K-Tec

Recommended kit to fit Nikon D7000 on to Meade LXD75 6in

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11 years 10 months ago #96565 by jjrock
Marto,

I'm in Inishowen, North Donegal, that's a very kind offer, but likely to cost more in diesel to get to you than it would be to buy the 2in adapter :-( If thats what I need I'l have to get it anyways

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11 years 10 months ago #96567 by TrevorDurity
Yep, much better off with a 2 incher or you'll get a load of vignetting with that big dslr chip otherwise.

Do you know how much inward focus you need? As far as I know the lxd newtonians are f5 which would mean that you'll probably get coma (distorted stars) away from the centre of the image when used on the newt so it may be good to get an mpcc anyway. I used to have the same problem on my f5 8 incher back in the day. Dug through some old mails and found some advice from Patrick in Telescope Service:

There's basically two ways to go. First of all you need a coma corrector. Aside from offering MUCH better image sharpness photographically the corrector also puts the focus point about 10mm further out. Also you can often put the focal plain further out by "aligning" the mirror further up. That is to say, you turn all three collimation-screws counterclockwise, thus moving the mirror further up. Just be careful that you don't go too far, otherwise the mirror cell might get loose.

It was a GSO Newtonian but I'm sure it would be similar with the Meade.

Might be worth dropping them a line.

Hope that helps.

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11 years 10 months ago #96739 by jjrock
Hello Folks, it's been a while since clear skies and have been waiting to try out a prime shot of the moon, latest effort I've tightened the culmination screws to their max when culminating the scope, the eyepiece holder can be broke down in 2 pieces so removed 1, the below picture was taken tonight at the maximum down focus that could be achieved, it was taken with the d3000 as my 7000 is getting it's sensor cleaned, 1/1000th ISO800, have a funny feeling that it's still a minute fraction out of focus, your opinion would be helpful, thanks in advance
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11 years 10 months ago #96742 by Marto
hard to say, can you attach a larger image somehow? If you pushed me I'd say it's still a little soft. Did you get the 2" adaptor?
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11 years 10 months ago #96743 by jjrock
Marto, didn't get the 2" yet this was the 1.25", would the 2" allow any more on the focus issue? The above image is over 4MB but comes up small here, you may have to right click on the image and try and open it in a new window or save file and open it in PS or something similar.

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11 years 10 months ago - 11 years 10 months ago #96747 by jjrock
Just tried the Barlow lens and it worked great with plenty room on both sides of Focus, here is an image with the Barlow. If the 2" could afford be more focus room without the Barlow I'd go for that

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