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How to change the iris setting on the nikon D40?

Ii am trying to work my nikon d40 on manual setting. When i do this the picture is way to dark and i cant figure out how to change the iris setting. Also if anyone found any video to help me out with a manual settings on this camera please tell me.

M Mode: Manual Exposure

The rear dial sets the shutter speed in manual exposure. To set the aperture, hold the +/- (*) (diaphragm) button near the shutter and turn the rear dial.

Sorry, I couldn't find you a video of the adjustment. Do you still have your owner's manual? It should help too.

I got that from Ken Rockwell. Knew I shouldn't have trusted him, after he called manual mode useless. Sorry!

OFP-SG Mod Manual Iris Test (BXBX's "Bluegate")

1/3" Image Format Black 4-9mm Manual IR Iris Lens $12.49

Varifocal Length 2.8~10mm w/Manual Iris $54.00

Varifocal Length 6~60mm w/Manual Iris $89.00

Varifocal Length 3.5~8mm w/Manual Iris $35.00

8mm F1.2 Monofocal Manual Iris Lens for CCTV Camera $6.34

Mace Security Lens-660a 6-60mm F1.6 Varifocal Manual Perp Iris Lens Cs Mnt For $76.54

Rainbow L582VCS 1/3" 5.5 - 82.5mm Varifocal Manual Iris CCTV Lens $135.00

NEW FUJINON DF12B-SND4-1 TV LENS 1:1.2/12mm Fixed Focal Length Manual Focus Iris $73.41

PENTAX CCTV C70316 1/3" 3-8mm CS Mount Manual Iris Lens Surveillance DAY NIGHT $24.47

1/3" Format 6-15mm Manual Iris Lens for CCTV Camera $19.83

CBC ZC-D5550NH CAM-1/3" 540TVL DOME W/5-50MM MANUAL IRIS $426.00

TAMRON 12VM1040ASIR 10-40mm F/1.4 IR C MOUNT, MANUAL IRIS $114.00

TAMRON M13VM288IR 3 MEGA PIXEL/IR CORRECTED 1/3 VARIFOCAL/MANUAL IRIS 2.8-8 $122.00

CBC H2Z0414C-MP 1/2 4-8MM F1.4 MEGAPIXEL, MANUAL IRIS LENS $152.00

TAMRON M13VM246 2.4-6mm F/1.2 Mega Pixel Manual Iris $126.00

TAMRON M118FM25 1/1.8" 25MM F/1.6 MANUAL IRIS W/LOCK MEGA PIXEL $189.00

ARM ELECTRONIC C380MD2VMI ARM COL 380LOR 2.6-6MM MANUAL IRIS $122.00

TAMRON 12VM412ASIR MANUAL IRIS LENS 4-12MM 1/2" $143.00

TAMRON 13VM20100AS 1/3" 20-100mm/1.6 Aspherical Manual Iris $131.00

TAMRON M13VM550 1/3 MEGAPIXEL VARIFOCAL LENS 5-50MM F/1.4 MANUAL IRIS CS MT $211.00

CBC M3Z1228C-MP 2/3" Megapixel 12-36mm varifocal, Manual Iris, C-mount $223.00

TAMRON M12VM412 1/2" 4-12MM F/1.4 MANUAL IRIS MEGA PIXEL LENS $203.00

ARECONT VISION M2514-MP Computar 25mm, 2/3in, f1.4, Manual Iris $207.00

ASIA SECURITY 880MPMIF14 8-80MM VARI-FOCAL 1/2in MANUAL IRIS $242.00

CBC H3Z4518CS-MPIR 1/2" 4.5-13.2MM CS D/N IR 3MP MANUAL IRIS $250.00

TAMRON USA 13VM2812ASII 30" 2.8-12 1.4 PSY MANUAL IRIS $53.00

ARM ELECTRONIC VL550MI ARM 5-50MM MANUAL IRIS LENS $62.00

TAMRON 13VM550ASII 5-50mm F/1.4 Aspherical manual iris CS m $88.00

TAMRON 13FM28IR 1/3 2.8MM F/1.2 IR MANUAL IRIS $58.00

ARM ELECTRONIC VL5100MI ARM 5-100 MANUAL IRIS V/F 1/3" CS MOUNT $101.00

CBC T10Z0513CS Varifocal MANUAL IRIS CS MOUNT 1/3 5-50mm f1.3 w/iris & focu $95.00

TAMRON 13VM308AS 3-8mm F/1.0 Aspherical manual iris CS mo $34.00

ACTI PLEN0107 MEGAPIXEL LENS,CS MOUNT,F3.5 8MM,1/3",MANUAL IRIS $34.00

ARM ELECTRONIC VL2812MI ARM 2.8-12MM VARIFOCAL MANUAL IRIS LENS $37.00

ScanSys KK660M 6 60 mm, F1.4,CS,1/3",43.6 4.3, Manual Iris $44.00

TAMRON 13VM35814 TAM 3.5-8MM MANUAL IRIS $49.00

HIKVISION TV0515DMPIR IRIS MANUAL FOCAL LENGTH 4.5-10MM $39.00

CCTV Replacement 12mm F1.2 CS Manual IR Fixed Iris Lens $6.92

1/3" Format 8mm Focal Length Monofocal Manual Iris Lens $6.23

1/3" Image Format Black 4-9mm Manual IR Iris Lens $12.39

CCTV Camera Replacement 4-9mm Manual IR Board Iris Lens $12.32

CCTV Replacement 12mm F1.2 CS Manual IR Fixed Iris Lens $10.88

Manual Iris 6-15mm Zoom CCTV and Video Camera lens 1/3" for Surveillance camera $9.99

CCTV Camera F1.4 Aperture Monofocal Manual Iris Lens $11.89

CCTV Camera 1/3 Formate 16mm Monofocal Manual Iris Lens $6.74

3.5-8.0mm Varifocal Manual Iris Lens for CCTV Camera $17.88

F1.4 Monofocal Manual Iris Lens for Safety CCTV Camera $11.86

Replacement 12mm CCTV Camera Manual Fixed Iris Lens $6.95

1/3" Format 6-15mm Manual Iris Lens for CCTV Camera $19.91

8mm F1.2 Monofocal Manual Iris Lens for CCTV Camera $6.28

Manual Focus 16mm IR Fixed Iris Lens for CCTV Camera $11.13

8mm F1.2 Monofocal Manual Iris Lens for CCTV Camera $6.34

Safety 16mm Monofocal Manual Iris Lens for CCTV Camera $6.60

CCTV Camera Replacement F1.4 Monofocal Manual Iris Lens $11.68

F1.4 3.5-8.0mm Varifocal Manual Iris Lens for CCTV Camera $17.71

Replacement 16mm CCTV Camera Monofocal Manual Iris Lens $6.80

CCTV Camera 1/3 Formate 16mm Monofocal Manual Iris Lens $7.09

2pcs New 1/3" CS manual IRIS 3.5-8MM CCTV Lens for color B/W Camera $19.90

Replacement 4mm CCTV Camera Monofocal Manual Iris Lens $7.82

COSMICAR PENTAX NEW CCTV LENS C30811 8.5mm F1.5 2/3" Manual Iris C-Mount C815B $34.26

1/3" Image Format Black 4-9mm Manual IR Iris Lens $12.09

COSMICAR PENTAX NEW CCTV LENS C61215 12mm F/1.2 Manual Iris C-MOUNT F1.2 1/2" $39.15

F1.4 3.5-8.0mm Varifocal Manual Iris Lens for CCTV Camera $17.73

Safety CCTV Camera F1.2 4mm Monofocal Manual Iris Lens $7.60

2.8mm CCTV Monofocal Manual Iris CS Mount Lens / Replacement Lens $7.99

4.0mm CCTV Monofocal Manual Iris CS Mount Lens / Replacement Lens $6.49

6.0mm CCTV Monofocal Manual Iris CS Mount Lens / Replacement Lens $6.49

8.0mm CCTV Monofocal Manual Iris CS Mount Lens / Replacement Lens $6.49

12.0mm CCTV Monofocal Manual Iris CS Mount Lens / Replacement Lens $6.49

16.0mm CCTV Monofocal Manual Iris CS Mount Lens / Replacement Lens $6.49

35mm CS Mount Manual IRIS Lens for CCTV Video Security Camera $29.80

5- 100MM 100 MM CCTV Lens manual -Iris Camera CS $88.00

6 - 15 MM CCTV Lens CS manual-Iris Vari-Focal w/Lock $14.95

50 mm 50MM CCTV Camera manual- Iris Lens, 5M Pixel 2/3" $88.99

5 - 50 MM 50MM manual-Iris Varifocal CCTV camera Lens $59.90

CCTV Replacement 12mm F1.2 CS Manual IR Fixed Iris Lens $6.94

Replacement 4mm CCTV Camera Monofocal Manual Iris Lens $8.16

1 Pcs 5-50mm Manual Zoom Auto-Iris Lens U2S $30.00

Any 4Pcs 4,6,8,12,16mm Manual IRIS CCTV Lens True F1.2 U2S $16.00

1/3" Image Format Black 4-9mm Manual IR Iris Lens $15.31