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Lenses for Canon 300D
- Keith g
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- Super Giant
How do you find manual focus out in the dark using the autofocus 18-55mm lens? It's probably not easy, is it frustrating to get a sharp as possible shot?
Thanks,
Keith..
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- James Butler
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I have trouble with AF too but it's not a simple case of setting to infinite. When I come in from the cold the lens is always just off infinite, one way or the other.
You could do what I did and make a mini-Hartmann mask. Look at my blog here james.butler.name/weblog/astrodiary/2005...ndoor-astronomy.html for the instructions. Note that this will only work with bright objects. A single bright star will have most of its light blocked afore it hits the sensor so use it during the day to set up.
I have a 200mm fixed focus USM / EF lens. A zoom version would add a lot to the price. You could try another manufacturer and use T-adaptors. I have an old 500mm mirror lens from Vivitar that I have an adaptor for. Don't buy mirror lenses for astrophotography though. Cheap, great magnification, useless in low light. Even some shots I did of the sun spots were awful.
Software like DSLRFocus will also help with focusing. The website www.dslrfocus.com also has a wiring diagram to make a combined exposure bulb and focus cable that integrates with the software and finds the right focus for you.
An alternative is to do prime focus or eyepiece projection with your scope so you don't need any camera lenses.
James Butler
Astronomy Diary - astronomy-diary.blogspot.com/
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- michaeloconnell
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However, I followed from advice from Michael Scully and Dave Lillis who recommended I should mark the lens during the day.
I simply pointed the camera at a distant object, set the lens to 18mm and autofocused. Then I made a small mark on both parts of the plastic casing around the lens. I repeated the procedure at the 55mm setting. Once the weather clears I'll test it out. Hopefully it'll work.
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- dave_lillis
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- Super Giant
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)
Carrying around my 20" obsession is going to kill me,
but what a way to go.
+ 12"LX200, MK67, Meade2045, 4"refractor
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- dave_lillis
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- Super Giant
Focusing the 300d is something I have found difficult lately.
However, I followed from advice from Michael Scully and Dave Lillis who recommended I should mark the lens during the day.
I simply pointed the camera at a distant object, set the lens to 18mm and autofocused. Then I made a small mark on both parts of the plastic casing around the lens. I repeated the procedure at the 55mm setting. Once the weather clears I'll test it out. Hopefully it'll work.
:oops: a tiny mark on the PLASTIC, not the lens :lol:
Another shamless advertisment, but I'm going to make up a number of these DSLR focus cables so you can fully control you 300D from a computer/laptop,
All going well, I'll have them for Cosmos, I'll put up an add in the "For Sale" section when the time comes.
Just thought I'd give advance nortice.
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)
Carrying around my 20" obsession is going to kill me,
but what a way to go.
+ 12"LX200, MK67, Meade2045, 4"refractor
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- Seanie_Morris
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All going well, I'll have them for Cosmos, I'll put up an add in the "For Sale" section when the time comes.
Are you also going to be looking for a stall? I'll charge you rent, or a cable or three in lieu of!
:lol:
Seanie.
Midlands Astronomy Club.
Radio Presenter (Midlands 103), Space Enthusiast, Astronomy Outreach Co-ordinator.
Former IFAS Chairperson and Secretary.
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