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I have been busy of late, trying to finish off my rebuild of a 14" newt - and we're almost there! (I do a fuller post when it's up and running).
I am at the point of trying to set the back focus (the tubes are fairly close to length, but they will need a little trim...).
This is going to be used for mostly imaging - what are people's preferred back focus distances? Currently, I have about 32mm from the fully racked in position to the focal plane (worked out by very stopped down solar projection). I'll be using an MPCC, so I'll need 55mm I think - does increasing the backfocus to about 65mm sound about right here?
Clearly don't want to vignette too much, but still need to reach focus...!
I haven’t spotted many southern hemisphere members here yet, but they’re probably lurking somewhere?... By way of introduction, I’m a semi-retired, burnt out academic and have been a sky-watcher most of my life. Here on the top of a very remote Australian mountain range, there are few distractions (lousy TV, internet etc.), and a crystal-clear sky most nights; no humidity and no pollution. Wouldn’t swap it for the world! - (not that I’m trying to make anyone jealous or anything). I’m looking forward to sharing our astro-experiences and related thoughts.
By Messier 104
Hi everyone new to stargazers lounge.
I am 24 years old, been very interested in space and everything about it throughout my life. I live in Bristol in the UK and have a big problem with light pollution although I do manage to get out "in the sticks" quite often for a darker site.
about a year ago I started taking interest in visual astronomy and my love and knowledge for it has been growing ever since.
got my first telescope in may 2016 and would love advice anyone with experience can give.
I have a sky watcher 150P scope and a range of eyepieces from 6.3mm to 40mm, a 2x barlow lense (low quality) and a 3x celestron X-cel barlow.
my biggest interests are DSO (deep sky objects) but I have never been able to observe comets. any advice on equipment or technique will be very appreciated but Id really like to know how is best to get the most out of my scope for deep sky objects and any comets in the near future that are reasonably easy to find.
I just bought an Istar 150mm F12 lens and cell and will be building the telescope to hold it. The guy I bought it from has generously given me some excellent advice, so I know where I will get the aluminium tube and how I will cut it, how I will plan the light path and baffles, and how I will flock it internally. He also suggested a couple of focusers that he has used and likes. I think I will probably go for a Moonlite focuser as I have one on a newtonian and I really like the smoothness and precision of it, but I am also considering a couple of others. Do any of you have either the TS Monorail or the Baader Steeltrack? What do you like and dislike about them?
I will be using the scope for visual observing only and the heaviest eyepiece I will use on it will be my Explore Scientific 30mm 82° at 1.4kg.
I have been looking through the forums sections of this site and found that nichrome wire is a very popular material for dew heaters. I was using my DSLR a several weeks back, and the dew was horrible and it encouraged me to build a nichrome heater.
My first heater prototype consisted of 22" of wire with a resistance of 4.08 ohm per foot connected directly into a 12V power supply (consisting of 8 AA batteries in parallel). It was wrapped in duck tape. It worked for a while, but then the batteries began to overheat and I had to pull the heater out to let them cool.
When I used the same prototype heater on 6V (4 AA batteries) it didn't have this same overheating issue, but it produced less heat then when it was on 12V.
I'm not using a pulse width modulator, but would that solve this issue?
I'm worried as the heater is only really around 8 ohm, it may be short circuiting with such little resistance. The wire can't be terribly long as this is just to heat a DSLR lens. Any input on a solution would be greatly appreciated.