Calculating Focal Length of a Converging Lens?

Calculating Focal Length of a converging lens?

Calculating Focal Length of a Converging Lens? 1

Here's the formula: 1/s 1/s' = 1/f where s is the object distance and s' is the image distance Solving for f, f = s*s'/(ss') = 0.2 m You are welcome...

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Yongnuo YN-685 underexposure issue in bounce mode at longer focal length

This is a known bug with Yongnuo flashes (notably the YN-685's predecessors, the YN-568EX and YN-568EX II). TTL tends to be inaccurate and will underexpose unless you switch the metering mode from Evaluative to Average (see: this DPReview discussion, where one person claims Yongnuo support themselves suggested switching to Average metering). This is, after all, a $100 reverse-engineer flash of cheap Chinese manufacture. While it may have some feature parity with Canon's flashes, it will always lag behind on copy and component consistency, backwards/future compatibility, warranty service, and resale value. They are great for hobbyist usage, less so for professional usage. While their QA has gotten noticeably better since the days of the notorious Strobist review of the YN-560, the low-low price has gotta come from somewhere. And if it's a new model and you are an early adopter, you may still be an inadvertent beta tester. Yongnuo has many quirks, and the fact that aficionados can tell you where to find manufacture date codes and which dates align with which silent updates is only one sign of this.You may want to look into Godox's Wistro (bare bulb) and Ving (speedlight) flashes, Phottix's Mitros speedlights, or (if you want to go manual-only speedlight) LumoPro's LP180R for pro hardiness and reliability-not to mention better trigger interoperability (Yongnuo's got three separate triggering systems-none of which work together) if you still want to go third party vs. OEM. The Flash Havoc blog is a good source for what is out there.Most folks purchase a YN-685 simply to have a cheap YN-622C off-camera slave. I love my Yonguo gear for off-camera, but for on-camera bouncing, I will grab my 580EXII first, every time.

Calculating Focal Length of a Converging Lens? 2

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If light through a convex lens focuses light to a point 5 cm from the lens, then the focal length is ....?

The light is focused at 5cm from the optic centre. So the focal length is 5cm

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How does a focal reducer effect the focal length of a telescope and therefore the mag power?

A focal reducer has a positive power (diopters). It will bring parallel light to a focus. This is opposite from a Barlow lens, which will spread out parallel light. The position of a focal reducer before the focal point of the telescope makes the incoming cone of light become steeper in angle as it refracts the light to a new focus point. This point is closer to the primary mirror (or lens, in case of a refractor). Some focus adjustment of the optical system must be done to bring the system to a focus where it was for eye lenses or an imaging detector. The resulting effective focal length is reduced by the factor printed on the lens. In your case, it is 0.63X. This means that when using the same eyepieces, magnifications are reduced by the same factor. The advantage of the focal reducer is that the apparent field diameter is increase by the inverse of the factor, 1/0.63 or 1.587 times wider views. And the time needed for the same exposure of astrophotos is reduced as well. The system's F number is lowered by that factor. This comes at a price, however. There is slightly less light passing through the system, as the lens absorbs a bit, and the coatings are not perfect, but might reflect 1-2% of the incoming light. Some minor lens aberrations may be introduced as well, but usually these are mostly corrected by using multiple elements. More expensive focal reducers are well designed and matched for the system where they will be used. No free lunch in optics.

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Physics question: the objective lens of a telescope has a focal length of 5.6 m.....?

Preetham - you might have asked this question a few instances in one-of-a-kind types. My private response for every of your questions is: "sorry, no longer much." if you relatively need to proceed with astronomy as you claim to your profile, then you will need to get a more severe way to do it. I realize that you may not be competent to manage to pay for a excellent telescope, however I fear that purchasing an inferior telescope, as described in each of your entries, will handiest result in frustration. You would - significantly - do better with a decent binocular. The crucial criterion here is aperture. Now not magnification, now not focal length, but the dimension of the target - whether or not it's a lens or a mirror. At 90 mm as quoted right here, you will see the planets and not so much else. If you wish to relatively see whatever, i might propose an aperture not less than eight inches. This may increasingly normally force you toward a Dobsonian reflector design. There's a reason why these are so preferred. Dobsonians will permit you to peer essentially the most astronomical goals for the least sum of money. That's a easy reality. I would tremendously recommend that you to find the nearest neighborhood beginner astronomy club and attend a couple of open watching classes. You are going to get an possibility to see what works and what does not, and you will get an notion of what to assume on the eyepiece and at the money register. Do not rush out and buy an inferior scope with out doing a little research. There is no replacement for "are trying before you purchase. ".

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