I need a 2"-->1.25" adapter, but "sunk" into focuser?
Just thinking ahead. I couldn't get enough in-travel on my standard Bintel Crayford 2" focuser for my webcam (Logitech Quickcam Pro 4000) mounted on an adapter (photos attached - apologies out of focus). The adpater is screwed up tight - I don't think there is a way to get the adapter further into the webcam - there are two options where it is coming to a halt - the thread or the inner flange against the "screw in" tube in the webcam. The external flange sits about a mm off the webcam body.
I've more testing to do in daylight, when the rain stops and when I have time, but am thinking of options now.
One is to "butcher" the adapter by removing the flange that stops the adapter going deeper into the 2"-->1.25" adapter I use in the focuser (std with the focuser - see photo), but I'd prefer not to. The webcam focuses in the barlow and the flange obviously locates the camera in the same position relative to the barlow/focuser (within all the sloppy tolerances) each time, so I'd rather keep it.
I've searched the net and the forum for the second option which I really want, but cannot find it. To describe:- The 2"-->1.25" adapter stands the webcam some 10mm above the focuser. If I could get a lower profile adapter? But, even better, can I make up a 2"--1.25" adapter that will sit in the top of the focuser. I'm thinking of an adapter with a 1.25" hole which is a snug fit for my webcam adapter, that sits under the upper lip of the focuser (maybe with a couple of hooks up over the edge to stop the whole lot falling onto the secondary in the tube!) and at the right depth so the webcam is right up to where it almost touches the top of the focuser, yet the adapter is still held tight by the screw/brass ring at the top of the focuser. I will have gained more than a cm of in-travel.
Does such an adapter exist for sale, or has anyone made one and can share experience?
Try Scopestuff - they have a Negative Profile Eyepiece Adapter, 1.25" to 2". Cost US $39.
Cheers
Dennis
From their website: "Need more in-focus when using a 1.25" eyepiece or accessory in a 2"
focuser? Our Negative Profile Eyepiece Adapter allows the eyepiece
to be inset over 3/4" more than a low profile adapter. The inset accepts
eyepiece bodies or accessories up to 1.75" in diameter. The eyepiece
barrel is held securely in the adapter with two rounded tip setscrews.
2" barrel is 1.6" deep and has a top flange. Interior diameter is 1.75".
Overall height is 1.75". Black anodized machined aluminum, with two
stainless steel rounded tip setscrews. Weighs 4 oz. Allen wrench
included."
Try Scopestuff - they have a Negative Profile Eyepiece Adapter, 1.25" to 2". Cost US $39.
Problem is, if you order from them you will never get it.
Have you looked at some of the "usual" Aussie sites? I think I have seen something like this before. Fortunately, if I needed one I would just make one up on the lathe...some boys have bigger toys
Problem is, if you order from them you will never get it.
Have you looked at some of the "usual" Aussie sites? I think I have seen something like this before. Fortunately, if I needed one I would just make one up on the lathe...some boys have bigger toys
Are you confusing Scopestuff with Scopetronix?
I have always had excellent service and response from Jim Henson and his people at Scopestuff.
Many thanks everyone! Obviously I just couldn't search properly!
Ken, I'd be grateful if I can test your adapter on my next visit to SV. I can always withdraw the webcam and its adapter to ensure the webcam ball clears.
Erick,
I would "butcher" it, but then I would add the ring (with screw to fix it) instead of flange. Actually, I am just in a process of adapting one such adapter for myself :-)
If you wish, I can try to organize this for you as well..
When I am finished I will post the pic so you can decide if this is for you or not.
Erick,
I would "butcher" it, but then I would add the ring (with screw to fix it) instead of flange. Actually, I am just in a process of adapting one such adapter for myself :-)
If you wish, I can try to organize this for you as well..
When I am finished I will post the pic so you can decide if this is for you or not.
Yes, I look forward to seeing your result. If I cut the flange off, the body of the adapter will disappear into the mount - no room for a ring
However, a bit more intelligent work in daylight with my existing bits and pieces might be all I need to do. Some months ago, I did get to focus using Ken's webcam adapter, so it must be possible - I'll pull the webcam body off and see where I can get the camera closer to the focuser.
Erick
When I was playing with my Quickcam, in order to achieve focus I un-soldered the CCD chip (it was TC255 in DIL8 package), then I mounted the socket instead. By inserting one or two sockets more I was able to move the CCD up (or closer to adapter) to enable focusing. This modification is also giving me the necessary space to insert peltier cooler...
Anyway, I will show you the result of this when I am finished.... I am doing this to attach Philips TouCam, which will be modified one rainy day in the near future :-)
I have always had excellent service and response from Jim Henson and his people at Scopestuff.
Cheers
Dennis
Oops! Yes, I am getting confused. I have actually enquired several times about things from Scopestuff and found Jim very responsive, in fact a couple of times I have managed to get him before he has gone home and received an answer within minutes of posting an email. Sorry for the confusion.
Erick
When I was playing with my Quickcam, in order to achieve focus I un-soldered the CCD chip (it was TC255 in DIL8 package), then I mounted the socket instead. By inserting one or two sockets more I was able to move the CCD up (or closer to adapter) to enable focusing. This modification is also giving me the necessary space to insert peltier cooler...
Anyway, I will show you the result of this when I am finished.... I am doing this to attach Philips TouCam, which will be modified one rainy day in the near future :-)
Did you get this sorted - I had a similar problem and solved it by getting the flange machined off a 2" 1 1/4" adaptor. I can send a pic if you are interested.
Did you get this sorted - I had a similar problem and solved it by getting the flange machined off a 2" 1 1/4" adaptor. I can send a pic if you are interested.
Peter, I would be interested in seeing a pic. I am having a similar problem and am not sure which is the best solution at this stage.
Here's what I did to get more inward travel - purchased new 2" -> 1 1/4" adaptor ($25). Got old one turned down to remove the flange. Replaced the thumbscrew with a grub screw. Before and after in the pics below...
I was able to reduce some length off the adapter and some of the threaded tube in the webcam which brought the CCD another 2mm closer to the focusser. I have had one test and it seemed that I was achieving focus now. Snake Valley starcamp will be my first opportunity to test further and, hopefully, try to capture some images.
Eric
Quote:
Originally Posted by peter_4059
Erick,
Did you get this sorted - I had a similar problem and solved it by getting the flange machined off a 2" 1 1/4" adaptor. I can send a pic if you are interested.
