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MTF

ImageJMTF

MTF testing is the measurement of the ability of optical systems to transfer various levels of detail from an object to an image. Performance is measured in terms of contrast (the intensity difference between the image’s black and white regions) and accounts for real-world factors like optical blurring.

Modulation transfer function

Since the introduction of linear system analyses to the optics field, demand for higher quality, higher resolution optical systems has increased. Designers and metrology scientists have turned to modulation transfer function (MTF) testing as a standardized method of optical system characterization.

FOV and focal length

An MTF test bench’s calculations are contrasted as a function of spatial frequency within a two-, or three-dimensional coordinate system. This function reveals how well-resolved an object is based on its size.

So what exactly are the negatives I’ve refered to? Well, whilst it’s great having a tool at your disposal, relying on a magnifier is a whole different thing. Its bright lighted area and magnification cause havoc with your eyes. And stitching with daylight lamps when it’s not daylight can cause problems with sleep cycles too. However, the biggest issue is that magnification requires a lot of eye use, and it’s very common for people to get involved in what they’re doing and not taking regular breaks. For those with good eyesight, this can have long term effects on your eye health, and for those who already have eye issues, it can make is substantially worse. That doesn’t mean you have to give up cross stitch if you rely on one though; magnifiers are great to use non-regularly, so consider stitching less, lighting your stitching area better, or reducing the count of your fabric so its easier on the eyes.

I initially planned on using my magnifier on a few small count projects, think 32 count, however before I got to that point I ended up pulling it out to check something on my cross stitch project using 14 count. I would normally have squinted or pulled it close to my face, but for the first time ever, I could just use a magnifier to see it with ease! Not only that, but cross stitching on black aida has been made considerably easier with the massive light source the magnifier has brought me. I actually use my magnifier a lot, far more than I thought I would, and whilst the super magnification area gets a lot less use, it being there means I have something to use a back up if I still can’t get that dang stitch to lie properly. Clip-on magnifier by 123stitch

I recently won the best miniature cross stitch in the National Needlecraft Awards this year with my miniature traditional pirate samplers and as a result I won a fancy magnifying light. This was the first one I ever got, and whilst it gave me loads of ideas for miniature cross stitch, I didn’t realize the problems it would have. mini pirate cross stitch samplers by Lord Libidan (source: xstitchmag.com)

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MTF testingMastercard

Read on to learn more about MTF testing, its benefits, common methods of evaluating lens resolution, and MTF and resolution testing components.

In the past, when sensors only offered at most 640 pixels, it was easy to make an imaging lens that could outperform the camera’s sensor. Today, with pixel sizes less than 1 micron,  pixel count on sensors have significantly increased —sensors now regularly have over six million pixels. To keep up with this technological advancement and provide superior image quality, lens performance must increase, and measuring how well a lens performs requires the correct metrology. This is where resolution and modulation transfer function (MTF) testing comes in.

Resolution and MTF testing are critical in constructing the proper lens specifications. At FISBA, we specialize in metrology and are committed to delivering products that have undergone rigorous testing to ensure they meet the highest quality and performance requirements. To learn more about our metrology capabilities visit this page: Metrology & Test. Our highly experienced engineers and precision assembly teams use industry-standard test methods and can design and build custom solutions to meet your unique needs. Talk to an expert to get a conversation started.

All in all, I think magnifiers are a fantastic tool for a cross stitcher, even those without issues seeing things in detail (why strain your eyes when you don’t have to) however they should be used as a tool in your armory, rather than something to rely on all the time. If you are one of those who need it regularly, try reducing your aida count, or using a smaller magnification, taking regular breaks and lighting up your stitching area as much as possible with natural light.

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I have an LED lamp which has the light underneath shining down on my work. I also am long sited so wear glasses. I find it more relaxing using this magnifying lamp, it is bright, shines down and the focus is brilliant. I haven’t experienced any problems. Just success – yay