The Heliopan 55mm #15 Dark Yellow Filter is a basic contrast filter, primarily for use with black and white film, that very strongly darkens skies and blues, increases contrast, and is often used for outdoor photography to emphasize contrast and shadows. There is an approximate 4x filter factor with this filter, requiring an increase of 2 stops for normal exposure.

The front and rear surfaces of the filter both feature a single anti-reflection coating. Each coating helps to increase light transmission by reducing reflections, scattered light, and ghosting. Additionally, they offer protection to the filter substrate while helping to keep the glass clean for longer than uncoated glass.

This Heliopan filter is constructed from Schott glass for increased optical clarity and color fidelity. It features a brass filter ring for durability as well as jamming prevention.

#15 Filter for Enhanced B&W Contrast    4x Filter Factor, +2 Stops    55mm Front Filter Threads    Front and Rear Coating    Schott Glass Construction    Brass Filter Ring

Dark yellow contrast filter for black and white film strongly darkens skies and blue tones, cuts through haze, and increases overall contrast.

Commonly used for landscape photography to emphasize blue skies and give clouds more visual depth. Also used for aerial and micro photography applications where added contrast can be used to enhance detail.

Single coatings on both the front and rear offer protection to the glass and help to improve light transmission and image quality.

Constructed from Schott glass for optical clarity.

Brass filter ring helps to prevent jamming and provides additional strength.

Dual threading with 55mm front filter threads permits combining with other filters.

Related Questions and Answers

Q: 1. Does this lens compatible with cameras that utilize dual-pixel autofocus?

A: It works excellent on my 70D,which is dual pixel.

Q: 2. I have E-mount lens,can I change to RF mount?

A: E mount to RF mount, either way is not possible.

Q: 3. How's this lens compared to the 50mm 1.4? Price factor is Alot.. (Using on Sony a7rii)

A: The 50 gives a bit more contrast and is a touch sharper, You also get the on lens AF switch and aperture.However. I'm a huge fan of the 55, it just feels right on the camera, my issue with a lot of glass on the A7 series is that it can feel too big. the 55 is small and light and an amazing performer.

Q: 4. How much does this lens weigh?

A: Weight (Approx.) : 10 oz. (281g)

Q: 5. How is this lens on the 90D? Are the images sharp and in focus if shot correctly?

A: The Canon EF-S 17-55mm f/2.8 IS USM Lens is a very good lens on the 90D. I feel it is one of the best for the Non-Canon L models. And even better than some L lenses. It is one of the sharpest. It is unlike the L models not weather sealed.

Q: 6. is this weather sealed?

A: Hi! This lens is dust and moisture resistant. -Anthony

Q: 7. Are zoom servos and controllers available for these lenses?

A: Yes, there is the Chrosziel Compact Zoom Control V2 Kit (SKU: CHCDMMKZ2) https://www.bhphotovideo.com/c/product/1520043-REG/chrosziel_cdm_mk_z2_mk_zoom_ii_lens.html , which would be compatible with these lenses and controllable with a standard LANC controller, such as the VariZoom VZ-Rock (SKU: VAVZROCK) https://www.bhphotovideo.com/c/product/330007-REG/VariZoom_VZ_ROCK_VZRock_Variable_Rocker_for_LANC.html

Q: 8. Is the ring on the lease a focus ring or a zoom ring? And if its a focus ring, is there any way of setting it into a zoom ring on the Sony A7?

A: This is a prime lens. It is only 55mm nothing else. So the focus ring is only a focus ring. Since this lens has only one focal length it stays and always will stay at 55mm. It is an excellent prime lens. If you want sharp. This is the lens to get. If you want a multiple focal lengths (zoom) in a lens you need to find another lens.

Q: 9. does this lens have image stabilization feature?

A: No this lens does not have image stabilization. So far, only the FE zoom lenses have that feature, not the primes. However, the Sonnar t* FE 55mm f1.8 ZA is one incredible lens even without stabilization -- very sharp, almost no chromatic aberration or distortion and beautiful color rendition and bokeh. It gives my Leica Summicron 40mm and Summilux 50mm lenses a run for their money and has quick and accurate autofocus to boot. (Of course they do not have stabilization either and cost several times as much.) You just need to be careful with your shutter speed -- try to keep it at or above 1/125 and there should be no blur issue from shutter speed\. Since it renders great images wide open, you should still get great images. Of course if you are trying to get more depth of field with higher f-stops, try and be as steady as you can when the speeds get slower either bracing your camera with your arms lower on your body and using the tilt screen to frame the image instead of using the eye-level viewfinder or steadying the camera using a tripod,

Q: 10. I'm considering upgrading to a R8 from a T7i, will this lens be compatible for the R8 and T7i?

A: The Canon EF-S 17-55mm f/2.8 IS USM Lens will be compatible with the Canon R8 while using the Canon Mount Adapter EF-EOS R. Please be aware that this lens will crop the sensor of the R8, resulting in a loss of Megapixels. This is because the Canon EF-S 17-55mm f/2.8 IS USM Lens is designed for APS-C cameras.