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Greynerd
Guest
You can buy red dot sights for astronomical telescopes. They are often put on telescopes instead of the finder scope.
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Sp-100 24-1200mm with Red Dot site built in.
- Thread starter phazelag
- Start date
Oh? Well I knew people used red dot sights on telescopes... but the only ones I've seen myself, were still sights that were designed for guns (just coupled with a mounting for a telescope). I'm not an astronomer though :-D
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phazelag
Veteran Member
Wow that good information as I plan to use mine at airshows too. I may pick one up. Did you need a 55 to 58 mm step up ring to put it on?
Thanks
phazelag
Veteran Member
Yes Greynerd I,
I have used Red dot on my scopes since 1997 on my first Dobsonian. I wont use scope with out one. But all of my scope sites are not ideal for my camera as mine are sticky tape mounted with three adjustment knobs for calibration. But I am sure there are great ones now that would be great on cameras.
Yes, if you're using a genuine LA7 tube.
However, there is a splittable adapter tube you can buy on eBay, that has 58mm threads and therefore takes the TC-DC58A without needing a stepup ring.
That tube is handy because you can leave one half of it on the FZ200 as a bit of lens-barrel protection, it doesn't cause any vignetting at full wide angle.
Leave the other half on the teleconverter, and it's somewhat easier to add/remove in the field...
G
Greynerd
Guest
It is sad to that Dobson has just died. There was a big obituary for him in the times. He seemed a really interesting and generous character.
I have a red dot sight with the mount glued to my bird scope which does me for star gazing.
I have a red dot sight with the mount glued to my bird scope which does me for star gazing.
phazelag
Veteran Member
Hatstand,
I actually already have the splittable tube adapter on order. Hoping it comes soon. I just tested my Nikon 1.5 and the vignetting starts below 6x zoom on the display. So I dont think it will be huge issue, but just in case, I am going to try the Canon. Do you use a lens hood with your canon 1.5?
Thanks
You can get down to about 4x zoom with the Canon.
I don't use a lens hood with it, which is occasionally problematic... but it has no filter threads, and it's quite a diameter at the front. Not sure if there's anything suitable commercially available.
I suppose it wouldn't be too hard to make/fit a lens hood myself, but it hasn't bothered me enough to make the effort... and it would need to be quite sizable.
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clearzoom
Veteran Member
I am ordering this red dot sight for first time.
is it easy to attach this
is it easy to attach this
clearzoom
Veteran Member
Mike Did the red dot and extend thing worked.
do we really need that extend a sight.
clearzoom
Veteran Member
Hatstand - with Canon TC-DC58A, what adapter do I need to use for FZ200 ?
same way, what adapter do i need for TCON-17
LT55 being panasonic, can i use this without adapter
Michael Geary
Forum Enthusiast
It works great on my E-P5!
You do need the Xtend-a-Sight Plus or similar bracket, because the red dot sights are made for mounting on the sight rail of a gun. The Xtend-a-Sight is that rail with a hotshoe mount underneath it.
Brando sells a red dot sight bundled with a bracket, but I seem to recall a mention here that it wasn't as good quality as the Xtend-a-Sight. It is cheaper than buying the two separately though. If you search for "red dot sight" on Amazon you'll see a number of them including this red-green sight which is the same one that Brando bundles. This same item is sold under a LOT of different names, some red-green and some red only. (The red-only ones have more different levels of brightness.)
clearzoom
Veteran Member
This Mike geary
feel better to know these detail. I wI'll try one that comes with the sight first
feel better to know these detail. I wI'll try one that comes with the sight first
For the FZ200, all teleconverters need an adapter tube, because teleconverters are too heavy to attach directly to the FZ200 lens. You'd likely damage the zoom motor.
The Panasonic adapter (LA-7) has 55mm threads, so the LT55 fits to it directly. I don't know what threads the TCON-17 has, but I think that's 55mm too?
Canon TC-DC58A has 58mm threads, so the LA-7 tube needs a 55mm to 58mm stepup ring to mount it.
There is a 3rd party adapter tube available from Chinese (or Hong Kong?) sellers on eBay, which is splittable and has 58mm threads. This will take the TC-DC58A directly with no stepup ring. (LT55 would need a stepdown ring with this tube)
Being splittable has benefits, you can leave one half on the camera as a lens barrel protector (it doesn't cause vignetting), and one half on the TC. It can be quicker/easier to add/remove the TC in the field this way. You may also find the tube provides something extra to grip.
I have two of those splittable tubes, they both work fine for me - but there was one person who posted on here with problems fitting one to their FZ200. Sounded like threads were not quite right, maybe a quality control issues, so beware...
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clearzoom
Veteran Member
This Hatstand. For details
i have to pick one. I had thought pana being native to fez , would not need one
i have to pick one. I had thought pana being native to fez , would not need one
clearzoom
Veteran Member
Forgot to add one thing would these adapters not reduce the iq of fz200 as it sits on the lens and change the optics
The adapter tubes do not change the optics... except if you zoom out far enough, you will actually see the tube in your photo.
The adapter tube encloses the camera's lens barrel, and the camera lens operates as normal inside the tube. The teleconverter sits on the end of the tube, and just acts like a magnifying glass.
A "perfect" teleconverter of this type has no effect on aperture values, image quality etc, it simply presents a magnified image to the camera lens.
However, teleconverters are NOT perfect. The Nikon's are generally regarded as the best, minimal optical distortion and absorption by the glass. The Canon is very close. Everything else is apparently not so good - although in the real world, I have had great results from my Panasonic LT55.
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clearzoom
Veteran Member
Some FZ200 + LT55 airshow photos --> HERE
They're post-processed and reduced for forums though, so not sure how useful.
#3 was at the maximum 1020mm equivelent.
They were all hand-held. Shutter speeds were typically 1/200th or less in order to blur the propellers (about 1/60th for the ones with a "full-disc" propeller blur). 2-stop Neutral Density filter was used to get those slow shutter speeds on such a bright day.
And Image Stabilisation was turned off...
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clearzoom
Veteran Member
very nice job on shooting thiose images. planes stands off and really clear and shows good IQ.
I am not sure if I can do this hand held
but am going to practice Birds aroudn 800-1200mm as they are in the middle or far end of the lakeKeyboard shortcuts
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