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chrisrnuttall

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Posts posted by chrisrnuttall

  1. I learned a bit of a lesson on this subject the other night which i shall share....

    i always view planets with the highest magnification the night will stand, if its a choice of two different eyepieces which are straddling the limit for the night i always go for the higher magnification one, over the years i have got the best results this way and i am very happy with it.

    But the last time i was out i spent 2 hours observing mars and saturn at what i thought was 370x (my scope is 200mm diameter so this is close to the theoretical limit but not over it, and the seeing was excellent), picked out loads of detail, and was thinking about calling it a night when realised i had the wrong eyepiece in the focusser! i had been observing at 270x not 370x. I changed eyepieces over to give 370X and although the image was bigger and did not degrade noticably (infact it still looked sharp ) i didn't really pick out much more detail, it was just bigger.

    I was pretty suprised by this, but the thing is that at the lower magnification the details were slightly sharper with slighly better contrast, which made them visible.

    But then at the higher mag the details were bigger, so really there wasn't much to choose between high and medium magnification. You couldn't see the datails any better either way, it was just different!

    In future i think i will play with the magnification a bit more to see if it helps with seeing the details, and not just go for the higher end automatically.

    so i suppose my advice would be buy an eyepiece, try it for a few nights and if you don't think it is an improvement sell it on, then at least you know one way or the other.

    A televue plossl or edmund RKE are quite inexpensive and very high quality for the moneys on planets.

  2. okay here are my results so far

    Opt corp $14 shipping and i can only find 1.25" dust caps

    Agena minimum order of $30 plus shipping, but they do sell all the sizes.

    teleskop service - only do 1.25" size

    hands on optics - i can't find them on the website

    so i don't have a magic answer, the only place i have found who does a good range is agena but they are too expensive.

    I will try to find them in the uk i think, it's either that or make them somehow.

    thinking hat on again!

  3. the agena ones look perfect, i am about to send them an email to ask about shipping.

    i will also email teleskop service to ask them.

    no answer from optcorp yet, mind you it's only monday lunchtime there at the moment!

    as for printing them, i could get that done through work for not much money, i use a company who does selective laser sintering from 3d cad models, and i simply hadn't thought of doing it! I might use it as a back up plan.

    I will let you all know my findings...when i find them!

  4. steve

    the AE ones are terribly posh but it looks like they only fit in the focusser on a telescope, and the SnS ones are the dipped rubber ones i am trying not to buy (call me a dust-cap-snob - actually i do need a couple of sizes besides the snobbery!)

    I did email optcorp after i wrote my reply earlier today, i read it back and thought 'that's really pessimistic, hopefully they will get back to me tomorow, and if you are right John, then i may be in luck.

    thanks for all the help guys

  5. oh well, thanks for posting. It looks like i dont have alot of choice.

    I reckon it could expensive to import from the US, I've done it before on other goods.

    Shipping must be at least a fiver and then there will be GST, VAT, import duty and a trip to the post office to pay them some charges too. I think it is all to do with stopping people from europe buying from the US now the internet is so popular - that way they can keep prices in the EU high.

    ......I can't understand why no-one sells them in the UK though.

    thanks again

  6. Does anyone know where to buy eyepiece caps?

    i need a couple to fit the 1.25" barrel end, and some slightly bigger to cover the tops too. I have already found a couple of places selling the rather cheap-looking dipped rubber things, but i want the proper injection moulded ones you get with a new eyepiece, in a variety of sizes.

    thanks in advance

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