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Photos by Del Johnson of San Diego,
CA. |
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Helix Nebula
The Helix Nebula. One hour exposure on Kodak Multispeed Ektapress
at prime focus of 12.5" f/5 with coma corrector and ST-4 autoguider. |
Omega Nebula
Omega Nebula taken with a 12.5" f5 Dobsonian on a Dual-axis Equatorial
Platform using Kodak Ekt press PJM film. This 10 minute exposure was
taken using a Lumicon Coma Corrector. |
Leo Triplet
M65, M66 and NGC 3628 in Leo. Prime focus of 12.5" f/5 reflector using
the Lumicon Coma Corrector. Summation of three separate one hour exposures
on Kodak 35mm Multispeed Ektapress print film, autoguided with ST-4
CCD. Negatives scanned and digitally stacked by Astro Photo. |
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Orion Nebula
45 minute exposure with Fuji ISO 100 Superia print film 12.5" f/5
prime focus with Lumicon coma corrector and ST-4 autoguider, off-axis
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Lagoon Nebula
Here is a 15-minute exposure of the Lagoon Nebula on Kodak PJM Ektapress
film, using a 12.5" f/5 reflector and a Lumicon coma corrector. Manually
guided. |
Trifid Nebula
This fine photo of the Trifid Nebula is a combination of three ten-minute
exposures that were digitized and combined to produce the final image.
Photos taken by Del Johnson using a 12.5" Dobsonian on a dual-axis
Equatorial Platform. Film used was Kodak Ektapress Multispeed. |
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Crescent Nebula
50 minute exposure at prime focus of a 12.5" f/5 reflector with a
Lumicon coma corrector, Kodak PJM Ektapress Multispeed film. Guided
with an ST-4. |
Veil Nebula
Western Section
50 minute exposure at prime focus of a 12.5" f/5 reflector with a
Lumicon coma corrector, Kodak PJM Ektapress Multispeed film. Guided
with an ST-4. |
Veil Nebula
Eastern Section
50 minute exposure at prime focus of a 12.5" f/5 reflector with a
Lumicon coma corrector, Kodak PJM Ektapress Multispeed film. Guided
with an ST-4. |
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The Horsehead
Nebula
60 minute exposure at prime focus of a 12.5" f/5 reflector with a
Lumicon coma corrector, Kodak PJM Ektapress Multispeed film. Guided
with an ST-4. |
NGC 7331 &
Stephens Quintet
60 minute exposure at prime focus of a 12.5" f/5 reflector with a
Lumicon coma corrector, Kodak PJM Ektapress Multispeed film. Guided
with an ST-4. |
Virgo Cluster
M84, M86 and other galaxies in the Virgo Cluster. Prime focus of 12.5"
f/5 reflector using the Lumicon Coma Corrector. One hour exposure
on Kodak 35mm Multispeed Ektapress print film, autoguided with ST-4
CCD. Negative scanned by Astro Photo. |
| Here
is an article that Del Johnson wrote on using an ST-4 to autoguide
with his Equatorial Platform. |
