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Description
All filters are not the same.
These Wratten filters were made for Starguider by Optolong.
Only Sky's the Limit:
- Test every filter sold
- Include an individual data graph for each filter
- Inform you of all the transmission and cut off frequencies before you buy
- Can provide a complete test result for your filter on request
Genuine UK Business
Genuine UK Stock
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.
This is the typical description of the 80A filter:
"The #82A Light Blue enhances areas of low contrast while avoiding reduction of the overall brightness at the same time. It thus rivals the #80A Blue in popularity, being useful on the Moon, Mars, Jupiter, and Saturn. On the Moon it brings out surface detail; on Mars it is very useful during the violet clearing for studying the polar caps and the surface, while on Jupiter and Saturn it emphasizes the transitions between the various belts. Its use on Mercury and Venus gives results similar to #80A.
It has even been reported useful for bright galaxies, particularly face-on spirals such as the M51. The galactic structure, such as detail in the spiral arms, is more pronounced with the filter. Also, try this one to split binaries. It also enables viewing of cometary gas tails. The light blue filter is also a useful filter to stack along with other filters."
It is also usually quoted as being 73% transmission - just look at ours at 90%.
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.
Payment
Please 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 Sale
All goods, unless otherwise stated, are brand new and in first class condition.
Compliments may be made at any time.
About Us
Sky's the Limit have been trading on Ebay since 2004.
Our aim has always been to:
- Provide quality goods at the best price possible
- To treat our customers as we would only dream of being treated ourselves
We 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 Us
Please feel free to contact us through Ebay messages.
