What is the difference between "Extention Tube" and "Close-up Diopters"? If both do no diff which one do you prefere?
600302
In my experience, the glass in the close-up diopter isn't as good as the glass in the lens and therefore the image quality is not as good, with extension tubes there is no glass to interfere with the lens optics, so the image quality is much better.
600303
A diopter adds glass in front of your lens so it may affect image quality depending on how good it is. An extension tube has no glass but simply moves your lens away from the sensor changing the magnification and focal distance. I prefer an extension tube. Be sure the extension tube you buy passes the electronic signal through for auto focus. Hope this helps!
64369
Because of the difference I would suggest buying 1 pair in each of the diopters you need and swapping out the lenses. For me the difference was only 1 point so I went up a half. They've worked out great.
2050377
This lens is for close up pictures at relatively short distances. The other is a telephoto lens for taking close ups of larger items at longer distances.
1627784
Rather than this, if I want to get closer than my macro ring allows I use some extension rings. They allow closer focus but add no extra glass to go through. I have a different brand I purchased for the same amount, so something like this Movo Photo AF Macro Extension Tube Set for Micro 4/3 Mount Mirrorless Camera System (Compatible with Olympus PEN, Panasonic Lumix, Blackmagic Cinema Camera) with 10mm, 16mm & 21mm Tubes
1058013
The Dob will definitely give you more deep space objects than the refractor. I got my son one of those last Christmas. It is rather large in comparison to the refractor, but rotates well on its base. His is not computerized and he has gotten very adept at finding nebulae and Messier objects. I think the refractor is more for planets and moons in our close by system. Visual tracking is okay, remember that the image is reversed in the Dob.
1529155
Hi Penelope. I am a bird photographer. This converter will bring the image closer. However, I prefer the 2.2x lens which screws on top of the 75-300 lens because the clarity is superior and the focusing faster. You can call us anytime for this information or email us. Cheers
744737
I haven't tried Kenko, but I was not impressed with the Zeikos extension tubes. They we're not good at auto focusing at all?
2259984
I used it for a little while but I returned it because the focus wasn't as sharp as I would have liked. The diopter adjusted but not far enough.
1033980
Using an extension tube changes the optics of the lens. One result is the range at which your lens will focus is reduced. When I use the EF 12 II with my 24-105 mm my autofocus still works. However I am closer to the subject than I could normally be (without the extension tube) & still focus this lens. So the extension tube does magnify but it also decreases the focus range.
242
These are nitrogen purged as are most quality binoculars. Some manufactures now offer argon purge but genrally considered higher cost with minimal additional benefits. There is a single adjustment in middle for both tubes. The right eyepiece has the fine focus so that you can adjust for vision differences between you eyes.
1507806
They're like "readers" with correction for close-up only at the bottom of the lens. If you are target shooting, I would think you'd want distance correction, not close range as a reader provides.
176602
Its nice to have the extra 20mm for low light applications. Cost is a factor though, depends on what you want to use it for. I think the larger unit is better for a number of different aplications
133762
I think this is the difference: Features twist-up eyecups and a large center-focus knob for easy adjustments; I used two pairs in South Africa on some safaris and they were amazing! Glad I bought two pairs for my friends an my family!
1548627
There are two primary differences. First, the Kenko tubes are fully automatic, that is, using them (if compatible with your camera model) will preserve the automatic features of your camera, including the metering. The tubes have the conducting pins that line up between your lens and the camera body and communicate the exposure to your meter. My opinion is if you only do the once in a blue moon macro, the less expensive tubes might suffice. If you are either sophisticated at manually calculating exposure that should not be a problem, or just take a broad series of exposures and some will probably be right or salvageable in Lightroom or other post processing. However this is somewhat tedious, if not laborious, and if you intend to take macros on a regular basis, the auto tubes will be worth it. The other difference is manufacturing quality. Tubes that are not well manufactured are either too lose, allowing slop in the set up or too tight, causing nightmares in removing a tube that seems stuck to your precious camera or lens. The Kenko works great on my D7100, and before that on my D7000 and my D80. Snug fit, but not too tight. Also the "release pin" can be problematic in cheap tubes. This Australian guy, Matt Granger or something like that, has a nice You Tube video demonstrating these tubes. That should be easy to find searching You Tube I spent the extra dollars on Kenko and have not been sorry. If you really want to do macros on the cheap, just buy a reversing ring, screw your lens in backwards(no joke!)using the filter threads and you have a pretty good set up, but not nearly as flexible as with the tubes. Also a shorter prime lens is probably a better choice for the reversing ring approach. Good luck!
2259983
I have found it only to be a slight adjustment. If you take it off the camera then move it in front of something close to focus on. Adjust the ring and you will see a slight difference. Personally I don't use the diopter after initial focus.
1455986
I actually like this one better:http://www.tamron.com/en/photolens/di_II_all_in_one/b008.html
1450082
This is not an extension tube. This item requires a connecting ring in order to use a 18/55mm lens in a reverse position for macro photography. it is good to have it because it allows you to open or close the objective diaphragm.