Ministry of Education and Science of the Russian Federation

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Ministry of Education and Science of the Russian Federation

Federal State Autonomous Educational Institution of higher education

«National Research University ITMO»

Engineering Research Faculty

REPORT

Laboratory work №3

« Analysis of the quality of photographic objectives in the OPAL PC program and selection of digital cameras»

by discipline «Introduction into applied optics»

Completed by: ________________

Version №: _______________

Associate professor

Anna Voznesenskaya

Saint-Petersburg

1. Goal of the work: analyze the quality of photographic objectives using the OPAL PC software and select a digital camera.

2. Tasks:

1) Create an optical lens system - select from the library of photo lenses of the OPAL program (File/Library of optical systems/LENS) according to the specified characteristics (see the individual task in the Annex):

- angular field of the lens 2w_о_b. not less than specified;

- lens f-number f_о (Relative aperture. =1: f_о_b) not more than specified;

- the focal length of the lens f'_ob does not differ more / less than 2 times from the specified one.

2) Determine the paraxial characteristics, the back section, the number of lenses and the dimensions of the objective.

3) Determine the values of the front and rear apertures A_y, A_y’ (Run/Basic analysis/Apertures and pupils (F6-text)).

4) Determine the values of the field of view (object field) 2w and the image height 2y (Run/Basic analysis/Principal rays).

4) Determine Lateral Aberrations ∆ y’ (Run/Basic analysis/On-axis point aberrations/Transverse aberrations).

5) Explore the contrast transfer function of the objective, determine the value of the resolution ν at a contrast level of 0. 2. (Run/Image analysis/Geometrical analysis/Geometrical MTF(F6-text)).

6) Copy Fig. 1 (Path of rays in the optical system) from the OPAL program and build Fig. 2 (Diagram of the optical system) in the AutoCAD program, using the design parameters of the photo lens from the OPAL program..

7) Using the given dimensions of the CCD matrix, determine its diagonal, calculate the crop factor and equivalent focal length, examples of two digital cameras suitable for the crop factor (https: //en. wikipedia. org/wiki/Charge-coupled_device, https: //en. wikipedia. org/wiki/Crop_factor) and determine the equivalent focal length of digital cameras (https: //en. wikipedia. org/wiki/35_mm_equivalent_focal_length).

3. The content of the work

Table 1. Characteristics of a film photo lens (see below)

Figure 1. Path of rays in the optical system

Figure 2. Diagram of the optical system

CCD diagonal d =

Crop factor =

Equivalent focal length f ’_eq=

Picked digital cameras:

4. Conclusion

Table 1. Digital Cameras Specifications

Brand

Back focal length

Relative aperture

Object field

Image height

Back section

Front aperture

Rear aperture

Lateral aberration

Resolution

ν, lin/mm

Number of lenses

Dimensions

f', mm

1: f

2w, º

2y’, mm

S’, mm

A, mm

A’, º

∆ y’, мм

center

edge

(LxD), mm

Annex. Tasks

Full Name	2w, º	Relative aperture 1: k	Focal length f ', mm	CCD size, mm
		1: 5		8 х 6
		1: 4		35 х 24
		1: 6		4. 8 х 3. 6
		1: 4		8 х 6
		1: 3		4 х 3
		1: 4		27 х 18
		1: 2		5. 8 х 4. 3
		1: 4		8 х 6
		1: 4		7. 6 х 5. 7
		1: 3		4 х 3

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