Sky's the Limit 2" IR filter / infra red blocking filter - CCD cams -16
We are delighted to offer for sale this 2 inch infra red blocking filter.
Some people believe that this is the essential piece of equipment for astro
imaging with CCDs, CMOS, webcams or digital cameras.
With our eyes we only see the visible spectrum of light. However, your
imager can also see infra red. This can lead to images that are blurred
by infra red unless you use a suitable means of stopping the infra red from
reaching your imager.
The filter cuts out the IR (and uv) wavebands but allows visible red to pass
resulting in sharper images.
At Sky's the Limit we measure the performance of our filters so that you can
see what you are getting. No 'between this and that' specifications -
what you see it what you get. Here is the transmission graph for this
filter:
| Nebula's light (nm) | Transmission T% |
| H-β 478nm | 96.90% |
| H-β 479nm | 97.01% |
| H-β 480nm | 97.34% |
| H-β 486.1nm | 96.67% |
| O-Ⅲ 495.9nm | 97.42% |
| O-Ⅲ 500.7nm | 96.99% |
| H-α 656.3nm | 97.73% |
| SII - 672.4nm | 94.67% |
| Artificial light (nm) | Transmission T% |
| Hg 435.8nm | 89.81% |
| Hg 546.1nm | 97.81% |
| Hg 577.0nm | 97.19% |
| Hg 578.0nm | 96.94% |
| NA 589.6nm | 97.18% |
| Na 615.4nm | 98.06% |
| Na 616.1nm | 97.96% |
| Max Tx%= | 98.17 |
| @ nm= | 614.82 |
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Genuine UK Stock
Why buy from us?
Have a look at our feedback and you will see the common theme is that we communicate well. Before a sale, during the processing of the transaction and after you have purchased an item you have access to a telephone number and email address both connected to a human being who knows what you have been sold. We will do our utmost to make things as smooth as possible for you - especially if you are new to astronomy or to Ebay, we all had to start at some time. There is no such thing as a silly question, please ask knowing that we will treat you courteously and respectfully as we hope you will want to come back to us if you choose to upgrade or buy some extras for your hobby.
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Skies Unlimited is the Ebay trading name of "Sky's the Limit". Feel free to email any questions through Ebay.