘ȋ„Žƒ ƒ†™Š‹–‡’”‹–Ȍ
Ȉ Ǧƒš͘͘͜ȋ„Žƒ ƒ†™Š‹–‡’”‹–Ȍ
•›‘—’‡”ˆ‡ –›‘—”–‡ Š‹“—‡ǡ–”›•’‡ ‹ƒŽ‹œ‡†ƤŽ•ǡ™Š‹ Šƒ”‡ƤŽ•–Šƒ–
are designed or specially treated for celestial photography. Here are
some popular choices:
Ȉ –ƒ”͙͚͝ȋ ‘Ž‘”’”‹–Ȍ
Ȉ —Œ‹ Š”‘‡͙͘͘ȋ ‘Ž‘”•Ž‹†‡Ȍ
Ȉ ‡ Šƒǡ‰ƒ•Š›’‡”‡†ȋ„Žƒ ƒ†™Š‹–‡’”‹–Ȍ
Ȉ Ǧƒš͘͘͜ȋ„Žƒ ƒ†™Š‹–‡’”‹–Ȍ
There is no exposure determination table to help you get started. The
best ways to determine exposure length is to look at previously published
’Š‘–‘•–‘•‡‡™Šƒ–ƤŽȀ‡š’‘•—”‡ ‘„‹ƒ–‹‘•™‡”‡—•‡†‘”–ƒ‡
unguided sample photos of various parts of the sky while the drive is
running. Always take exposures of various lengths to determine the best
exposure time.
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ĊėėĊĘęėĎĆđčĔęĔČėĆĕčĞ
Your CPC makes an excellent telephoto lens for terrestrial (land)
photography. Terrestrial photography is best done with the telescope in
Ž–Ǧœ ‘Ƥ‰—”ƒ–‹‘ƒ†–Š‡–”ƒ ‹‰†”‹˜‡–—”‡†‘ơǤ‘–—”–Š‡–”ƒ ‹‰
†”‹˜‡‘ơǡ’”‡••–Š‡ȋ͡Ȍ„—––‘‘–Š‡Šƒ† ‘–”‘Žƒ†• ”‘ŽŽ†‘™
–‘–Š‡”ƒ ‹‰‘†‡•—„‡—Ǥ•‡–Š‡ƒ†• ”‘ŽŽ‡›•ȋ͙͘Ȍ–‘
•‡Ž‡ ––Š‡ơ‘’–‹‘ƒ†’”‡••ǤŠ‹•™‹ŽŽ–—”–Š‡–”ƒ ‹‰‘–‘”•
‘ơ•‘–Šƒ–‘„Œ‡ –•™‹ŽŽ”‡ƒ‹‹›‘—” ƒ‡”ƒǯ•Ƥ‡Ž†‘ˆ˜‹‡™Ǥ
Metering
Š‡Šƒ•ƒƤš‡†ƒ’‡”–—”‡ǡƒ†ƒ•ƒ”‡•—Ž–ǡƤš‡†ˆȀ”ƒ–‹‘•Ǥ‘’”‘’‡”Ž›
‡š’‘•‡›‘—”•—„Œ‡ –•’Š‘–‘‰”ƒ’Š‹ ƒŽŽ›ǡ›‘—‡‡†–‘•‡–›‘—”•Š—––‡”
•’‡‡†ƒ ‘”†‹‰Ž›Ǥ‘•–͛͝ ƒ‡”ƒ•‘ơ‡”–Š”‘—‰ŠǦ–Š‡ǦŽ‡•