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1.25 Sky’s the Limit HT Wratten filter No 23A Light Red – 9 1.25 Sky’s the Limit HT Wratten filter No 23A Light Red 4545-9
1.25 Sky’s the Limit HT Wratten filter No 23A Light Red 4545-9Click images to enlargeDescriptionAll filters are not the same.
These Wratten filters were made for us by Optolong.
Only Sky’s the Limit:Test every filter soldInclude an individual data graph for each filter (sent by email)Inform you of all the transmission and cut off frequencies before you buyCan provide a complete test result for your filter on requestLet you name the price you are prepared to pay starting at cost
By individually testing each filter and issuing a certificate of performance these Wratten filters have a performance guarantee that no other seller offers. Below is the actual certificate of the filter listed which makes explicit both the bandpass wavelengths of the filter as well as the percentage of transmission at any point through the visible electromagnetic spectrum. Each filter case and box carries the unique identifier to enable us to match our testing to the filter – these are added here in the UK and hence match the filter in the package.
Our Wratten filters have a clear aperture of 26mm which gives an area of 530mm2 which is over 11 percent more than that of a 24.5mm diameter clear aperture filter which has an area of 471mm2.
Our Wratten filters have a depth of 5mm.
At Sky’s the Limit we measure the performance of each 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. The graph below is of the actual filter you will receive.
This is the typical description of the 23A filter: “The Light Red Filter is another great filter for use on Mars, Jupiter, and Saturn, but because of lowered light transmission, it may not perform well for 6″; and smaller telescopes. It carries out many of the same functions as the #21 and the #15, but with more contrast, bringing out marginally defined blue-green surface detail.The filter is ideal for viewing the polar ice caps and surface features of Mars. It brings out yellow dust clouds and darkens Maria, oases and canal markings. On Jupiter and Saturn, this filter is useful for studying blue clouds.The filter also increases contrast between Mercury and the bright blue sky during daylight observations or during twilight, when the planet is near the horizon. On Venus, it occasionally reveals deformations of the terminator. For comets the filter improves definition of the dust tail.”
It is also usually quoted as being 25% transmission – just look at ours which is nearer 90% maximum transmission. Genuine UK stock.
We can guarantee our filters – can you?
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 sometime. 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.
We will not leave you in the dark!
Skies Unlimited is the EBay trading name of “Sky’s the Limit”. Feel free to email any questions through EBay.PaymentPlease pay as soon as possible after the auction and we will get the items to you with minimum of delay. We usually get goods on the way within 24 hours (weekends excepted).Paypal is the quickest way to pay. We accept Postal Orders, Bank drafts and Building Society cheques and deal with them like cash so your goods are dispatched as soon as we have the payment.Please do not send cash through the post.Terms of SaleAll goods, unless otherwise stated, are brand new and in first class condition.Compliments may be made at any time.About UsSky’s the Limit have been trading on Ebay since 2004.
Our aim has always been to:Provide quality goods at the best price possibleTo treat our customers as we would only dream of being treated ourselvesWe work hard to maintain a 100% satisfaction rating and in order to achieve this, should anything not be quite as you expected it to be, all we ask is that you give us a chance to put it right. If something is faulty, we will put it right at our expense with all shipping costs refunded in full. You will not be out of pocket.If you change your mind or ordered the wrong thing you can return it within 30 days preferably with all packaging, inner and outer, for a refund. The cost of all shipping will be your responsibility.These are in addition to your statutory rights.Contact UsPlease feel free to contact us through Ebay messages.Pictures sell!
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Category: Cameras and Photography:Telescopes and Binoculars:Telescope Parts and Accessories:Filters
Location: Welwyn Garden City