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crayford hell


todd8137

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well were do a start,i decided to by a low profile crayford to better the scope and help with my pics adventure,well just put in a normal 1.25 ep in is a hassle and takes a good 5 mins to get focus because not only ,do you have to pull the ext tube all the way out,but also the 1.25:holderthat the ep sits in what a hassle the 12"dob was so easy to set up with the rack and pinion focuser.i had a long 2" skywatcher t adapter which was just to long when use in the cannon camera and ended up by in the short 2"one from flo.that was fun and games in its self but got that sorted all was fine the camera gets great focus.

so my next headache started with the cape instrument uw80 f30mm ep , i thought this would make a great first 2"ep and after a bit of "duff advice decided to buy it for near on 55 quid, only to find out this time it can not get far enough away from the crayford even with the tube fully out, it would get focus if a held it just above the focuser so what to do ,do a by a ext ring just for one ep or by a star diagonal and use it in the 90mm meade frac ?. when a did end up getting focus it was usless the stars in the middle were fine,but round the edges rubbish the pain in side was welling up so a called it a night.a see flo do BaaderT2ext.jpg Baader T2 Extension Tube

am not sure if these would screw on to the bottom of the 2 inch ep, to give me a bit more lenght am sure some one will put me straight ,as these ext tubes come in all lenghts but i do not think these are what they are for . (add in lenght to my 2" ep) so my troubles will end with this some day any ideas why the 2:cape will not get focus a no it needs to be longer at the bottom so it van,get further away from the low profile crayford .

update 5th April

hi got a 80mm exttnsion tube delivered and theres no prob at all nowthe 2"eps get perfect focus the web cam is 100 times better the cameras are fine a was gona get the 50mm one glad a did not now after get in the tape measure out and some card just to see how much travel was needed it was 53mm phew,every thing works fine now and i take back all what a said about the crayford but think befor ya buy this may be a prob for you to .........

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Hi Pat, I had this problem too so I bought a 50mm extension tube - I made up a cardboard tube about 4" long and kept trimming it until I found a length that gave me focus about halfway along the focuser tube - this has worked ok for all my eps. but I guess it could be that you may need several tubes of different lengths. I still have a problem if I use my 2" Barlow with some eps. Life aint simple is it mate :confused:

Cheers Paul :)

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Hi Pual lol what a pain a was all excited last night to use the new 2" ep and what a downer it was to see it did not work out the way it should the crayffords should come with a "stress warning" on the packet, not to be put of a will try what you say with the cardboard could ya post me a link for the extension tube you have ,so a have some idea what am looking for a think these from flow are mainly for camera work not to sure what a pain

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Sorry to see someone else suffering what I suffered

I went the crayford route about 10 years ago. ... oh the pain and anguish.

In the end I popped round the model shop we had a work and for the price of a beer I had a 2" to 1.25" adapter/extension with slip ring made up.

Now I have my 25mm 1.25" plossel parfocal with my camera

Not having such a brilliant facility available at work any more I'd probably buy some 2" extension tubes and a 1.25 to 2" adapter if the craford didn't come with one. Point is it would never produce a system parfocal with your camera... hmm maybe I should get my adapter I have made up in a larger batch.

Derek

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hi Derek glad its not just me ,the cameras are fine its the 2"ep even with the crayford pulled all the way out its a paini shpould imagine if it was 3cm longer it would be fine a will phone FLO in the morning and se what goodies they have to fix this , its on.y the 2"eps that are a prob the crayford came with both 2" and 1.25" adapters the pics a have are ok more down to me but had some god results but the dob is not that good its on a dob mount so no tracking but 3/4 secs staked works some of the time a will include a pic of my prob at some point over the weekend

cheers pat

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