- Back Focus Chart Printable
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- Back Focus Chart
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Back in Focus, Cabramatta, New South Wales, Australia. 372 likes 52 were here. Back in Focus strives to provide quality Chiropractic treatment to help you achieve overall health and wellbeing. INDICATIONS AND IMPORTANT SAFETY INFORMATION for the STAR S4 IR® Excimer Laser System and the iDESIGN® Refractive Studio Wavefront-Guided LASIK & Monovision LASIK Treatments. INDICATIONS: The STAR S4 IR® Excimer Laser System and the iDESIGN® Refractive Studio is indicated for wavefront-guided laser assisted in situ keratomileusis (LASIK) to achieve monovision. Back focus is the distance from the end of your eyepiece drawtube to the focal plane of your telescope. It varies greatly depending on the type of telescope: Schmidt-Cassegrain telescopes (SCTs) typically have generous back focus distances of approximately 5 in. Similarly, Maksutov-Cassegrains (Maks) also have large back focus distances. Whether you’re stuck on a problem you are trying to focus on or having trouble trying to. Technical Note: Back focus refers to the 'focal flange length'. This is the distance between the rear lens element and the CCD.
Backfocus measurements specify the distance between the back of your telescope and the point at which light is focused. You need to place your camera (or eyepiece) at this point to see an in-focus image. So, for example, if your telescope has a backfocus of 100mm, the plane of the sensor should be 100mm from the end of the telescope.
Where backfocus becomes really critical is when using things like focal reducers or field flatteners. These will have a specified backfocus requirement, and you will need to make sure your camera is at this distance to get the most out of this type of device.
Back Focus Chart Printable
Finding the Right Backfocus
The backfocus of a camera is the distance from the plane of the sensor to the front of the camera. These measurements are available on all of our astrophotography cameras.
Astrophotography Back Focus
To calculate the backfocus of your setup, add up the backfocus of all the separate components. For example, if we take an Atik 460EX camera, this has a backfocus of 13mm. If we then add in an EFW2 filter wheel, this has a backfocus of 22mm. Next up, we want to add our OAG. This adds another 24mm backfocus. So now we have 13 + 22 + 24 = 59mm backfocus.
To be at the correct distance for our example 100mm, we now need to add 41mm. You can do this using extension tubes or spacers. You’ll want to ensure you get within ±2mm of the specified backfocus requirement (check with your device manufacturer for the exact tolerance).
But what if the total specified backfocus you’re trying to reach is only, say, 50mm? This is where integrated systems like the Atik One can really help. The Integrated Kit combines a camera, filter wheel and off-axis guider that all comes in at just 47mm backfocus. Similarly, we designed our Electronic Filter Wheels so they add no backfocus onto the camera, only the spacing of the wheel itself.
It’s worth mentioning that with the Atik 16200 and EFW3, you can remove the front plate before attaching the wheel. This cuts down the backfocus for that setup from 41.5mm to just 34.5mm.
So is shorter better?
Shorter backfocuses can give you more flexibility with what you stick your camera on, and the other things you stick with it. They can also be useful if you’re looking to use smaller filters with larger sensors, as the close distance can cut down on vignetting.
However, there are also some problems with having a very short backfocus in a camera.
Condensation
One issue you can get is problems with condensation. Having the optical window very close to the cooled sensor is far more likely to create problems with condensation. By giving the camera a little more space here, you can avoid these problems. This makes for a more reliable imager, whatever the conditions outside. It also eliminates the need to use a window heater. For example, the Atik Horizon has a deep cooling delta of 40°C below ambient, but its 13mm backfocus combined with our advanced sealing methods and a high quality Quartz optical window, means it doesn’t suffer issues with condensation or dew, even without a heated window. This is also good news for the power consumption of the camera. Window heaters can draw a significant amount of power, and this can make a difference when using a mobile setup relying on battery packs.
Reflections
Another common issue is reflections. Again, with the optical window very close to the sensor, any light reflected off the cover glass of the sensor itself, is more likely to reflect back off the inside of the optical window and cause artefacts in your images. Having a little more space between the optical window and the sensor helps negate the occurrence of these artefacts.
Consistency
It can also be beneficial for us to keep a certain amount of consistency in backfocus across our range. For example, our 4-Series and the Horizon share a 13mm backfocus. This means that if you start out with an Atik Horizon and later decide to upgrade to an Atik 460EX CCD, it’s virtually as simple as swapping over the cameras, without having to worry about adjusting the spacing of the rest of your set up.
By Joel Fitzpatrick, KYODO NEWS - Mar 25, 2021 - 15:45 | Sports, All, Feature
Six seasons have passed since a Japanese driver has lined up on the Formula 1 grid, but the wait will soon be over with the debut of young charger Yuki Tsunoda in motor racing's premier class.
At just 20 years old and all of 160 centimeters tall, Tsunoda hardly cuts an imposing figure, but he has already proven to be a formidable force on his journey to a seat at the AlphaTauri team.
Back Focus Chart
He made headlines by clocking the second-fastest time at testing two weeks ago in Bahrain, only marginally behind superstar and Red Bull stablemate Max Verstappen.
Though variations in weather, car setups and team plans can make such preseason benchmarks appear more meaningful than they are, there is no shortage of positive signs for the Kanagawa Prefecture-born racer.
He racked up 185 total laps over the shortened three-day test, far fewer than his grid-leading teammate Pierre Gasly, but it was enough to allow him to settle into the confines of his cockpit.
'You can't get too ahead of yourself, as it's only testing, but it's great to finish the three days on a high,' Tsunoda said of his rapid lap.
With the lights set to go out on the season's first race at the same Middle Eastern track on Sunday, attention will turn to whether Tsunoda can unleash the skills that have gotten him this far when matched up against the best.
'I think for me it's great that we're returning here so soon for the start of the season, as I've managed to complete a lot of running here now and understand the track well,' he said.
Tsunoda is not shy about assessing his own abilities and hopes the familiar surroundings will help him shine.
'I think my strengths are braking and overtaking,' he told Japanese media in a press conference last week.
'Braking is important in F1...cornering all starts with braking, so if the braking is off, then it is difficult to know the behavior of the car and any changes it requires.'
The last Japanese driver to grace the grid was Kamui Kobayashi, an exciting prospect who never got a shot in the best F1 machinery. Kobayashi was the seventh Japanese driver to score championship points, and Tsunoda says he aims to be the next this year.
'I have no particular plan, I just want to score points,' Tsunoda said.
Veteran F1 journalist Joe Saward told Kyodo News the steady progression of Japanese drivers over the years is an indication that Tsunoda has a great shot to stick.
'We haven't really seen Yuki in action in Formula 1 yet, but I watch the Formula 2 races and was very impressed with him last year,' said Saward, whose opinion carries weight after covering 579 races since 1988 and publishing his own magazine, Grand Prix Plus. 'He's feisty and quick,' added the Briton.
Saward also said Tsunoda's strong English is a significant factor in his future, as he will not be hampered by a language barrier that has held back some Japanese drivers.
'He speaks English to a significant level, which means he will be able to communicate effectively with his engineers. This has often been a problem for Japanese drivers in the past, because one needs very precise language skills to get the most out of a modern F1 car.'
'It's hard to compare him to previous (Japanese) drivers, but in general, each generation has been better than the last,' Saward said.
In addition to learning English over the past few years, Tsunoda has had to work on his body, getting it into a condition to handle the rigors of a race distance.
'I have been working especially on my neck and my core,' he said. 'Especially after going to F1, because the G-forces are so large, much larger and incomparable to (cars I have driven in the past).'
'When I first ran an F1 car, there was so much load on my neck. On race simulations, I started to feel tired after 20 laps.'
If he has managed to get his body right, Tsunoda will put himself in a better position to replicate the promise he proved on track in 2020, his first and only season in Formula 2.
In that coronavirus-impacted season, the Japanese driver accumulated three wins -- two that came in each weekend's longer and more F1-relevant feature race -- with four pole positions and seven podium finishes.
Driving for the Carlin team, he finished third in the championship, one point off second, but more than results, it was his abundant racecraft that won fans.
In the final race of the 2020 F2 season, he demonstrated he can maintain poise under pressure.
He entered 2020's final race sitting fifth in the driver's championship and needing to at least hold that position to secure a so-called 'super license,' a minimum qualification to race in F1.
He took a victory from pole position in the feature race and then carved through the field from eighth to second in the reverse-grid sprint race, earning his largest points haul of the season and a two-place jump in the standings. But more importantly, he clipped his ticket to F1.
The ability to pull off the spectacular overtakes he required in that race is important, but he will need consistency to remain in the Red Bull fold.
AlphaTauri and its big brother Red Bull team have taken a ruthless approach to their young drivers in recent years and Tsunoda just has to look across the garage for a reminder.
His new French teammate Gasly was unceremoniously dumped from the Red Bull team in the middle of the 2019 season after failing to equal Verstappen. The driver who replaced him, Alex Albon, faced the same fate at the end of 2020 and is now set to drive in the German touring car series.
Honda Motor, which supplies engines to both AlphaTauri and Red Bull, is departing the sport at the end of the 2021 season, meaning Tsunoda will not be able to rely on the Japanese company's backing for much longer.
He will face a stern test against Gasly, 25, who had a spectacular return to form in 2020, winning the first race of his career in Monza, Italy, and the first for the AlphaTauri team since 2008, when it raced under the Toro Rosso name.
Tsunoda said after testing that he and the Frenchman have so far had a seamless relationship, with the more experienced driver helping him acclimatize to the challenge, 'especially with tire management in the race.'
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Gasly also offered praise for his teammate, saying, 'It's important to have two drivers who can deliver and Yuki did a good job at the test, doing a lot of laps, which is a good sign.'
'He made no mistakes and did everything that was asked of him,' Gasly added.
Tsunoda is in a win-win situation in his relationship with Gasly. Should he match him, the Japanese will have outperformed expectations, but should he be beaten he will be given the leeway afforded a rookie.
Back Focus Chart
But cordial inter-team relations are often fleeting in the intensely competitive world of F1, and the early promise the AlphaTauri team has shown this season means the pressure to perform will be on.
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Mar 25, 2021 | KYODO NEWS