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Tot

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About Tot

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    Nebula

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    Nottingham, UK
  1. I'm going on this info found online: "The compatible Maksutov-Cassegrains have a baffle tube diameter of approx. 30 mm. In theory, one might doubt that a 2" eyepiece makes sense here. But we can say: it does! If using eyepieces with larger field stops, the image does not become dark at once but slowly from the perimeter to the edge. The human brain can compensate brightness differences up to approx. 15%. As long as an illumination of 85% is acceptable, the usable field stop diameter rises to 40 mm and you significantly gain field of view."
  2. Do I need, firstly, this https://www.firstlightoptics.com/adapters/lynxastro_makcas-sct_adptr.html And then also one of these https://www.firstlightoptics.com/adapters/astro-essentials-2-visual-back-eyepiece-holder-for-sct-telescopes.html ?
  3. Hi Getting confused by the huge array of adapters I might need to be able to use my 2" push in diagonal and 2" eyepieces with a recently acquired secondhand Skymax-127. Do I first of all need a Mak to Sct adapter and then also an Sct to 2" adapter? Any help appreciated.
  4. Hi I'm trying to choose a new scope. I started with a Skywatcher Explorer 130P on the Synscan AZ GoTo mount years ago. I then bought an Orion XT10i dob, which I love, for the aperture and faint fuzzy abilities. Sessions with it are few and far between though but when it gets out to dark skies it's a treat. But now I want to own a frac as well, something a bit more portable for 'everyday' use. I already have an eyepiece collection, telrad, dew heaters etc built up over the years. But I will need a mount for the new frac, it'll be too heavy for that AZ GoTo. The budget for both OTA and mount is around £500, hopefully. i have a dob tent/observing tent that I hope to use with the frac's focuser/eyepiece actually being just inside the tent (not like the dob where the eyepieces are at the other end of the OTA so invariably you end up just outside not inside the thing! ). Inescapable invasive street lighting is a major problem at home, where most observing will be done, so I'm looking forward to setting up just inside the obsy tent so that the eyepiece end at least be in total darkness. Dew shields will help for the other end! Point is, I'm thinking a longer rather than shorter OTA would be better. If there were push-to mounts like the XT10i for a frac I'd get one right away. it's great being able to just manually swing the scope round to any part of the sky so quickly, no set up to speak of. Although the AZ GoTo mount worked perfectly well I didn't really care for the noise it made, waiting for it to slew and the faff sometimes involved getting star alignments done. The XT10i though meant I could either use that as a simple dob mount or do a quick alignment then use it as PushTo, with the mount handset indicating by arrows where to point the scope. No motors involved. As I'm not aware of such a mount for a frac I'm thinking of getting a simple EQ mount that can later be fitted with motors, handset etc to make it GoTo for those times I need or want computer assistance locating things. The frac will be used mostly for visual observing, but I have an astro-adapted Philips webcam and a basic DSLR so may well try very simple AP. I actually have an EQ platform for the big dob so that might get some more use if I can set the frac up on it. With all of the above in mind I'm considering the Bresser Refractor AR102/1000 on EXOS 2 mount. Scope not too big so will get more use (can be a pain hauling the big dob around the kitchen and garden). Mount fine for now and could be motorised and made GoTo if I wanted. Does anyone have any advice, ideas, alternatives? Thanks in advance. To
  5. Thanks for that info Scooot. Great to know that it is possible (but I fear too pricey for me). Cheers,
  6. Hi I'm trying to choose a new scope. I started with a Skywatcher Explorer 130P on the Synscan AZ GoTo mount years ago. I then bought an Orion XT10i dob, which I love, for the aperture and faint fuzzy abilities. Sessions with it are few and far between though but when it gets out to dark skies it's a treat. But now I want to own a frac as well, something a bit more portable for 'everyday' use. I already have an eyepiece collection, telrad, dew heaters etc built up over the years. But I will need a mount for the new frac, it'll be too heavy for that AZ GoTo. The budget for both OTA and mount is around £500, hopefully. i have a dob tent/observing tent that I hope to use with the frac's focuser/eyepiece actually being just inside the tent (not like the dob where the eyepieces are at the other end of the OTA so invariably you end up just outside not inside the thing! ). Inescapable invasive street lighting is a major problem at home, where most observing will be done, so I'm looking forward to setting up just inside the obsy tent so that the eyepiece end at least be in total darkness. Dew shields will help for the other end! Point is, I'm thinking a longer rather than shorter OTA would be better. If there were push-to mounts like the XT10i for a frac I'd get one right away. it's great being able to just manually swing the scope round to any part of the sky so quickly, no set up to speak of. Although the AZ GoTo mount worked perfectly well I didn't really care for the noise it made, waiting for it to slew and the faff sometimes involved getting star alignments done. The XT10i though meant I could either use that as a simple dob mount or do a quick alignment then use it as PushTo, with the mount handset indicating by arrows where to point the scope. No motors involved. As I'm not aware of such a mount for a frac I'm thinking of getting a simple EQ mount that can later be fitted with motors, handset etc to make it GoTo for those times I need or want computer assistance locating things. The frac will be used mostly for visual observing, but I have an astro-adapted Philips webcam and a basic DSLR so may well try very simple AP. I actually have an EQ platform for the big dob so that might get some more use if I can set the frac up on it. With all of the above in mind I'm considering the Bresser Refractor AR102/1000 on EXOS 2 mount. Scope not too big so will get more use (can be a pain hauling the big dob around the kitchen and garden). Mount fine for now and could be motorised and made GoTo if I wanted. Does anyone have any advice, ideas, alternatives? Thanks in advance. Tot
  7. Whilst collimating my bins I somehow managed to lose one of the four tiny collimation screws. Does anyone happen to know what screws these are eg thread size, length? It was going so well, gradually merging the two images, but then nothing happened even though I thought I was still turning the screw. Doh! The screw had actually come out, lost forever. :-)
  8. Thank you, Peter. Now off to find some M4 5mm screws!
  9. Does anyone happen to know the size of the small, black, flat-tipped, philips head screws that hold the primary mirror cell in place. These are the screws on the outside of the OTA at the end, just above the black "collar" of the mirror cell. Thanks.
  10. Ha ha! Ok. I'm sort of looking forward to the poor weather that I am going to experience at my house over the next few days. May those who don't live in my vicinity have beautiful, crisp, clear skies. Better? :-)
  11. The coming wet weather is the perfect opportunity to treat my baby to some upgrades and mods. My XT10i is to be pampered with: Telrad finder on a 4" riser Primary mirror cooling fan Protostar flocking Bob's Knobs on secondary Moonlite CR2 focuser Fingers crossed it all goes well and my baby will be even more wonderful. :-)
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