View Full Version here: : Furious and Pi#@ed Off
rainwatcher
04-01-2012, 05:30 PM
Having got fed up with not being able to focus my SCT, what’s new !!, for photography i realised, with the help from people on this site, that the solution or a large part of it lay with a Crayford 10:1 focuser. Yep looked good, bought one today $119 from Bintel. I bought it on the foolish, damned stupid, iditic, asinine, assumption that i had every camera adapter know to man, and some known only to Spock. Thrilled with my purchase I dashed home keen to try it out, mounted it on the scope and searched for an adapter – oops. Oh well a quick look on the web will sort it out. I found a couple of prime/epp units between $89 and $135 :jawdrop:. So I can buy a hefty and fairly complicated piece of engineering for $119 and yet an adapter with three threads and three grubscrew is going to cost me the same again. Now I am a tight fisted old scrooge as some of you know, but this is beyond the pale.:mad2:
I know its less than $100 dollars, not a lot especially when compared with the overall cost of equipment, but right now I almost feel like selling the whole bloody kit and caboodle.:(
Poita
04-01-2012, 05:42 PM
What adapter do you need?
Marke
04-01-2012, 05:45 PM
I am thinking the same - adapter for what ?
You put the crayford on , the diagonal in , your eye peice . Focus with the original focuser with crayford racked out half way
then dont touch the original again - use new focuser as needed there are no adapters.
rainwatcher
04-01-2012, 05:51 PM
It has to go into the 1.25 compression barrell of ther Crayford so i think its the one below.
Marke
04-01-2012, 06:06 PM
What is it ?
rainwatcher
04-01-2012, 06:20 PM
A dual purpose camera adaptor for prime and eyepiece projection to fit in the 1.25 eyepiece hole in the Crayford
Marke
04-01-2012, 06:28 PM
Ok so what is the problem or is it you dont have this piece ?
[1ponders]
04-01-2012, 06:37 PM
Peter I have one of those and an SCT. I never use it, even though it works a treat. Use a barlow instead, you will never be able to use the magnification it produces. Infact the only part of it I use regularly is the barrel and the male T thread.
If however you want want place an Advert, I'm sure someone here will have one real cheap.
Sorry you can't have mine as i using the 1.25" /T thread :P
Karls48
04-01-2012, 07:04 PM
Have look on Andrews webside - similar thingy for $29. I'm using it as extension tube. It got M/F T thread and 1.25" nosepiece and set screw for eyepiece projection. Although I never used it with eyepices
rainwatcher
04-01-2012, 07:07 PM
Hi Marke and Paul,
interesting comment Paul are you suggesting that for eyepiece photography I go back to the old visual back straight into the T adapter and not try to use the focuser. Sort of defeats the purpose for me as I need a good quality focuser for photography and I am damned if I am to persevere with the current SCT design.
Marke, my issue is I want to have a moan about paying almost the same price for the camera adapter, a very simple piece of engineering, as the Crayford, a much more complex fabrication.
I have had that moan and feel a lot better now.:)
rainwatcher
04-01-2012, 07:15 PM
Thanks Carl and Paul, does it look anything like the lower half of the object in my photo below. ?.
If so, it look like what i need and less than $30. Good:thanx:
jenchris
04-01-2012, 07:20 PM
photo below?
Oh the photo above.
I have one of those - I've never used it - just used the t thread and nosepice and I could have used a cheap barlow and taken off the barlow lens - silly me
rainwatcher
04-01-2012, 07:27 PM
Sorry Carl i meant Karl. Too quick to print, i could get a job with the Herald Sun with this type of sub editing.:)
rainwatcher
04-01-2012, 07:29 PM
Thanks everyone, the Andrews one looks the goods.
hotspur
04-01-2012, 07:57 PM
Struth,Peter,sorry to hear of your woes'-bogan's behind the observatory,and issues in your observatory.Hope the focus issues come good.Cannot really offer any helpful advice-always stayed away from SCT and used refractors.May be sell the whole tube set up you have get a good WO 110 or similar.Or rent a D10 for the day;)
[1ponders]
04-01-2012, 07:59 PM
Out of curiosity Peter, are you doing Deepsky or planetary?
Karls48
04-01-2012, 08:07 PM
No worries Peter. I tried to post pic of that adaptor but it does not work. If you want to see it go to http://www.gsotelescope.com.tw/admin/disk/Adapter/CA.jpg
As I said before, I do not know if it works OK as eyepiece projection adaptor - I use it as extension tube and as bonus I get 1.25" nosepiece that by itself cost more (from some suppliers) then whole adaptor.
Before I retired I worked as Production Manager in Electronic manufacturing.
I totally agree with your assessment about the cost of accessories. The profit margin on some items goes to thousands of %. I'm talking about cost of electronic accessories in general.
trek1701
04-01-2012, 08:22 PM
“I don't believe it" ;)
rainwatcher
04-01-2012, 09:29 PM
Hi Paul,
deep sky mainly. I do some planetary but on my other scope a 8'' Newtonian.
Very funny Mark :lol:
[1ponders]
04-01-2012, 10:00 PM
I'm trying to work out why you actually need it. You have a 10:1 crayford on the back of an SCT? Then a straight forward Prime Focus adapter should be all you need (I'm assuming you are trying to attach a camera that has a T thread at the front, DSLR T Adapter or CCD thread). I'm not sure how the adapter your looking for will actually help you. Yes it has the potential to give you ridiculously long effective focal lengths but with the trade off of in credibly slow f ratios. I dont see how that is going to help you image deepsky objects with an sct that is already at f/10.
Or am I missing something here?
rainwatcher
05-01-2012, 01:07 AM
There is no thread on the crayford focuser to take any of my T ring fittings, it only has the sleeved 1.25 eyepiece hole with the internal locking collet. All of my other adapters are threaded adapters, or in the case of the celestron eyepiece projection mounting it actually fits over the top of the visual back and is held on with 2 screws. I am not trying to extend my focal plane back any further I just need a way of fixing the camera to the 1.25 adapter in the Crayford. Which is why i need something with a 1.25 barrell on one end and a thread on the other that goes into the camera T ring. The CA001 from Andrews or Bintel is just that fitting and is just the trick. $29.
rainwatcher
05-01-2012, 01:09 AM
Oh and by the way Paul i am on the lookout for a .63 or .5 FR to speed up the optics.
marki
05-01-2012, 02:09 AM
What type of camera are you using? By the talk of T threads I am assuming it is a DSLR????. If so why not get one of T hread to 2" adaptors,that way you will not bet creating a bottleneck in the imaging train.
Mark
rainwatcher
05-01-2012, 02:29 AM
Yep, a canon 1000D. Good idea, but i will still be restricted when i use my 1.25 for eyepiece projection. Thanks, i will look into that.
[1ponders]
05-01-2012, 08:29 AM
you only have a 1.25" bore in your crayford? It doesn't have a 1.25" - 2" sleeve in it does it? If it does then all you need is one of these http://www.bintel.com.au/Astrophotography/Adapters/Bintel-2--1-25--adapter-with-T-Thread/690/productview.aspx
rainwatcher
05-01-2012, 09:38 AM
Yes i misstyped as that idiot H Clinton would say. It is a 2'' bore. Yes i have to get the adapter.
rainwatcher
05-01-2012, 09:40 AM
Problem solved ! i was too busy being excited to remember the adapter.:lol:
Poita
05-01-2012, 09:49 AM
I'm still a little baffled, how were you attaching your camera to the telescope with the original focuser? Were you using a tele-extender?
All you should need is a simple T-Ring setup like this:
http://www.astro.shoregalaxy.com/DSLR%20Tutorial/t-attachments2a.jpg
Is the camera the Canon 1000D?
*EDIT* missed the 2nd page of the thread! Glad to see it is working for you now.
[1ponders]
05-01-2012, 11:05 AM
:D glad to hear you've got it worked out Peter:D
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