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Antlia Adjustable Aperture Diaphragm for 5Å CaK
The Antlia Adjustable Aperture Diaphragm is a 1.25" accessory for the Antlia Solar Discover 5Å CaK assembly that helps filter out stray light, enhancing image contrast. Its aperture adjusts from 2.0mm to 25mm in real time, and its optical height is 34mm.
Fine-Tune Contrast with a 2.0-25mm Adjustable Aperture
In solar imaging, stray light lowers the contrast of fine chromospheric detail. When used with the Solar Discover 5Å CaK assembly, this 1.25" variable aperture diaphragm helps filter out stray light, enhancing image contrast.
Antlia states that optimal contrast is reached at approximately half open (D12). The aperture can be adjusted in real time, so it can also be fine-tuned as needed for a specific condition.
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Dedicated Accessory: Offered by Antlia as an optional accessory for the Solar Discover 5Å CaK assembly.
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Adjustment Range (2.0 - 25mm): Adjustable in real time, with optimal contrast at approximately half open (D12).
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1.25" Adapter: The diaphragm uses a 1.25" adapter and has an optical height of 34mm.
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What is the primary purpose of the Antlia Adjustable Aperture Diaphragm?
The primary purpose of the Antlia Adjustable Aperture Diaphragm is to enhance image contrast during solar imaging with the Antlia Solar Discover 5Å CaK assembly. It helps filter out stray light, which enhances image contrast. Antlia states that optimal contrast is reached at approximately half open (D12).
How does the Antlia Adjustable Aperture Diaphragm improve CaK solar imaging?
Imaging in Calcium-K (CaK) light reveals features in the Sun's chromosphere, and stray light lowers their contrast. Used with the Solar Discover 5Å CaK assembly, the diaphragm helps filter out stray light, enhancing image contrast. It can be adjusted in real time to suit the conditions.
Is the Antlia Adjustable Aperture Diaphragm compatible with other solar filters or telescopes?
Antlia offers this diaphragm as an optional accessory for the Antlia Solar Discover 5Å CaK assembly. Antlia does not state compatibility with other solar filters or telescopes.
What does the "D12" optimal contrast setting mean for the Antlia Adjustable Aperture Diaphragm?
The "D12" notation refers to setting the diaphragm's aperture to approximately 12mm in diameter, which is about half its maximum opening of 25mm. Antlia states that optimal contrast is reached at approximately half open (D12), and that the diaphragm can be fine-tuned in real time as needed for a specific condition.
How do I set the Antlia Adjustable Aperture Diaphragm during a CaK imaging session?
Antlia states that optimal contrast is reached at approximately half open (D12). Start there while watching the camera image, then fine-tune the aperture in real time as needed for the conditions.
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| Product Type |
Adjustable (Variable) Aperture Diaphragm |
| Compatibility |
Antlia Solar Discover 5Å CaK assembly |
| Adapter Size |
1.25" |
| Adjustable Aperture Range |
2.0mm - 25mm |
| Optimal Contrast Setting |
Approximately half open (D12), adjustable in real time |
| Optical Height |
34mm |
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