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Everything posted by happy-kat
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Finder bracket, nice idea, I'll probably add a red dot though I think mine will get more day time use. That looks neat how you mounted that bracket. The mak looks the same. When I can get a single bright object in view then either side of focus it is still round not that I see all of it. Confusing... Could you test please the shape you get through your one I used a 25mm and a 16mm both have the fan and not a circle.
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I have always found putting my eye in exactly the right place very annoying. Tonight I thought I would do an exit pupil test. Looks like there is a problem that is a fan shape. Colimating the heritage is easy compared to what I think this might be! I am still going ahead with the changes as I believe this issue has been here from day one. Before I twiddle the screws can anybody confirm please if a fan shape is normal for a Mak?
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C70 this test doesn't look good, I think this has always been off
happy-kat posted a gallery image in Member's Album
From the album: C70 Modifications
© happy-kat
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Just had a test, can focus on the stars and there is loads of focus travel left so I am reducing the number of card board rings and going to test again with the hope I can then focus on the bird feeders which are quite close in the garden. Though I have assumed to shorten might find out it was the other way!
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Initial test shows that the optics all line up as I could see my vegetable bed some 20 feet away but as expected far too close to reach optimun focus
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There are 6 collimation screws on the back of the C70 in three pairs of two.
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Removed the inbuilt prisim held on with three small screws. Made a cardboard test of the back so that I can test if focus is still possible on distant objects. The cardboard is holding the 1.25 eyepiece adaptor.
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From the album: C70 Modifications
© happy-kat
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From the album: C70 Modifications
© happy-kat
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The rear element was held on by two small alen keys. There is a lens in the rear element as well as the prisim in the back of the C70. I am very hopeful that removing all this lens stuff and replacing with a more typical diagonal will improve the view. Next job is remove that prisim it is held with a couple screws. Then I hope to fashion a cardboard back for my diagonal and an eyepiece to test focus.
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From the album: C70 Modifications
There is also a lens in the lid off the rear element case© happy-kat
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Took the rubber sleeve off today it is quite thick. The tube is plastic. The rear prism looks to be two torx head screws holding it on. A crude measurement does look promising that a diagonal will be in the same place for presenting the eyepiece.
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From the album: C70 Modifications
© happy-kat
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From the album: C70 Modifications
© happy-kat
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Seeing as maks have to cool down for optimum use does make me question the thick insulating rubber sleeve!
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So whilst the American version (or perhaps a year or two older model) sports a metal body under the rubber mine is plastic. Made a start today to understand how the C70 is covered. It is a rubber sleeve which is in two parts, the orange metal band covers the join. The sleeve has been stuck with a very hard dried glue down the centre seam. This could proove very hard to break the glued seal. Have been trying to pry the rubber sleeve with a plastic splodger seeing as the tube is actually plastic I don't want to use a metal splodger. One side has much less glue and lifted with a bit of a fight but did lift. The other side has a wider glued area (about 1cm) and it does not want to bodge. The plastic body fels quite strong it does not buckle. The length of my diagonal looks to be the same as the inbuild affair so I am not too concerned about focusing once the changes are done. Due to finding a plastic body I may have to rethink the end design but I will decide once it is all exposed.
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From the album: C70 Modifications
Starting to peel the rubber sleeve off, it has been stuck with a very glued glue but just down the centre seam© happy-kat
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From the album: C70 Modifications
Removed the end rubber ring and discovering how the main body rubber sleeve is fixed© happy-kat
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Thank you for replying. The c70 is not a mak like it's big brothers and the rear end does not have the expected arrangement. The c70 has after the back plate an inbuilt correct image 45 degree prism. My plan is to remove the inbuilt prism and replace with a diagonal of my choice. The c70 comes with the ability to use 1.25 eyepieces and I hope to use the adaptor fixed to a new piece of rear plate. There should be enough focus travel as I an swapping an inbuilt item to a separate item. The c70 lives is a moulded rubber sleeve that incorporates the prism I am just striping it back to reveal the mak. I will add photos as I go which should explain things.
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My winter project (well one of them) is to modify my Celstron c70 so that it loses the inbuilt 45 degree erecting prisim thing and I replace the back of it with a new flat plate and directly mount the 1.25 eyepeice adatpor to it. I have seen this done on a archived for sale thread on another forum. I have a friend who can make me the flat back plate but can't do the cutting a thread to make a male fixing for the adaptor. Are there any ideas on how I could get the right thread cut please so that I can screw the adaptor in? This is the 1.25 adaptor showing the female thread. (the adaptor is upside down) Very crudley the back plate would be round with a hole in it. The side view idea is if I made a raised area, could I then afterwards get a thread cut into it?
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Telrad died - replace or new finderscope?
happy-kat replied to sheeprug's topic in Getting Started General Help and Advice
spot of red nail polish on a clear one would do -
Telrad died - replace or new finderscope?
happy-kat replied to sheeprug's topic in Getting Started General Help and Advice
Astroboot might have a cheap optical finder then get both :-) -
Don't buy the Sony A5000/5100 for astrophotography
happy-kat replied to sharkmelley's topic in Discussions - Cameras
If you can not use a remote shutter trigger you wont get good photos. Using your finger will mean shaky blurred long exposure pictures. Sticky Velcro is very useful to stop stuff hanging. -
Why Canon for me as begginer, lots of support available, the raw files produced can be used by the many astro editing software programs. You can turn off on camera noise suppression You can drive your Canon from a PC or laptop or windows 8 tablet and in my case my small 7 inch android tablet very useful for just taking night sky photos plus old m42 lenses off ebay are cheap.