Find The Latest Focus Lens Information You"re Looking For Below
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 Nikon F Lens to Canon EOS EF Mount Adapter Ring NEW  US $11.99
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 Sigma FISHEYE EX 15 mm F 28 Lens CANON mount US $400.00
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 Vivitar 70 210 f45 f56 macro focus zoom Pentax Universal screw mount US $40.00
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 Leica Summilux M 35 14 ASPH 6 Bit Boxed E46 for M9 M8 M7 M6 US $5,698.00
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 Canon FD 100mm f 4 Macro Lens w FD 50 Extention Tube US $175.00
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 Sigma DL 100 mm 300 mm F 45 67 Lens For Minolta US $8.50
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Nikon F Lens to Canon EOS EF Mount Adapter Ring NEW US $11.99
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Sigma FISHEYE EX 15 mm F 28 Lens CANON mount US $400.00
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Vivitar 70 210 f45 f56 macro focus zoom Pentax Universal screw mount US $40.00
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Leica Summilux M 35 14 ASPH 6 Bit Boxed E46 for M9 M8 M7 M6 US $5,698.00
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Canon FD 100mm f 4 Macro Lens w FD 50 Extention Tube US $175.00
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Sigma DL 100 mm 300 mm F 45 67 Lens For Minolta US $8.50
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 58mm 043x WIDE ANGLE SERIES 1 MACRO FOR CANON 18 55mm US $59.95
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 Schneider Retina Xenar 50mm F28 Retina Reflex III IIIS US $49.99
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 Olympus OM Zuiko Auto S 40mm f 2 Lens US $705.00
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 Canon FD 80 200mm f 4 L lens US $350.00
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 Contax Zeiss Vario Sonnar T 35 70mm F 34 Lens US $405.00
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 White Balance Digital 67mm Camera Lens Cap Convert Ring US $6.89
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 CANON FD Lens to NIKON SLR Mount Adapter Ring 2 Caps US $29.05
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 Nikon AF AI lens to Canon EOS EF 550D 60D Mount Adapter US $11.99
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 PRECISION OPTICS MACRO ZOOM 118 125mm 75mm C MOUNT LENS US $67.00
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 M39 lens to Canon EOS 60D 600D 550D 7D Mount adapter US $6.50
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 Canon EF 24mm f 28 Auto Focus Wide Angle Lens USA 2506A002 US $356.00
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 MINOLTA MD REFLEX 500mm 1 8 Lens Ex 9 10 US $1,199.95
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 58mm 28pc EOS XTi XSi XS 30D 40D 50D 5D 7D 450D kit US $36.99
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 58mm 28Pc Lens Camera Filters Kit 4 Canon EOS Rebel ALL US $36.99
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 58mm 28pc camera lens filter kit for Canon EOS Rebel XS US $36.99
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 58mm 28Pc Filter 4 Canon Digital Rebel XTiXSiT1i T2i US $36.99
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 58mm 28pc lens Filter kit 4 CANON REBEL T1i T2i camera US $36.99
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 58mm 28pc lens Filter kit For Canon EOS Rebel XSi T2i T US $36.99
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 58mm Filter kit 28 Pcs Lens Canon EOS Rebel Nikon NEW US $36.99
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 28PC 58MM FILTER LENS KIT 4 CANON REBEL 550d T2i camera US $36.99
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 58mm 28pcs filter for Canon EOS 450D 40D 30D 20D 1000D US $36.99
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 Sigma Sony Ex 14mm F 28 Mint US $899.95
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 KERN PAILLARD PIZAR 115 25mm C MOUNT LENS BOLEX or 4 3 US $100.99
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 Canon EF 400mm f 56L USM Super Telephoto Lens US $1,549.00
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 52mm 52 mm Circular Polarizing C PL CPL Lens Filter Cleaning Pen US $7.99
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 WIDE ANGLE 5X LENS 37mm FOR SONY HDR XR500VHDR XR520V US $23.95
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 WIDE ANGLE 05X LENS 37mm FOR Canon VIXIA HF20HF200 US $23.95
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 WIDE ANGLE 05X LENS 37mm FOR Panasonic PV GS120GS150 US $23.95
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 05X 37mm Wide Angle Macro Conversion Lens for Camera Camcorders US $23.95
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 WIDE ANGLE 05X LENS 37mm FOR Panasonic PV GS180GS320 US $23.95
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 M42 lens to Olympus 4 3 OM adapter Ring focus infinite US $3.25
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 Canon EF IS USM 70 mm 300 mm F 40 56 Lens For US $619.99
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 Tokina Macro 100 F28 D AT X Pro Nikon US $344.00
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why is it important to find good focus using 40x objective lens before you go to oil?
What are some serious consequences if you fail to do so?
You need to position the stage to center your object of interest in the field of view. Then it will still be approximately centered when you switch to the oil objective.
If you first focus with the 40x objective you will be almost in focus when you switch to the oil objective.
You need to use a microscope to properly understand this.