Author Topic: Manual focus compacts?  (Read 1593 times)

  • Offline zpyder

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Manual focus compacts?
on: August 11, 2010, 12:35:46 PM
I have a bit of a problem with my microscope, in that it seems that whatever methods/options I can come up with to hook my SLR up to it, are going to cost a fair bit of money. Im left wondering if there are any good (but cheap) compacts out there that have the option for a manual focus mode? My old old old Pentax did.

Reason I ask is I already have a mount that should fit any compact, but sadly my SLR is about 0.5" too big to work. If I can find a compact with a small lens as well it actually could be better than an SLR solution for me.

Sadly my Olympus doesnt have a manual focus mode, and as the lens is recessed its not ideal.

Re:Manual focus compacts?
Reply #1 on: August 11, 2010, 12:51:04 PM
on some compacts "landscape" mode locks the focus to infinity, worth a try maybe?

  • Offline zpyder

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Re:Manual focus compacts?
Reply #2 on: August 11, 2010, 13:48:01 PM
Sadly it appears on the Olympus landscape still tries to focus.

  • Offline Serious

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Re:Manual focus compacts?
Reply #3 on: August 12, 2010, 03:41:38 AM
Depending on the eyepiece you might be able to use a connector intended to connect it to a telescope on your slr.

Might be worth checking as those are often fairly cheap.

  • Offline zpyder

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Re:Manual focus compacts?
Reply #4 on: August 12, 2010, 09:21:51 AM
Aye, Ive bit the bullet and ordered a T-ring and T-mount, AFAIK it should work, though sods law it wont. Stupid thing is because of the way the optics and things are itll still probably give me a worse picture than a half decent compact would.

  • Offline matt5cott

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Re:Manual focus compacts?
Reply #5 on: August 12, 2010, 12:34:44 PM
You need to get the apple focus ring 3 times faster Im told.

  • Offline Quixoticish

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Re:Manual focus compacts?
Reply #6 on: August 12, 2010, 13:28:52 PM
Quote from: matt5cott
You need to get the apple focus ring 3 times faster Im told.


 :mutley:

Re:Manual focus compacts?
Reply #7 on: August 12, 2010, 13:57:45 PM
OMG, its spreading.

Were going to have to take off and nuke the thread from orbit, its the only way to be sure!

  • Offline zpyder

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Re:Manual focus compacts?
Reply #8 on: August 17, 2010, 13:21:38 PM
Finally getting somewhere. I have a T-adapter for the camera. T-mounts not so good...first one I got is 1mm too small (I knew it probably wouldnt fit, but couldnt find one that was exact) but it rested on the trinoc eyepiece.

Second one *should* have fit, the eyepiece is 30mm and I found a 30mm adapter, but they bloomin sent a 22mm one. My trinoc eyepiece tube is 22mm though. Now Im just gutted that there was a piece of dust  (I hope) in the centre of the trinoc lens, given it a clean but not got any time to see what its like now till later.


Wasp spider head close up by Chris_Moody, on Flickr

  • Offline zpyder

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Re:Manual focus compacts?
Reply #9 on: August 17, 2010, 19:50:53 PM
I think that "flare" is something to do with light reflecting from somewhere, maybe the inside of the adaptor tube/ring. Below seems to have come out better by adjusting the camera exposure and compensating on -2, and then post processing the raw files to normal brightness.


hoverfly by Chris_Moody, on Flickr

Re:Manual focus compacts?
Reply #10 on: August 18, 2010, 08:38:55 AM
I get something like that if I use a UV filter on my macro lens, its probably caused by not fully multi-coated optics in the eyepiece.

could you try direct imaging without an eyepiece? you wont get the same magnification that way is the only problem and the focus travel may not be long enough.

  • Offline zpyder

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Re:Manual focus compacts?
Reply #11 on: August 18, 2010, 08:43:16 AM
No eyepiece involved. The SLR is mounted to the trinocular, only lenses involved are the lenses at the bottom of the scope, dont ask me what theyre called!

Its been suggested it might be due to the inside of the T-adaptor tube being slightly reflective on a microscopy forum, someones suggested using black paper around the inside of the tube to see if that helps, will give it a go later!


Re:Manual focus compacts?
Reply #12 on: August 18, 2010, 08:48:00 AM
if it is slightly reflective that could cause the problem, so worth a try. The best telescope eyepieces have all their non-glass surfaces painted matt black for exactly this reason. Id say its almost certainly reflections from somewhere, hopefully it is something like the inside of the tube because if its off the back of the main objective theres nothing you can do about it.

  • Offline zpyder

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Re:Manual focus compacts?
Reply #13 on: August 18, 2010, 09:22:00 AM
Pretty sure its the tube, people were posting pics of what theirs looked like when they had problems etc. You can see light on the sides when you look down the tube with the lights on! Its black but evidently a bit reflective.

I cant do much about it permanently as this is the 22mm tube the shop sent wrongly, as I wanted a 30mm one for the eyepiece tube, not trinocular mount!

Is there such a thing as a photoshop (or other program) tool to dynamically adjust/remove lens flares like this? Id have thought thered be a way to darken bright spots etc to make an image more uniform?

  • Offline zpyder

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Re:Manual focus compacts?
Reply #14 on: August 20, 2010, 21:45:59 PM
Putting a roll of black paper/card in the inside of the t-tube seems to have cut back the reflections enough to eliminate the flare!


Hoverfly by Chris_Moody, on Flickr

That or the 40D just kicks ass.

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