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  #1  
Old 7th June 2015
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30 quid one trick pony

So, here's a failed project. I decided to see if you can make a passable telescope out of a long photo lens and a telescope eyepiece.

Well I learned a lot about optics on the way, and to save you the pain of trying yourself, no you can't. Refractor telescopes are very different to camera lenses. Typically a telescope might have a 1100mm f11 achromat air spaced doublet that is hand aligned, a very long tube and a quality eyepeice. No other glass. A long camera lens will almost always have a second set of glass half way down the tube which acts as a mild teleconverter and makes the lens physically shorter but optically longer.

Furthermore the whole thing has to be mounted so it can be moved with friction but no sticktion. Well, I got the magnification but the images were awful. Then I got passable images but the magnification was nowhere near enough.

OK, so as part of this project I bought a 1970s Prinz Galaxy 400mm f6.3 lens with lovely clean glass. This is a preset aperture thing and has a total of four elements. It isn't that bad for thirty quid. I may keep it, equally I may sell it as I may have used it's one trick last night: Here we go, hand held with the Panasonic GX-7 set to electronic shutter.



:-)
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Old 7th June 2015
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Re: 30 quid one trick pony

That is a smashing photo!
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Old 7th June 2015
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Re: 30 quid one trick pony

That's a damned good moon shot for 30 quid!
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Old 7th June 2015
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Re: 30 quid one trick pony

And you didn't need a 15 quid tripod.
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Old 7th June 2015
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Re: 30 quid one trick pony

Quote:
Originally Posted by David M View Post
And you didn't need a 15 quid tripod.
Nobody needs a 15 quid tripod!
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Old 7th June 2015
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Re: 30 quid one trick pony

Quote:
Originally Posted by Zuiko View Post
Nobody needs a 15 quid tripod!
Exactly. Why shell out fifteen quid when you can get a bendy leg table tripod for one pound ninety nine. I know a bargain when I see one

P
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Old 7th June 2015
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Re: 30 quid one trick pony

A 15 quid ($25) tripod is the price point for a lot of dSLR users around here. Some are so sturdy I wouldn't trust them to support a flash.
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Old 7th June 2015
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Re: 30 quid one trick pony

You may have tried this already but you can mount close-up lenses on bellows to make a crude long lens. You can make apertures from black card. Stopping them down that way actually improved performance considerably in my experiments.
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Re: 30 quid one trick pony

Remarkable!
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Old 7th June 2015
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Re: 30 quid one trick pony

It's a pretty sharp moon shot. Better than I got from my mirror lens or my 500mm monster. And they were on a heavy tripod!

I'd keep on experimenting, if I were you.
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Re: 30 quid one trick pony

Well, I have learned a whole lot about amateur astronomy this past month.

As a hobby, it can be just like photography: If you have mega deep pockets you can just go out and buy the best there is. Thousands of pounds.

There are lots of new words to learn (like Plossl) and clever techniques and secrets.

The big difference is those guys are not afraid to grind their own optics (!)

P

Getting right down to earth, I am off to Midhurst this afternoon to watch Morris dance. And no, I won't be taking the huge black lens :-)
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Old 7th June 2015
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Re: 30 quid one trick pony

Wow and double wow! Pete, you've encouraged me to try my vintage Soligor 400mm F6.3 purchased when I first bought my Minolta SRT. Weighs a ton so I hope I've still got the strength to lift it! I'll be happy if I get anything nearly as good as your shot.
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Old 7th June 2015
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Re: 30 quid one trick pony

I ground the bottom of an old milk bottle into a lens, stuck it in a bit of old drain pipe, used a pair of specs for an eye piece and got this:

V



V



V



V



V



V



V



Off the Daily Mail Website...
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