Increasing contrast when working in black and white, this 4.5" Tiffen 4.5" Red 23A Filter for Photographyfrom Tiffen 4.5" Red 23A Filter for Photographyis used to noticeably darken cool and blue tones in order to emphasized both shadows and clouds. Offering greater tonal separation than regular yellow and orange contrast filters, the light-red 23A is especially well-suited to producing dramatic outdoor and landscape imagery. There is an approximate 4x filter factor with this filter, requiring an increase of 2 stops for normal exposure.

The filter is constructed using Tiffen's ColorCore technology, which involves lamenting the filter material between two pieces of optical glass, grounding flat to a tolerance of 1/10,000th of an inch, and mounting within an aluminum alloy ring.

Increases Black and White Contrast    Effect Corresponds to Wratten 23A Filter    Darkens Blue Tones    Lightens Red and Orange Tones    Reduces Haze in Daylight    4x Filter Factor, +2 Stop    Optical Glass, ColorCore Technology    Aluminum Ring

Light-red filter provides the same effect as a Wratten 23A contrast filter, and helps to darken blue tones while lightening warm orange and red tones, when photographing in black and white.

Commonly used for landscape photography to emphasize and darken blue skies and give clouds more visual depth.

Filter factor of 4 requires approximately 2 stops of additional exposure to maintain normal results.

ColorCore technology, which permanently laminates the filter material between two pieces of optical glass, maintains image clarity, accuracy, and consistency.

Aluminum filter ring is both lightweight and durable.

Related Questions and Answers

Q: 1. What is the difference between this lens filter & the Formatt Hitech Ultra version? [Formatt Hitech 77mm Firecrest Ultra ND 0.9 Filter (3-Stop)] Thanks.

A: The Ultra Firecrest series filters exhibit greater clarity and have lower reflectivity than the original Firecrest filters. Borrowing from the range of Firecrest cine filters, the Ultra series filters undergo a secondary lapping and polishing process after the initial polishing and bonding stage. This additional step helps to ensure flatness and consistency for improved image quality.

Q: 2. Is this nd high enough quality to use with a sony 24mm 1.4 gm or get a tiffen? And is the 6 stop nd a going to let me shoot video at 1.4 in the day time or do i need a high stop nd?

A: The Formatt Hitech 67mm Firecrest ND 1.8 Filter is high enough quality to use with a Sony 24mm 1.4 GM lens, using Schott glass with 15 layers of coating. When shooting video, with the camera set on the lowest ISO possible, set at a 60 fps, this 6 stop ND filter could work at f1.4.

Q: 3. Does this filter block IR spectrum?

A: It "attenuates" or reduces IR interference during long exposures to prevent color casts. It does not fully block IR.

Q: 4. Is this filter stackable with another circular filter?

A: It is with a filter of the same size or with a step up or down ring to the same size in this case 77mm.

Q: 5. Will this work on a Yashica A tlr?

A: Yes, the following unit adapts to Bay 1 and 32 mm filters

Q: 6. Will this protect the sensor of a D7000 when taking sunrise, and sun pictures? Will use Live View and not optical for viewing.

A: You will want a 18 stop Solar filter https://bhpho.to/2MFxXFU.

Q: 7. Will this filter fit inside the Wine Country Camera 150 mm x 150 mm filter vault? I see the Formatt Hitech is 4 mm thick. I think the Wine Country Blackstone filters are 2mm thick but I can find no information to verify this.

A: The Wine Country filter holders have 2mm slots, so that filter is not compatible.

Q: 8. Any problem with vignetting with the 77mm diameter at wide angle like 16mm? I am thinking of using it for canon 16-35mm f4

A: You shouldnt see any vignettes from the filter at 16mm.

Q: 9. Compatible with yashica mat 124g?

A: This is Bay 1 mount , double check I believe yashica mat 124g is also Bay1

Q: 10. Can this type of ND filter be used as stack up filter, 2-stop + 4-stop = 6-stop?

A: Yes you can , its always best not to stack filters