Those photons count a lot when the exit pupil is so small! We did use the Barlow with the 20mm lens but we couldn't see anything and yes we did take the lens cap off (after the first try!! The train I use has a Paracorr position, and is available here. Achromatic vs Apochromatic refracting telescopes. By the way, your first target should be the moon. Differences and Similarities Explained, This Is How Humans Will Get Water On Mars. Most commonly, we dismount the camera lens, mount the adapter with camera, this array replaces the eyepiece. Anything beyond that is handled with a Barlow. Once you have more experience and you feel the need to try fancier eyepieces, then might only end up using Barlows occasionally unless you want them for a specific purpose, such as increased eye relief. Between the New Forest and Cranborne Chase. The higher the magnification, the dimmer the resulting image. Tele Vue DeLite 3 mm has 20 mm of eye relief. Have one to sell? They are in the $25 to $65 range. This lash-up doubles the magnification of the eyepiece. * You save space by not having as many eyepieces, * More expensive to purchase individually. I prefer as wide an AFOV as possible, and long eye relief as possible as I benefit from wearing my glasses while observing. Astro-Photography with Maksutov-Cassegrain Telescope and Canon EOS? If If you were to operate this scope at 125X, the image will be quite dim but still usable. Especially when taking photos. And having not had one, I don't really know how to judge their performance vs. just an eyepiece. The instructions that came with the telescope could be written in chinese for all the help it has given!!! Press Esc to cancel. You should probably explore the 2021 Eyepiece Buyer's Guide, Published by Eyepiecesetc.com. I haven't really tested it extensively, but at 6mm exit pupil with my glasses I still see astigmatism related to my eye (it moves when my eye moves so I know it isn't the scope). It was like looking through a straw with blurry stars at the perimeter. While the mirror may be capable of 700X, the atmosphere may hold you well below that. If you are planning to get budget eyepieces then getting a lot of them might not be that big of a deal. In my case, this barlow lens and bundled high power eyepiece together gave about 120% of the maximum, and image quality get degraded a little. http://www.skyandtela-pupil-primer/. It's easy! We discover the magnification realized when we mount an eyepiece by division. The most obvious one is cost. Astro scopes generally won't focus on things closer than 50-100 feet away, sometimes further than that. A good barlow is nearly indistiguishable from a single eyepiece at half the focal length (assuming a 2x barlow). Free shipping Free shipping Free shipping. The 3 eyepieces I use for planets are 14mm, 8.8mm, and 6.7mm, all are Meade 4000 series eyepieces, they give me 14mm, 10.5mm, 8.8mm, 7mm, 6.7mm, 6.6mm, 5mm, 4.4mm, and also 3.35mm, this covers a lot, I have never successfully viewed below 5mm as conditions have never been good enough in my back yard which is bortle 7+, I have only been to a dark site 3 times and did not look at planets. Do you have tracking available? My question is what will be the difference in the viewing experience? We set the scope up for visual observing. Both. Buy 1.25" 1.5X Erecting Eyepiece Barlow Lens for 1.25 Inch Port Astronomical Telescope Ocular Plastic for 8.04 usd in the online store Eyesdon Store. Twice now, I have maxed out the 3-6 Nagler and the Baader barlow on my 15" (~1830mm, as Paracorr'ed). You can easily measure seconds accurately. If we then went further, say using a 5mm eyepiece which would generate magnification of x140, we might have a problem, because here we are getting close to the theoretical maximum of the scope and this where the quality of the mirror comes into play. First, do you own a Barlow or are you asking if you should buy one. It only takes a minute to sign up. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Well you have certainly come to the right place for advice as there is plenty of experience here for you to draw upon. Thanks for contributing an answer to Photography Stack Exchange! 1.25 Inch 1.5X Erecting Eyepiece Barlow Lens for 1.25 Inch Port Astronomica I2X9. But its not motorized we have to track it manually. Pentax SMC XW 3.5 has 20 mm of eye relief. Theres also the possibility of introducing optical errors such as chromatic aberrations. If you are using lower end eye pieces, your experience could actually be better with a Barlow. Way to create these kind of "gravitional waves". Which One is Better? $30.99 5% off . If you have a 200 mm or 300 mm f/2.8 or f/4 camera lens, it will be good for the stellar exposures (better optical correction too). All is revealed to you in more glorious detail. A Barlow lens works to achieve Option One. The greater the clear aperture, the less chance there will be of vignetting due to the light being cut off by the edges of the Barlow lens cell. For visual use, 1.5X, 2X, 2.5X, and 3X Barlow lenses are common. Look for a Barlow with lenses that are fully multi-coated; this will enhance light throughput and prevent scattered light. Click to enlarge. Or it could just be no good, the Barlows that come with cheap scopes often are poor. I wear glasses and could never use EPs with 5-7mm of relief. My next EP up is a 9mm, so barlowing it is not really useful as a 2x basically makes it the same as my 5mm. Also there is a 1.5 x Erecting Eyepiece - what is it for? Instead of having to bring a huge case full of a dozen eyepieces, you only need two or three and a couple of Barlows. As Paul says, for astronomy use, the upside down view is the one to get used to as the erecting eyepiece will detract from the quality of the view. This objective lens has a focal length of 400mm (15 ). Omni 9mm Eyepiece - 1.25" Learn More. Astigmatism goes away once you get to the smaller exit pupil at higher magnification (say 1mm - 0.5mm). I probably got carried away with half a mile, try something 100 - 200 yards away! For beginners, Barlows are the most practical and economical method to get access to many magnification levels. Edited by aeajr, 12 August 2021 - 04:41 PM. Should get a fair amount of use in that scope. For example, the Klee Barlow sold by University Optics has one of the smallest clear apertures among standard Barlows, so its performance suffers in comparison to others. This size of eyepiece is very good in providing a wide view of the night sky and can be helpful in either locating objects such as planets, or it can help provide a wide enough view to contain the target object such as with the pleiades (or seven sisters as its more popularly termed), being a constellation of very bright stars that are impressive to look at. The barlow operates at about 2.5x with the ADC. Save money for a better scope. Generally low end EPs have short eye relief. So if your 10mm has 15mm of relief then adding a 2X Barlow gives you a 5mm view with 15mm of relief versus the 5-7 that a low end 5mm EP has. What is the basic gear for astrophotography? Where can I find the maximum camera weight for my lens? It increases the power. By using this site, you agree to our Terms of Use. Why is the plural of the verb used in Genesis 35:7? So there Is no general rule on in-focus for a barlow, or generally how a barlow changes the focus point? Would prefer if my perception obeyed the formula. When I said I maxed it out with the Baader barlow, that was at over 1300x. Omni 6mm Eyepiece - 1.25" . My 5.5 took me to 276X but I could Barlow my 8.8 in the 2X for 345X often enough to justify another eyepiece. Time exposure is super daunting and the telescope must track, with precision, the objects you are imaging. I've been observing quite a few years and there have only been a 'handful' of nights I got my 22" to around 450-500x which is the max I had for eyepieces at the time. If you go the eyepiece route, consider simpler designs like orthos. This will be an acquired skill. Also I agree withSupernova74 on the fact thathigher magnification doesnt necessarily mean you will see more. In your setup mentioned this would take your 5mm T6 Nagler to about 600X. Best Celestron Telescope Eyepieces: Buying Guide, Prism vs Mirror Telescope Diagonals. Read several pages there, there are several versions. Modern quality Barlows create very little light loss and should not introduce much in the way of aberrations. Legacy Reviewer's Review of Zhumell Par-Focal 1.25 Inches 1.5x Erecting Eyepiece 1.25-1.5XERECT-NO. However, this effect is very dependent on the quality of the lenses or mirrors that are being used. forget about the erecting image the makers of these scope just throw a lot items to make the scope look like it has a lot acessiors BUT most those items are low quality stuff. Add to Cart. Your scope is an entry level instrument designed for ease of operation delivering a direct view. Try using just the 20mm eyepiece to start with and then try the barlow with that eyepiece. Place the big lens with the curved side up into the larger diameter end of the spacer. Again many thanks for your warm welcome and advice given so far. The quality and cost of both the Barlow or eyepieces that you plan to get also play a big role. This device holds the camera and the eyepiece. A Barlow is an auxiliary lens system in a tube that mounts in front of the focal. Everything You Need To Know, Best Telescope Covers: The Definitive Buying Guide. Because of the additional magnification, you can gain increased sharpness and definition. Abut 600X But only 62 degree AFOV. A Barlow is a two element negative lens that adds magnification by expanding the image scale. The 1.25 inch 2x TeleVue Barlow is nice because it's parfocal, no need to change the Paracorr setting when swapping it in and out. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. It doesn't have to be a Powermate. If cost is not a factor than eye relief would be the major benefit of the Barlow. Abot 600X Lens and tripod for deep space photography. Even the $25 to $65 Barlows do a good job with my ES 82s and my Baader Hyperion 8-24 Zoom. When my 8" Dob was my largest scope I had a 5.5 mm that took it to 225X. A Barlow is going to allow you to instantly double the number of magnifications you can use with your telescope. How to get even thickness on a curving mesh when rotated on a different direction. You currently have javascript disabled. . A good wide view in addition to a magnified view would certainly help you to enjoy the moon, planets, clusters and the brighter deep sky objects. of any eyepiece used with the telescope by increasing the telescope's effective. Having it is one of the reasons that I don't have a set of high power orthos. To identify what max exit pupil you can use for observing without being affected by astigmatism you need to use the following formula: Where Cylinder is a positive value of your "Cylinders" in diopters from your eyeglass prescription. So maybe I should look at something in that range. Great for exploring higher powers with longer eyepieces that have longer eye relief. There is the extremely transparent and sharp Nikon EiC-16 1.6X Barlow which retails for about $$200 USD. We have placed cookies on your device to help make this website better. An eyepiece AND a Barlow? AS the other guy above said its to look at daytime stuff altho most people who want to do that don't get reflecting scopes anyway. I need to take photos of planets and nebula with this, and I can't afford an equatorial mount. I'm sure more experienced observers could but they all seem pretty good to me. One final category of eyepiece is the eyepiece with illuminated reticles. The camera is fitted to this adapter with the camera lens dismounted. Since i'm designed around the SIPS - I have to use the SIPS/paracor element otherwise nothing reaches focus. Astronomers usually desire more magnification from their telescopes. They are black boxes in general. but now I have found SGL I will be asking for advice. Your scope has an objective lens (up front lens) that is 70mm in diameter ( 2 inches). Your D3300 24 megapixels should allow extreme crop to magnify greatly. When seeing permits, the mirror can definitely handle a lot more. Anyway, a 7mm plus a 2x Barlow would provide natural increments in conjunction with your 5: 257x, 360x, 514x, and 720x. I usually pick the furthest TV aerial that I can see from my garden. I will definitely take a look at that buyers guide! In this article, well compare both methods so you can make an informed decision and pick the ones that better fits your particular situation. That should work well with your glasses. The 1.5x erecting prism will be used when using the scope for terrestrial objects to make the view the right way up. Chain Puzzle: Video Games #02 - Fish Is You, How can I change outer part of hair to remove pinkish hue - photoshop CC. This not only reduces the investment you have to put into your accessories but saves a lot of space when you want to take your telescope into the field. What happends with the ownership of land where the land owner no longer exsists? I like using a barlow to reach high power with my scope. If you use an eyepiece with a shorter focal length to increase the magnification, you get shorter eye relief and only one magnification. Do you know if you still benefit from glasses at the resulting exit pupil (~0.6-0.7mm)? What are some general rules for astrophotography? Pretty much just like eyepieces alone. While the mirror may be capable of 700X, the atmosphere may hold you well below that. You can effectively double the number of eyepieces in your collection. I've found that Jupiter certainly doesn't like getting close to 2D. YMMV, but see what's other people are saying about seeing - pretty much the same. That is obviously going to be better with the Barlow because of the extra magnification. We have, up our sleeves, several methods of mounting a camera to a telescope. That is almost always not provided. Personally, I can't tell a lot of difference with my Barlows. The Celestron 70mm is f/5.7. (Since magnification equals telescope focal length divided by eyepiece. A plossl will give twice that of 50 degree noty to mention it will be much much better quality, and a super plossl will be 52 degree fov. Every time you add an element to the optical chain of a telescope you are going to lose a little bit of light, and therefore brightness at the very least. I will go to 357x when seeing permits, but unfortunately that is not common. I had to get a recessed adapter for the illuminated reticle eyepiece I use for lining up the DSC. Many people use orthoscopic eyepieces for the detail they are able to produce. Hi BamBam, it is possible that you were too close to the object that you were trying to focus on, what distance was it? But I don't really know. Because of this, people that wear glasses prefer to use a Barlow lens in their setup. Even if you use this scope only for visual observing, you might be disappointed. But its heavy, and after a back injury a few years ago I am struggling with it plus viewing off a ladder. Cost is only a couple of hinges and a long screw. In terms of usability, focal extenders maintain the eye relief of the eyepiece being used, while Barlows generally increase . So I added a 4.7 mm for 323X. Should be very adequate mounted on the tripod you have. rev2022.11.14.43032. That would require a 2.7mm EP. 1.25 Inch 1.5X Erecting Eyepiece Barlow Lens for 1.25 Inch Port Astronomica F9S8. Was J.R.R. What's the funniest thing someone said about viewing with your scope? One of the most common questions beginner stargazers have when it comes to telescope accessories is if it is better to get a collection of eyepieces of different magnification or if using Barlow lenses is better. So if your 10mm has 15mm of relief then adding a 2X Barlow gives you a 5mm view with 15mm of relief versus the 5-7 that a low end 5mm EP has. Most of the time it's between 1.6D - 1.7D. Hello everyone again, we have followed your advice and taken the telescope out in the day to get use to start getting use to the finderscope and the telescope in general. That's normal. Pentax SMC XW 3.5 has 20 mm of eye relief. It increases the telescope focal length. The eyepiece projection can be many times more magnification (and much more difficult). No need to use this for astronomy targets as it does not matter what way up these are. Given that, it served well. Personally, I prefer another eyepiece to a Barlow, but I keep the Barlow around just in case. After a long search I found some affordable EQ mounts. I have a 4.7mm I have never used for planets that would also be 3.5, and 2.3mm, I carry it in my eyepiece case but have never used it for planets so far, I used it once to look at the Moon when it first arrived as a test. There have been a few things I have only seen at max mag on great nights. You can take a closer look here at these eyepieces and in particular you need to look at the top middle box and the bottom left hand corner box with regards to the sizes available. But, when the conditions allow it is nice to be able to push. I wear glasses and could never use EPs with 5-7mm of relief. We can squeeze out more but it will be empty magnification. A seven element eyepiece with 98% transmission at each front surface only lets through (0.98)^7 ~ 86%. View the moon and other stars and planets, or land based animals and scenic views comfortably with with the aid of the erecting dual eyepiece. 500x is exceedingly rare here for planets and 700x isn't happeningalthough I have had such conditions elsewhere. Several functions may not work. Eyepiece Exit Pupil and Astigmatism Distance from hinge to screw has been computed to match the screw thread pitch, so the tracking idea is one screw revolution per minute. Dont pay much attention to the definition of the image. Image not available. The simple, more transmissive, eyepieces usually have small fields. With a good Barlow lens from a reputable brand, you are not going to see a noticeable difference in the quality of the image. but at the moment we are trying to get use to scope in daylight so only operating out of our garden at the moment. But budgetary cost savings it isn't. BTW, which scope are you using? I have an eye exam tomorrow, so I'll run the calc. Community Forum Software by IP.BoardLicensed to: Cloudy Nights, This is not recommended for shared computers. By Which is why I'm looking for cost effective options. Is the new 20" Dob replacing your beautiful custom made 22" F/4 Dob, and why? Seben are infamous for making some truly awful scopes, but I believe yours isn't one of them. Now, as to why use a Barlow vs. an eyepiece? Example 'Both': 1200 mm TFL 5 mm EFL = 240x. If I recall from the last time, I'll be very close to the same as you. There can be reasons when one want's to do that, sure. September 24, 2007. Your scope came with a 10mm and 20mm eyepiece. Each type has its own distinct advantages and disadvantages. A barlow is a tool, it can expand your powers at a fraction of the cost of more eyepieces. Thanks for this formula. In my opinion same goes to exit pupil diameter and so on,however I can truly relate if your one of those amateurs who do where glasses when its more crucial to partner your eyepiece collection with your scope to achieve maximum. Edited by aeajr, 12 August 2021 - 10:59 PM. So taking the 20mm eyepiece that came with your scope, we can calculate that 700mm divided by 20mm gives us a magnification of x35 which is well within the limits of your scope. Thanks for all your responses, we will be back in the garden practising again tomorrow!

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